the displacement is 50 km to the east because it is the shortest distance between the initial and final position. However, the total distance traveled is 150 km.
6. For an object moving with a constant velocity, the distance traveled during equal time intervals is the same. It means that the object covers the same distance after every fixed interval of time. 7. For an object moving with a non-constant velocity, the distance traveled during equal time intervals varies.
It means that the object does not cover the same distance after every fixed interval of time. 8. The speed of running 100 meters in 15 seconds can be found by dividing the distance by the time taken:Speed = Distance / Time= 100 / 15= 6.67 m/s.9. To calculate the speed of running 3000 meters east in 21 minutes in km/min, we need to convert the distance to km and the time to minutes:
Speed = Distance / Time= (3000 m / 1000) / (21 min / 60)= 0.238 km/min. 10. Speed is the rate of change of distance while velocity is the rate of change of displacement. Displacement is the shortest distance between the initial and final position of an object in a particular direction. For example, if a car moves 100 km to the east and then turns back and moves 50 km to the west,
the displacement is 50 km to the east because it is the shortest distance between the initial and final position. However, the total distance traveled is 150 km.
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A 3.0 kg puck slides on frictionless surface at 0.40 m/s and strikes a 4.0 kg puck at rest. The first puck moves off at 0.30 m/s at an angle +35 degrees from the incident direction. What is the velocity of the 4.0 kg puck after the impact?
After the impact, the 4.0 kg puck acquires a velocity of approximately 0.75 m/s in the opposite direction of the incident puck's original motion.
To solve this problem, we can apply the law of conservation of momentum, which states that the total momentum before the collision is equal to the total momentum after the collision. The momentum of an object is calculated by multiplying its mass by its velocity.
Before the collision, the total momentum is given by:
Initial momentum = (mass of first puck * velocity of first puck) + (mass of second puck * velocity of second puck)
= (3.0 kg * 0.40 m/s) + (4.0 kg * 0 m/s) [since the second puck is initially at rest]
= 1.2 kg m/s
After the collision, the total momentum is given by:
Final momentum = (mass of first puck * velocity of first puck after collision) + (mass of second puck * velocity of second puck after collision)
= (3.0 kg * 0.30 m/s * cos(35 degrees)) + (4.0 kg * velocity of second puck after collision)
Since the first puck moves off at an angle, we need to use the cosine of the angle to calculate the horizontal component of its velocity.
Solving the equation, we find that the velocity of the 4.0 kg puck after the impact is approximately 0.75 m/s.
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(b) Two charged concentric spherical shells have radi 5.0 cm and 10 cm. The charge on the inner shell is 5.0 ng, and that on the outer shell is-20 nC. In order to calculate the electric field at a distance of 20 cm from the centre of the spheres, an appropriate Gaussian surface is A sphere with a radius of 20 cm A sphere with a radius of 10 cm a A cylinder with a radius of 20 cm A sphere with a radius of 70 cm (1) The total enclosed charge is 3.0 nc 70 nc -20 nc 5.0 nc (i) Calculate the electric field in Newtons per Coulomb at 20 cm
Answer: the electric field at a distance of 20 cm from the center of the spheres is 1.8 × 10^3 N/C.
The appropriate Gaussian surface to calculate the electric field at a distance of 20 cm from the center of the spheres is a sphere with a radius of 20 cm.
(1) The total enclosed charge is -20 nC + 5.0 ng. The total enclosed charge is
-20 nC + 5.0 ng =
-20 × 10^-9 C + 5.0 × 10^-9 C
= -15.0 × 10^-9 C.
(i) The electric field in Newtons per Coulomb at 20 cm. The electric field in N/C at a point at a distance r from the center of a spherical shell of radius R and charge q is given by the equation
E = {q(r)/4πε₀r³}.
E = Electric field in N/Cq. (r) = Total charge enclosed within the Gaussian surface which is -15.0 × 10^-9 C. ε₀ = Permittivity of free space = 8.854 × 10^-12 C²/N.m². r = distance from the center of the shell where the electric field is being calculated = 20 cm = 0.20 m.
For r > R₂, the electric field at a point outside a shell of charge q and radius R₂ is zero.
Hence, only the electric field due to the 5.0 cm inner shell will be considered. E = {q(r)/4πε₀r³}E = {5.0 × 10^-9 C/4π(8.854 × 10^-12 C²/N.m²)(0.20 m)³}E = 1.8 × 10^3 N/C.
Therefore, the electric field at a distance of 20 cm from the center of the spheres is 1.8 × 10^3 N/C.
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Part C
Now, to get numerical equations for x and y, you’ll need to know the initial values (at time t = 0) for some velocities and accelerations. On the Table below the video:
Select cm as the mass measurement set to display.
Click the Table label and check all x and y displacement and velocity data: x, y, vx, and vy. Then click Close.
Now rewrite the displacement equations from Part A and Part B above by substituting in the x and y velocity values from time t = 0 and also using the theoretical value of acceleration of gravity. Write them out below.
To rewrite the displacement equations from Part A and Part B, we'll substitute in the x and y velocity values from time t = 0 and use the theoretical value of acceleration due to gravity.
Displacement equations for x-axis (horizontal motion):
1. x = (vx)t
where vx is the initial velocity in the x-direction.
Displacement equation for y-axis (vertical motion):
1. y = (vy)t + (1/2)(g)(t^2)
where vy is the initial velocity in the y-direction and g is the acceleration due to gravity.
1. Start by selecting cm as the mass measurement set to display.
2. Click on the Table label and check all x and y displacement and velocity data: x, y, vx, and vy.
3. Click Close to save the changes.
4. Now, let's rewrite the displacement equations using the given values.
- For the x-axis displacement, substitute the initial x-velocity value (vx) at time t = 0 into the equation: x = (vx)t.
- For the y-axis displacement, substitute the initial y-velocity value (vy) at time t = 0 and the acceleration due to gravity (g) into the equation: y = (vy)t + (1/2)[tex](g)(t^2[/tex]).
Please note that the specific values for vx, vy, and g should be provided in the question or the given table. Make sure to substitute the correct values to obtain the numerical equations for x and y displacement.
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An object is placed 45 cm to the left of a converging lens of focal length with a magnitude of 25 cm. Then a diverging lens of focal length of magnitude 15 cm is placed 35 cm to the right of this lens. Where does the final image form for this combination? Please give answer in cm Real or virtual?
Location of the final image: 27.38 cm to the right of the lens combination
Nature of the final image: Real. To determine the location and nature of the final image formed by the combination of the lenses, we can use the lens formula and the concept of lens combinations.
The lens formula for a single lens is given by:
1/f = 1/do + 1/di
Where:
f = focal length of the lens
do = object distance from the lens
di = image distance from the lens
For the converging lens:
f1 = 25 cm
do1 = -45 cm (since the object is placed to the left of the lens)
Using the lens formula for the converging lens:
1/25 = 1/-45 + 1/di1
Simplifying the equation, we find the image distance di1 for the converging lens:
di1 = 16.67 cm
Now, we consider the diverging lens:
f2 = -15 cm (since it is a diverging lens)
do2 = 35 cm (the object distance from the diverging lens)
Using the lens formula for the diverging lens:
1/-15 = 1/35 + 1/di2
Simplifying the equation, we find the image distance di2 for the diverging lens:
di2 = -10.71 cm
To find the final image distance, we need to consider the combination of the lenses. Since the diverging lens has a negative focal length, we consider it as a virtual object for the converging lens.
The final image distance di_final is given by:
di_final = di1 - do2
di_final = 16.67 - (-10.71)
di_final = 27.38 cm
Since the final image distance is positive, the image is real and formed on the same side as the object. Therefore, the final image forms 27.38 cm to the right of the lens combination.
The answer is:
Location of the final image: 27.38 cm to the right of the lens combination
Nature of the final image: Real
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Thin Lenses: A concave lens will O focalize light rays O reticulate light rays diverge light rays converge light rays
A concave lens will diverge light rays.
A concave lens is a thin lens that is thinner at the center than at the edges. When light rays pass through a concave lens, they are refracted or bent away from the principal axis of the lens. This bending of light causes the light rays to diverge or spread apart.
Unlike a convex lens, which converges light rays to a focal point, a concave lens disperses light rays. The diverging effect of a concave lens is due to the fact that the center of the lens is thinner than the edges, causing the light rays to bend away from each other.
This phenomenon is known as negative or diverging refraction. As a result, parallel light rays passing through a concave lens will spread out and appear to originate from a virtual point on the same side of the lens as the object. This point is called the virtual focal point.
The ability of a concave lens to diverge light rays makes it useful in correcting certain vision problems. For example, concave lenses are commonly used to correct nearsightedness (myopia), where the light rays converge before reaching the retina.
By adding a concave lens in front of the eye, the light rays are spread out, allowing them to focus properly on the retina.
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A
current of 5A passes along the axis of a cylinder of 5cm radius.
What is the flux density at the surface of the cylinder?
A current of 5A passes along the axis of a cylinder of 5cm radius. The flux density at the surface of the cylinder is 2 × 10^-6 Tesla (T).
To calculate the flux density at the surface of the cylinder, we can use Ampere's law, which relates the magnetic field generated by a current-carrying conductor to the current passing through it.
The formula for the magnetic field generated by a current-carrying wire at a radial distance from the wire is given by:
B = (μ₀ × I) / (2π × r)
Where:
B is the magnetic field (flux density)
μ₀ is the permeability of free space (4π × 10^-7 T·m/A)
I is the current passing through the wire
r is the radial distance from the wire
In this case, the current passing through the cylinder is 5 A, and we want to calculate the flux density at the surface of the cylinder, which has a radius of 5 cm (0.05 m).
Plugging the values into the formula, we get:
B = (4π × 10^-7 T·m/A × 5 A) / (2π × 0.05 m)
Simplifying the expression:
B = (2 × 10^-7 T·m) / (0.1 m)
B = 2 × 10^-6 T
Therefore, the flux density at the surface of the cylinder is 2 × 10^-6 Tesla (T).
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Determine which of the following arguments about the magnetic field of an iron-core solenoid are not always true.
a. Increase I, increase B
b. Decrease I, decrease B
c. B = 0 when I = 0
d. Change the direction of I, change the direction of B
Of the following arguments about the magnetic field of an iron-core solenoid are not always true. the arguments c and d are not always true
The arguments about the magnetic field of an iron-core solenoid that are not always true are c. "B = 0 when I = 0" and d. "Change the direction of I, change the direction of B."
c. While it is true that the magnetic field (B) of an iron-core solenoid is proportional to the current (I) passing through it, it does not necessarily mean that the field becomes zero when the current is zero. This is because the iron core in the solenoid can retain some magnetization, even when the current is zero. This residual magnetization in the iron core can contribute to a nonzero magnetic field.
d. The direction of the magnetic field (B) inside the solenoid depends on the direction of the current (I) flowing through it, according to the right-hand rule. However, changing the direction of the current does not always result in an immediate change in the direction of the magnetic field. This is because the magnetic field inside the iron core of the solenoid takes some time to adjust to the new current direction due to the magnetic properties of the iron core. Therefore, there may be a brief delay before the magnetic field aligns with the new current direction.
In summary, the arguments c and d are not always true for an iron-core solenoid due to the presence of residual magnetization in the core and the time delay in changing the direction of the magnetic field when the current direction changes.
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A transformer is used to step down 160 V from a wall socket to 9.1 V for a radio. (a) If the primary winding has 600 turns, how many turns does the secondary winding have?_____ turns (b) If the radio operates at a current of 480 mA, what is the current (in mA) through the primary winding? ____mA
(a) If the primary winding has 600 turns, how many turns does the secondary winding have? 34 turns (b) If the radio operates at a current of 480 mA, what is the current (in mA) through the primary winding? 27.2 mA.
(a) Given that the primary winding has 600 turns and the voltage across the primary winding is 160 V, and the voltage across the secondary winding is 9.1 V, we can calculate the number of turns in the secondary winding (N2) as follows: Picture is given below.
Therefore, the secondary winding has approximately 34 turns.
(b)To find the current through the primary winding, we can use the current ratio equation:
[tex]\frac{I1}{I2}[/tex] = [tex]\frac{N2}{N1}[/tex]
where I1 and I2 re the currents through the primary and secondary windings respectively, and N1 and N2are the number of turns in the primary and secondary windings respectively.
Given that the current through the secondary winding (I2) is 480 mA, and the number of turns in the primary winding (N1) is 600, we can calculate the current through the primary winding (I1) as follows: Picture is given below.
Therefore, the current through the primary winding is approximately 27.2 mA.
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A wheel rotates with a constant angular acceleration of 3.50rad/s 2
. A) If the angular speed of the wheel is 2.00rad/s at t i
=0, through what angular displacement does the wheel rotate in 2.00 s ? B) What is the angular speed of the wheel at t=2.00 s ?
A wheel has a constant angular acceleration of 3.50 rad/s². The wheel rotates through an angular displacement of 8.00 radians in 2.00 seconds. The angular speed is ω = 8.00 rad/s.
A) To calculate the angular displacement of the wheel in 2.00 seconds, we can use the formula θ = ωi * t + (1/2) * α * t², where θ is the angular displacement, ωi is the initial angular speed, α is the angular acceleration, and t is the time. Substituting the given values into the formula, we have θ = (2.00 rad/s) * (2.00 s) + (1/2) * (3.50 rad/s²) * (2.00 s)². Evaluating this expression gives θ = 8.00 rad. Therefore, the wheel rotates through an angular displacement of 8.00 radians in 2.00 seconds.
B) To find the angular speed of the wheel at t = 2.00 seconds, we can use the formula ω = ωi + α * t, where ω is the angular speed at a given time. Substituting the values into the formula, we have ω = (2.00 rad/s) + (3.50 rad/s²) * (2.00 s). Calculating this expression gives ω = 8.00 rad/s.
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A 1.60-m long steel piano wire has a diameter of 0.20 cm. What is the needed tension force in the wire for it to stretch at a length of 0.25 cm? (Continuation) What is the amount of force that could break this wire? The ultimate strength of steel is 500 x10 Pa. What is the elongation length of the wire the moment it breaks?
To calculate the tension force required to stretch a steel piano wire, we can use Hooke's Law and the formula for the cross-sectional area of a wire. The force that could break the wire can be determined using the ultimate strength of steel. The elongation length of the wire at the moment it breaks can be found using the equation for strain.
To find the tension force required to stretch the piano wire by a certain length, we can use Hooke's Law, which states that the force applied to a spring or elastic material is proportional to the displacement or change in length. The formula for Hooke's Law is F = kΔL, where F is the tension force, k is the spring constant (related to the wire's Young's modulus and cross-sectional area), and ΔL is the change in length.
First, we need to find the cross-sectional area of the wire using its diameter. The formula for the area of a circle is A = πr², where r is the radius. In this case, the diameter is given, so we can divide it by 2 to find the radius.
Once we have the cross-sectional area, we can calculate the spring constant using Young's modulus, which is a property of the material. The spring constant is given by k = (YA) / L, where Y is the Young's modulus, A is the cross-sectional area, and L is the original length of the wire.
To calculate the force that could break the wire, we use the ultimate strength of steel, which is a measure of the maximum stress a material can withstand without breaking. The force is given by F_break = A * ultimate strength.
Finally, to find the elongation length at the moment the wire breaks, we can use the equation for strain: ΔL / L = F_break / (A * Y), where ΔL is the elongation length, L is the original length, F_break is the force that could break the wire, A is the cross-sectional area, and Y is the Young's modulus.
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The Brackett series in the hydrogen emission spectrum is formed by electron transitions from ni > 4 to nf = 4.
What is the longest wavelength in the Brackett series?
...nm
What is the wavelength of the series limit (the lower bound of the wavelengths in the series)?
...nm
Therefore, for the longest wavelength in the Brackett series, ni > 4 and nf = 4. Hence, the largest value of n that can be used in the above equation is 5. Substituting this in the above equation gives:1/λ = RH [ (1/22²) - (1/5²) ] ⇒ λ = 2.166 x 10⁻⁶ m..
The longest wavelength in the Brackett series of the hydrogen emission spectrum is 2.166 × 10⁻⁶ m.The shortest wavelength in the Brackett series of the hydrogen emission spectrum is 4.05 × 10⁻⁷ m. Hence, the wavelength of the series limit (the lower bound of the wavelengths in the series) is 4.05 × 10⁻⁷ m.How to arrive at the above answer:The wavelengths in the Brackett series can be given by the following equation: 1/λ = RH [ (1/22²) - (1/n²) ], where λ is the wavelength of the emitted photon, RH is the Rydberg constant (1.097 x 10⁷ /m), and n is the principal quantum number of the electron in the initial state. Therefore, for the longest wavelength in the Brackett series, ni > 4 and nf = 4. Hence, the largest value of n that can be used in the above equation is 5. Substituting this in the above equation gives:1/λ = RH [ (1/22²) - (1/5²) ] ⇒ λ = 2.166 x 10⁻⁶ m. Similarly, for the wavelength of the series limit, the value of n that can be used in the above equation is infinity (since the electron can ionize). Substituting this in the above equation gives:1/λ = RH [ (1/22²) - (0) ] ⇒ λ = 4.05 x 10⁻⁷ m.
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During the transient analysis of an RLC circuit, if the response is V(s) = (16s-20)/(s+1)(s+5), it is:
A. Step response of a series RLC circuit
B. Natural response of a parallel RLC circuit
C. Natural response of a series RLC circuit
D. None of the other choices are correct
E. Step response of a parallel RLC circuit
The response V(s) = (16s-20)/(s+1)(s+5) belongs to natural response of a series RLC circuit. Therefore, option C is correct.
Explanation:
The response V(s) = (16s-20)/(s+1)(s+5) belongs to natural response of a series RLC circuit.
In an RLC circuit, the transient analysis relates to the study of circuit responses during time transitions before attaining the steady state. Here, the response of the circuit to a step input or impulse input is analyzed, which is known as step response or natural response.
The natural response of a circuit depends upon the initial conditions, which means it is an undamped oscillation.
The response V(s) = (16s-20)/(s+1)(s+5) does not belong to the step response of a series RLC circuit, nor the natural response of a parallel RLC circuit.
Therefore, option C is correct.
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The output power of a 400/690 V, 50 Hz, Y-connected induction motor, shown below, is 15 kW. It runs at full load with a speed of 2940 RPM. Choose the correct statement: The motor's synchronous speed is 3000 RPM and its rated power is 30 HP. O The motor's synchronous speed is 2500 RPM at 50 Hz. O The motor has 2 poles and operates at a slip of 6%. o The motor torque at full load is 48.4 Nm O The motor has 4 poles and operates at a slip of 2%.
The correct statement is that the motor has 4 poles and operates at a slip of 2%. and the motor torque at full load is 48.4 Nm
Synchronous speed of induction motor The synchronous speed (N_s) of an induction motor is calculated using the below formula: N_s = (f/P) × 120 where, f is the frequency of the power supply applied P is the number of poles in the motor
From the above formula, we get the synchronous speed of the motor = (50/2) × 120 = 3000 RPM
The motor operates at a slip of 2%.
The speed of the motor is given by, Speed of motor (N) = Synchronous speed – Slip speed where Slip speed = (Slip × Synchronous speed) / 100
Now, Speed of motor (N) = 3000 – (2% × 3000) = 2940 RPM
Therefore, the motor has 4 poles. The rated power of the motor is given as 15 kW, which is equal to 20 HP (1 HP = 0.746 kW).
So, the motor's rated power is 20 HP.
The formula for calculating the motor torque is given by the below formula, T = (P × 60) / (2 × π × N) Where, P = Output power of the motor
N = Speed of the motor
Substituting the values we get, T = (15 × 60) / (2 × π × 2940) = 48.4 Nm
Therefore, the motor torque at full load is 48.4 Nm.
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The complete question is -
The output power of a 400/690 V, 50 Hz, Y-connected induction motor, shown below, is 15 kW. It runs at full load with a speed of 2940 RPM. Choose the correct statement:
o The motor's synchronous speed is 3000 RPM and its rated power is 30 HP.
O The motor torque at full load is 48.4 Nm O The motor has 4 poles and operates at a slip of 2%.
O The motor has 2 poles and operates at a slip of 6%.
O The motor's synchronous speed is 2500 RPM at 50 Hz.
Describe the three types of possible Universes we could live in and what will happen to them in the end. In your description, include the value of the cosmological density parameter and the size of the Universe in each case.
There are three types of possible universes based on the value of the cosmological density parameter. In a closed universe (Ω > 1), In an open universe (Ω < 1) & In a flat universe (Ω = 1).
The cosmological density parameter (Ω) represents the ratio of the actual density of matter and energy in the universe to the critical density required for the universe to be flat.
In a closed universe (Ω > 1), the density of matter and energy is high enough for the universe's gravitational pull to eventually overcome the expansion, leading to a collapse.
In an open universe (Ω < 1), the density of matter and energy is below the critical value, resulting in a universe that continues to expand indefinitely.
In a flat universe (Ω = 1), the density of matter and energy precisely balances the critical density, leading to a universe that expands at a gradually slowing rate.
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Your friend is a new driver in your car practicing in an empty parking lot. She is driving clockwise in a large circle at a constan speed. Is the car traveling with a constant velocity or is it accelerating?: Since the car is changing direction as it travels around the circle, it has a centripetal acceleration and does not have a constant velocity. The car has a constant speed, so the velocity is constant and there is no acceleration.
Centripetal acceleration, which points towards the center of the circle, is responsible for this change in direction. Thus, while the car is traveling at a constant speed, it is still accelerating since the direction of its velocity is constantly changing.
The car has a centripetal acceleration and does not have a constant velocity. Although the car is traveling with a constant speed, it is still accelerating.What is acceleration?Acceleration refers to the rate of change of velocity. Acceleration may be either positive or negative. When an object speeds up, it has positive acceleration.
When an object slows down, it has negative acceleration, which is also known as deceleration. When an object changes direction, it experiences acceleration.A car driving in a circle at a constant speed is an example of uniform circular motion.
The car's direction is constantly changing since it is moving in a circular path. As a result, the car's velocity is constantly changing even if its speed is constant.
Centripetal acceleration, which points towards the center of the circle, is responsible for this change in direction.
Thus, while the car is traveling at a constant speed, it is still accelerating since the direction of its velocity is constantly changing.
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A single-slit diffraction pattern is formed when light of λ = 740.0 nm is passed through a narrow slit. The pattern is viewed on a screen placed one meter from the slit. What is the width of the slit (mm) if the width of the central maximum is 2.25 cm?
The width of the slit can be calculated by using the formula for single-slit diffraction. In this case, the width of the central maximum is given as 2.25 cm, and the wavelength of the light is 740.0 nm. The width of the slit is 0.7400 * 10^-3 mm.
By substituting these values into the formula, the width of the slit can be determined.
The single-slit diffraction pattern can be characterized by the equation:
sin(θ) = m * λ / w
where θ is the angle of diffraction, m is the order of the maximum (for the central maximum, m = 0), λ is the wavelength of the light, and w is the width of the slit.
In this case, the width of the central maximum is given as 2.25 cm. To convert this to meters, we divide by 100: 2.25 cm = 0.0225 m. The wavelength of the light is given as 740.0 nm, which is already in meters.
For the central maximum (m = 0), the angle of diffraction is zero. Therefore, sin(θ) = 0, and the equation becomes:
0 = 0 * λ / w
Simplifying the equation, we find that the width of the slit is equal to the wavelength:
w = λ
Substituting the given wavelength, we have:
w = 740.0 nm = 0.7400 μm = 0.7400 * 10^-3 mm
Therefore, the width of the slit is 0.7400 * 10^-3 mm.
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magnetic field (wider than 10 cm ) with a strength of 0.5 T pointing into the page. Finally it leaves the field. While entering the field what is the direction of the induced current as seen from above the plane of the page? clockwise counterclockwise zero While in the middle of the field what is the direction of the induced current as seen from above the plane of the page? clockwise counterclockwise zero While leaving the field what is the direction of the induced current as seen from above the plane of the page? clockwise counterclockwise zero
When a conductor enters a magnetic field, the direction of the induced current can be determined using Fleming's right-hand rule. As seen from above the plane of the page, the direction of the induced current while entering the field is counterclockwise. While in the middle of the field, the induced current is zero, and while leaving the field, the direction of the induced current is clockwise.
Fleming's right-hand rule is a way to determine the direction of the induced current in a conductor when it is moving in a magnetic field. According to this rule, if the thumb of the right hand points in the direction of the motion of the conductor, and the fingers point in the direction of the magnetic field, then the direction in which the palm faces represents the direction of the induced current.
When the conductor enters the magnetic field, the motion of the conductor is from left to right (as seen from above the plane of the page), and the magnetic field is pointing into the page. Using Fleming's right-hand rule, if we point the thumb of the right hand in the direction of the motion (left to right) and the fingers into the page (opposite to the magnetic field), the palm will face counterclockwise. Therefore, the direction of the induced current while entering the field is counterclockwise.
While in the middle of the field, the conductor is moving parallel to the magnetic field, resulting in no change in the magnetic flux through the conductor. Therefore, there is no induced current during this phase.
When the conductor leaves the magnetic field, the motion of the conductor is from right to left (as seen from above the plane of the page), and the magnetic field is pointing into the page. Applying Fleming's right-hand rule, if we point the thumb in the direction of the motion (right to left) and the fingers into the page (opposite to the magnetic field), the palm will face clockwise. Hence, the direction of the induced current while leaving the field is clockwise.
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A 250-12 resistor, an uncharged capacitor, and a 4.00-V emf are connected in series. The time constant is 2.80 ms. Part A - Determine the capacitance. Express your answer to three significant figures. Determine the voltage across the capacitor after one time constant. Express your answer to three significant figures. Determine the time it takes for the voltage across the resistor to become 1.00 V. Express your answer to three significant figures.
(a) capacitance is 1.12 × 10⁻⁵ F
(b) After one time constant has elapsed, the voltage across the capacitor (Vc) is 2.32 V
(c) the time taken for the voltage across the resistor to become 1.00 V is about 3.91 ms.
The question concerns the calculation of capacitance, voltage across a capacitor, and time taken for voltage across a resistor to reach 1.00 V under specified conditions.
In an RC circuit consisting of a 250-Ω resistor, an uncharged capacitor, and a 4.00 V emf connected in series, the time constant is 2.80 ms.
(a) The formula for the time constant of a circuit is:
τ=RC
Where τ is the time constant, R is the resistance of the circuit, and C is the capacitance of the capacitor. Rearranging, we have:
C= τ/R
We are given R = 250 Ω and τ = 2.80 ms = 2.80 × 10⁻³ s. Thus,
C = 2.80 × 10⁻³ s / 250 Ω = 1.12 × 10⁻⁵ F(rounding to three significant figures).
(b) After one time constant has elapsed, the voltage across the capacitor (Vc) is given by the formula:
Vc = emf(1 - e^(-t/τ))
where t is the time taken, emf is the electromotive force (voltage) of the circuit, and e is the mathematical constant e (≈ 2.718).
We are given emf = 4.00 V and τ = 2.80 ms = 2.80 × 10⁻³ s. After one time constant has elapsed, t = τ = 2.80 × 10⁻³ s.
Thus,
Vc = 4.00 V[tex](1 - e^{(-2.80 * 10^{-3} s / 2.80 * 10^{-3} s)})[/tex]
= 4.00 V[tex](1 - e^{(-1)})[/tex]
≈ 2.32 V(rounding to three significant figures).
(c) The voltage across the resistor (Vr) after time t is given by:
Vr = [tex]emf(e^{(-t/τ))}[/tex]
We want to know the time taken for Vr to become 1.00 V, so we set Vr equal to 1.00 V and solve for t:
Vr = emf[tex](e^{(-t/τ))}[/tex]
1.00 V = 4.00 V[tex](e^{(-t/2.80 * 10^{-3] s))}[/tex]
[tex]e^{(-t/2.80 × 10⁻³ s)}[/tex] = 0.25t/τ = ln(0.25)/(-1) ≈ 1.39τt = 1.39τ ≈ 3.91 × 10⁻³ s(rounding to three significant figures).
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What is the time constant? s (b) How long will it take to reduce the voltage on the capacitor to 0.100% of its full value once discharge begins? s (c) If the capacitor is charged to a voltage V 0
through a 133Ω resistance, calculate the time it takes to rise to 0.865V 0
(this is about two time constants). S
Therefore, it takes approximately 26.4 seconds to rise to 0.865V0.
Time ConstantIt is the time required by an electric circuit or system to change its state from an initial state to its final state after an abrupt change in one of its variables. The transient response of the circuit or system is characterized by the time constant.
The formula for the time constant in seconds is given by the product of the resistance and the capacitance, i.e.,T=RC(a) To determine the time it takes for the capacitor to discharge to 0.100% of its full value after discharge begins.
Given, V=100% and V'=0.100%It is known that the equation for the capacitor voltage with time during discharge is given by;V = V0e-t/RCSubstituting for the final and initial voltages we have,0.100% V0 = V0e-t/RC
Taking the natural logarithm of both sides,ln(0.001) = -t/RCln(0.001) = -t/1.2 x 10^3 x 2.2 x 10^-6t = 31.2 seconds (to the nearest whole number)Therefore, it will take approximately 31.2 seconds to reduce the voltage on the capacitor to 0.100% of its full value once discharge begins.
(c) If the capacitor is charged to a voltage V0 through a 133Ω resistance, calculate the time it takes to rise to 0.865V0 (this is about two time constants).It is known that the equation for the capacitor voltage with time during charging is given by;V = V0(1 - e-t/RC)
We are required to find the time it takes for the voltage across the capacitor to rise to 0.865V0, which is equivalent to a voltage difference of 0.135V0 from the initial voltage.
Therefore, substituting for the final and initial voltages we have,0.865V0 = V0(1 - e-2T/RC)Rearranging,1 - 0.865 = e-2T/RCln(0.135) = -2T/RCt = 2T = 2 x 1.2 x 10^3 x 2.2 x 10^-6 x ln(0.135)t = 26.4 seconds (to the nearest whole number) Therefore, it takes approximately 26.4 seconds to rise to 0.865V0.
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A single-turn square loop carries a current of 16 A. The loop is 15 cm on a side and has a mass of 3.6×10 −2
kg - initially the loop lies flat on a horizontal tabletop. When a horizontal magnetic field is turned on, it is found that only one side of the loop experiences an upward force. Part A Find the minimum magnetic field, B min
, necessary to start lipping the loop up from the table. Express your answer using two significant figures. Researchers have tracked the head and body movements of several flying insects, including blowllies, hover fles, and honeybees. They attach lightweight, fexible wires to a small metai coli on the insect's head, and another-on its thorax, and then allow it to fly in a stationary magnetic field. As the coils move through the feld, they experience induced emts that can be analyzed by computer to determine the corresponding orientation of the head and thorax. Suppose the fly turns through an angle of 90 in 31 ms. The coll has 89 turns of wire and a diameter of 2.2 mm. The fly is immersed in a magnetic feld of magnitude 0.16 m T. Part A If the magnetic flux through one of the coils on the insect goes from a maximum to zero during this maneuver find the magnitude of the induced emf. Express your answer using two significant figures.
For the loop, the minimum magnetic field required to lift it from the table is approximately 0.24 T.
As for the flying insect, the magnitude of the induced emf in the coil due to a change in magnetic flux is approximately 0.29 mV. For the square loop, we equate the magnetic force with the gravitational force. Magnetic force is given by BIL where B is the magnetic field, I is the current, and L is the length of the side. Gravitational force is mg, where m is mass and g is gravitational acceleration. Setting BIL=mg and solving for B gives us the minimum magnetic field. For the insect, the change in magnetic flux through the coil induces an emf according to Faraday's law, given by ΔΦ/Δt = N*emf, where N is the number of turns and Δt is the time taken. Solving for emf provides the induced voltage.
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The smaller disk dropped onto a larger rotating one. (frame rate=30fps. Frames=36)(time 1.2 s). The large disk is made of dense plywood rotating on a low-friction bearing. The masses of the disks are: large disk: 2.85kg Radius of large disk = 0.3m small disk: 3.06 kg Radius of small disk= 0.18m
(1) Make measurements and calculations to determine the final speed of the two disk rotating together, and calculate the percent difference between your predicted value and the experimental value. Hint: The final velocity of the two-disk system should be measured when the two disks reach the same angular velocity. How can you tell when that happens?
(2) Determine the total angular momentum of the two-disk system after the smaller disk is dropped on the larger one. Calculate the percent difference: percent change=((L sys−L sys)/L sys)×100
(3) Determine the total kinetic energy of the two-disk system before and after the collision. Calculate the percent difference between the two values.
(4) Compare the percent change in angular momentum of the system to the percent change in the rotational kinetic energy of the system. Explain the difference between these two values.
The final speed of the two-disk system can be determined by equating the angular momentum before and after the collision. The total angular of the two-disk system after the smaller disk is dropped on the larger one is the sum of the individual angular momenta of the disks.
(1) The angular momentum is given by the product of the moment of inertia and the angular velocity. Since the system is initially at rest, the initial angular momentum is zero. When the two disks reach the same angular velocity, the final angular momentum is given by the sum of the individual angular momenta of the disks. By equating these two values, we can solve for the final angular velocity. The final linear speed can then be calculated by multiplying the final angular velocity with the radius of the combined disks. To determine when the disks have reached the same angular velocity, one can observe their motion visually and note when they appear to be rotating together smoothly.
(2) The angular momentum of a disk is given by the product of its moment of inertia and angular velocity. By adding the angular momenta of the large and small disks, we can calculate the total angular momentum of the system. The percent difference can be calculated by comparing this value to the initial angular momentum, which is zero since the system starts from rest.
(3) The total kinetic energy of the two-disk system before and after the collision can be calculated using the formulas for rotational kinetic energy. The rotational kinetic energy of a disk is given by half the product of its moment of inertia and the square of its angular velocity. By summing the rotational kinetic energies of the large and small disks, we can determine the initial and final kinetic energies of the system. The percent difference can be calculated by comparing these two values.
(4) The percent change in angular momentum of the system and the percent change in the rotational kinetic energy of the system may not be the same. This is because angular momentum depends on both the moment of inertia and the angular velocity, while rotational kinetic energy depends only on the moment of inertia and the square of the angular velocity. Therefore, changes in the angular velocity may not be directly proportional to changes in the rotational kinetic energy. The difference between these two values can arise due to factors such as the redistribution of mass and changes in the system's geometry during the collision.
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A star spans a parallax angle θ = 2 arcsecond when seen on Earth (6 months spans 2θ). Its distance is _____ light years from us.
A star spans a parallax angle θ = 2 arcsecond when seen on Earth (6 months spans 2θ). Its distance is 0.00000954 light years from us.
Parallax is a method used to measure the distance to nearby stars. The distance to the star is 0.00000954 light years, or 9.54 x 10^-6 light years, which was calculated using the parallax angle of 2 arcseconds observed on Earth. The parallax angle θ of a star is related to its distance d from Earth by the equation:
d = 1 / p
where p is the parallax in arcseconds.
In this problem, we are given that the star spans a parallax angle of 2 arcseconds when seen on Earth. Therefore, the distance to the star is:
d = 1 / (2 arcseconds) = 1 / 0.00055556 radians = 1800 radians
To convert this distance to light years, we need to divide by the speed of light, which is approximately 299,792,458 meters per second. Using the fact that there are approximately 31,536,000 seconds in a year, we get:
d = (1800 radians) / (299,792,458 meters/second × 31,536,000 seconds/year)
d = 0.00000954 light years
Therefore, the star is approximately 0.00000954 light years, or 9.54 × 10^-6 light years, away from us.
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(a) Two point charges totaling 8.00μC exert a repulsive force of 0.300 N on one another when separated by 0.567 m. What is the charge ( in μC ) on each? smallest charge xμC μC (b) What is the charge (in μC ) on each if the force is attractive? smallest charge « μC largest charge μC
a)The charge on each particle in both cases is 4.00 μC and b) -1.86 x 10⁻⁶ C, respectively.
(a) Two point charges totaling 8.00μC exert a repulsive force of 0.300 N on one another when separated by 0.567 m. What is the charge (in μC) on each?The force between two point charges q1 and q2 that are separated by distance r is given by:F = (1/4πε) x (q1q2/r²)Here, ε = 8.85 x 10⁻¹² C²/Nm², q1 + q2 = 8.00 μC, F = 0.300 N, and r = 0.567 m.Therefore,F = (1/4πε) x [(q1 + q2)²/r²]0.300 = (1/4πε) x [(8.00 x 10⁻⁶)²/(0.567)²]q1 + q2 = 8.00 μCq1 = (q1 + q2)/2, q2 = (q1 + q2)/2Therefore,q1 = q2 = 4.00 μC.
(b) What is the charge (in μC) on each if the force is attractive?When the force is attractive, the charges are opposite in sign. Let q1 be positive and q2 be negative. The force of attraction is given by:F = (1/4πε) x (q1q2/r²)Therefore,F = (1/4πε) x [(q1 - q2)²/r²]0.300 = (1/4πε) x [(q1 - (-q1))²/(0.567)²]q1 = (0.300 x 4πε x (0.567)²)¹/² = 1.86 x 10⁻⁶ Cq2 = -q1 = -1.86 x 10⁻⁶ C. Thus, the charge on each particle in both cases is 4.00 μC and -1.86 x 10⁻⁶ C, respectively.
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A point particle of mass m moves with the potential V=1/2 kx2. It moves in a single format in the equilibrium position in the range of 0
The motion of the particle is independent of any other external forces acting on it. The differential equation for the motion of a point particle of mass m moving with potential V=1/2kx² is of the form m(d²x/dt²) + kx = 0. The natural angular frequency, ω is given by ω = sqrt(k/m). The solution to the differential equation for the motion of the point particle is given by x = Acos(ωt) + Bsin(ωt) where A and B are constants that can be determined from the initial conditions of the particle. The period of the oscillation is given by T = 2π/ω.
Given, a The differential equation for the motion of a point particle of mass m moving with potential V=1/2kx² is of the form:m(d²x/dt²) + kx = 0As the given potential is symmetrical about the equilibrium position, the motion of the point particle will be in SHM or Simple Harmonic Motion. The natural angular frequency, ω is given by:ω = sqrt(k/m)The particle oscillates in a single format in the equilibrium position, which means it oscillates about the equilibrium position. The amplitude of the oscillation depends on the initial conditions of the particle.
The solution to the differential equation for the motion of the point particle is given by:x = Acos(ωt) + Bsin(ωt)Where A and B are constants that can be determined from the initial conditions of the particle. The solution is a sinusoidal function of time with a frequency equal to the natural frequency ω of the oscillator. The period of the oscillation is given by:T = 2π/ωThe motion of the point particle is entirely determined by the potential V, which in this case is V = 1/2kx². Therefore, the motion of the particle is independent of any other external forces acting on it.
The differential equation for the motion of a point particle of mass m moving with potential V=1/2kx² is of the form m(d²x/dt²) + kx = 0. The natural angular frequency, ω is given by ω = sqrt(k/m). The solution to the differential equation for the motion of the point particle is given by x = Acos(ωt) + Bsin(ωt) where A and B are constants that can be determined from the initial conditions of the particle. The period of the oscillation is given by T = 2π/ω.
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3.A ball of mass 0.8 Kg is dragged in the upward direction on an
inclined plane.Calculate the potential energy gained by this ball
at a height of the wedge of 0.2 meter.
please help. thank u
The potential energy gained by the ball at a height of wedge of 0.2 meter is 1.57 Joules.
What is potential energy?
Potential energy is the energy gained by the object by virtue of it's position or configuration.
For example water water stored in a dam or a bend scale certainly has some potential energy.
The potential energy gained by the ball of mass 0.8 Kg at a height of the wedge of 0.2 meter can be calculated using the formula given below:
Potential energy (P.E) = mass of object x acceleration due to gravity x height of the object
PE= mgh
Here, m = 0.8 kg, g = 9.8 m/s² and h = 0.2 m.
So, substituting these values in the above formula, we get the potential energy gained by the ball at a height of the wedge of 0.2 meter.
PE = 0.8 x 9.8 x 0.2
PE = 1.568 Joules
Therefore, the potential energy gained by the ball of mass 0.8 Kg at a height of the wedge of 0.2 meter is 1.568 Joules.
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You are looking for a mirror that will enable you to see a 3.4-times magaified virtual image of an object that is placed 4.1 em from the mirror's vertex.
Part (a) What kind of mirror will you need? Part (b) What should the mirror's radius of curvature be, in centimeters?
R = _____________
The mirror that you need is concave mirror and the radius of curvature of the concave mirror should be -5.44 cm to get a 3.4 times magnified virtual image.
(a) You will need a concave mirror to see a 3.4-times magnified virtual image of an object placed 4.1 cm away from the mirror's vertex.
(b) The radius of curvature (R) of the mirror can be calculated using the mirror formula for concave mirrors, which is given as:
1/f = 1/v + 1/u
where,
f is the focal length,
v is the image distance,
u is the object distance
The magnification (m) of the mirror is given as:-
m = v/u
Using the above equations, we can calculate the focal length (f) and magnification (m) of the concave mirror, and then use the formula,
R = 2f
u = -4.1 cm (since the object is placed in front of the mirror)
v = -13.94 cm (since the virtual image is formed behind the mirror)
m = -3.4 (since the image is 3.4 times larger than the object, it is magnified)
Using the mirror formula, we get:
1/f = 1/v + 1/u= 1/-13.94 + 1/-4.1= -0.123 + (-0.244)= -0.367
f = -2.72 cm
Using the magnification formula,
-m = v/u
v = -m/u
v = -57.14 cm
Using the formula for radius of curvature,
R = 2f
R = 2(-2.72)
R = -5.44 cm
The radius of curvature of the concave mirror should be -5.44 cm.
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A uniform meterstick balances on a fulcrum placed at the 70.0-cm mark when a weight w is placed at the 90.0- cm mark. What is the weight of the meterstick? a. 0.78w b. 1.0w C. W/2 d. 0.70w e. 0.90w f. 0.22w
The weight of the meterstick is 0.25 W. f. 0.22w.
When a weight w is placed at the 90.0 cm mark, a uniform meterstick balances on a fulcrum placed at the 70.0 cm mark. We need to find the weight of the meterstick. Solution:Let the weight of the meterstick be Wm and its length be Lm.The sum of the torques acting on the meterstick must be zero.τccw - τcw = 0Here, τccw is the torque that the meterstick produces clockwise direction around the fulcrum. τcw is the torque of the weight around the same point.τccw = Fm × Dm and τcw = W × DHere, Fm is the force exerted by the meterstick at its center of mass, Dm is the distance of the center of mass of the meterstick from the fulcrum and D is the distance of the weight from the fulcrum.The torque produced by the meterstick is equal in magnitude to the torque produced by the weight. We get the following equation:Fm × Dm = W × DHere, Dm + D = Lm = 1 m = 100 cm.The fulcrum is placed at the 70.0-cm mark, which is at a distance of 30.0 cm from the end of the meterstick, and the weight is placed at the 90.0-cm mark, which is 10.0 cm away from the fulcrum. We can use this information to solve the above equation as follows:Fm = Wm = W (Since the meterstick is uniform)Dm = 70.0 cm - 30.0 cm = 40.0 cmD = 10.0 cm Substituting these values in the above equation, we get,Wm = W × D / Dm = W × 10.0 cm / 40.0 cm = 0.25 W. The weight of the meterstick is 0.25 W. f. 0.22w.
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A flat coil of wire consisting of 26 turns, each with an area of 43 cm², is placed perpendicular to a uniform magnetic field that increases in magnitude at a constant rate of 2.0 T to 6.0 T in 2.0 s. If the coil has a total resistance of 0.82 ohm, what is the magnitude of the induced current (A)? Give your answer to two decimal places
The magnitude of the induced current in the coil is 126.83 A to two decimal places
Number of turns in the coil: 26turns
Area of each turn: 43 cm²
Magnetic field strength, B1: 2.0 T
New magnetic field strength, B2: 6.0 T
Time, t: 2.0 s
Resistance, R: 0.82 Ω
Formula for the emf induced by Faraday's law of electromagnetic induction is shown below;
emf = -N (dΦ/dt) Where N is the number of turns in the coil, and (dΦ/dt) is the rate of change of the magnetic flux linked with the coil.
The negative sign represents Lenz's law which states that the direction of the induced emf and induced current opposes the change causing it.
Since the coil is flat and perpendicular to the uniform magnetic field, the area vector of each turn in the coil is perpendicular to the magnetic field. Hence, the magnetic flux linked with each turn is given by;
ΦB = B A where A is the area of each turn in the coil, B is the magnetic field strength and the angle between B and A is 90°.
Since there are 26 turns in the coil, the total flux linked with the coil is given by;
ΦB = N Φ
Where N is the number of turns in the coil, and Φ is the flux linked with each turn in the coil.
Substituting for Φ and rearranging the formula for emf above gives;
emf = -N (dΦB/dt)
But B changes at a constant rate from B1 to B2 in time, t. Therefore, the rate of change of the magnetic flux linked with the coil is given by;
(dΦB/dt) = ΔB/Δt
Substituting this value in the formula for emf and rearranging gives;
emf = -N B (Δt)^-1 ΔB
Substituting the given values, the emf induced in the coil is given by;
emf = -26 x 2.0 (2.0)^-1 (6.0 - 2.0) = -104 V
The negative sign indicates that the direction of the induced current is such that it opposes the increase in the magnetic field strength.
The magnitude of the induced current, I can be obtained using Ohm's law;
I = V / R where V is the emf induced and R is the resistance of the coil.
Substituting the given values, the magnitude of the induced current is given by;
I = 104 / 0.82 = 126.83 A
Therefore, the magnitude of the induced current in the coil is 126.83 A to two decimal places.
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At dawn, with the Sun just rising in the east, you face the Sun and bend your head back to look straight up, and you examine the blue sky light with a Polaroid filter. (a) [2 points] Why is the light polarized? (b) (2 points) What is the direction of the electric field, east-west or north-south? Explain briefly why
a. Polarization is caused by the scattering of sunlight off air molecules in the Earth's atmosphere.
b. when you examine the blue sky light with a Polaroid filter, the direction of the electric field is North-South.
a. The electric fields of electromagnetic waves are caused by the vibration of charged particles. A polarized filter is able to block one direction of polarization while allowing the other direction to pass through. This happens because a polarizing filter is made up of a long chain of molecules oriented in one direction, which blocks light waves with electric fields oriented in a perpendicular direction.
The polarization of sunlight is due to the scattering of light off air molecules. This scattering causes light waves with electric fields oriented in a perpendicular direction to the Sun to be polarized. The electric fields of light waves in the blue part of the spectrum are oriented in a north-south direction, while the electric fields of light waves in the red part of the spectrum are oriented in an east-west direction.
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The origins of two frames coincide at t = t' = 0 and the relative speed is 0.996c. Two micrometeorites collide at coordinates x = 101 km and t = 157 μs according to an observer in frame S. What are the (a) spatial and (b) temporal coordinate of the collision according to an observer in frame S’? (a) Number ___________ Units _______________
(b) Number ___________ Units _______________
The origins of two frames coincide at t = t' = 0 and the relative speed is 0.996c.
Two micrometeorites collide at coordinates x = 101 km and t = 157 μs according to an observer in frame S. We need to find the spatial and temporal coordinate of the collision according to an observer in frame S'.
x = 101 km, t = 157 μs
According to the observer in frame S', the relative velocity of frame S with respect to frame S' is u = v = 0.996c.
Let us apply the Lorentz transformation to the given values.
Lorentz transformation of length is given by, L' = L-√(1-u^2/c^2) Here, L = 101 km and u = 0.996c. We know that, c = 3 × 10^8 m/s.
Lorentz transformation of time is given by, T' = T-uX*c^2√(1-u^2/c^2)
Here, T = 157 μs, X = 101 km and u = 0.996c. We know that, c = 3 × 10^8 m/s.
Now, substituting the values in the above equations: L'=33.89 km
Hence, the spatial coordinate of the collision according to an observer in frame S' is 33.89 km.
The temporal coordinate of the collision according to an observer in frame S' is given by, T' = T-uX*c^2√1-u^2*c^2
Substituting the values of T, X and u, we get T' = -92.14μs
Hence, the temporal coordinate of the collision according to an observer in frame S' is -92.14 μs.
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