2. The current 1 remains the same.
In Figure 10-1, the resistor changing to 2.2 ohms would not directly affect the current1. The current1 is determined by the total voltage in the circuit and the overall resistance. If the voltage source and other resistors in the circuit remain unchanged, the current1 would stay the same. The change in resistance only impacts the distribution of current among the resistors but does not alter the total current flowing through the circuit.
The current1 in Figure 10-1 would remain the same if the resistor changes to 2.2 ohms. The current1 is determined by the total voltage and overall resistance in the circuit, and a change in resistance alone does not affect it.
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At a certain instant, the earth, the moon, and a stationary 1470 kg spacecraft lie at the vertices of an equilateral triangle whose sides are km in length.
A. Find the magnitude of the net gravitational force exerted on the spacecraft by the earth and moon.
B. Find the direction of the net gravitational force exerted on the spacecraft by the earth and moon.
C. State the direction as an angle measured from a line connecting the earth and the spacecraft.
D. What is the minimum amount of work that you would have to do to move the spacecraft to a point far from the earth and moon? You can ignore any gravitational effects due to the other planets or the sun.
The magnitude of the net gravitational force exerted on the spacecraft by the Earth and Moon is approximately 4.60 x 10^12 N, and the direction of the net gravitational force is towards the center of the equilateral triangle, forming an angle of 60 degrees with the line connecting the Earth and the spacecraft.
A. The magnitude of the net gravitational force exerted on the spacecraft by the Earth and Moon can be calculated using the formula for gravitational force:
Gravitational force (F) = G * ((m1 * m2) / r^2)
Where G is the gravitational constant (6.67430 x 10^-11 N*m^2/kg^2), m1 and m2 are the masses of the objects (Earth, Moon, or spacecraft), and r is the distance between the objects.
Given:
Mass of Earth (mE) = 5.972 × 10^24 kg
Mass of Moon (mM) = 7.348 × 10^22 kg
Mass of spacecraft (mS) = 1470 kg
Length of the sides of the equilateral triangle (s) = km = 1,000 m
To find the magnitude of the net gravitational force on the spacecraft, we need to consider the gravitational forces between the spacecraft and both the Earth and the Moon. Since the triangle is equilateral, the distance between the spacecraft and each of the celestial bodies is equal to s.
F_Earth = G * ((mE * mS) / s^2)
F_Moon = G * ((mM * mS) / s^2)
Net gravitational force (F_net) = F_Earth + F_Moon
B. The direction of the net gravitational force on the spacecraft is toward the center of the equilateral triangle formed by the Earth, Moon, and spacecraft. This direction can be considered as the direction of the resultant force vector acting on the spacecraft.
C. To determine the direction as an angle measured from a line connecting the Earth and the spacecraft, we need to visualize the equilateral triangle. One way to define the angle is to measure it from the line connecting the Earth and the spacecraft to the line connecting the Earth and the Moon. This angle will be 60 degrees since the equilateral triangle has three equal angles of 60 degrees.
D. The minimum amount of work required to move the spacecraft to a point far from the Earth and Moon would be equal to the change in potential energy. As the spacecraft moves far away, the potential energy decreases. The work done is given by the formula:
Work (W) = ΔPE = PE_final - PE_initial
Since the potential energy depends on the distance from the Earth and Moon, moving the spacecraft to a point far away where the gravitational influence is negligible would result in a significant decrease in potential energy. The exact value of the work required would depend on the final location and the reference point for potential energy calculations.
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A meteorite is DIFFERENT from a comet mainly because it
A) has a tail of ice and dust.
B) enters the Earth’s atmosphere.
C) has a nucleus made of snow and rock.
Eliminate
D) is found in orbit between Mars and Jupiter.
What is the magnitude of the electrostatic force between two electrons each having a charge of 1.6 x 10-19 C separated by a distance of 1.00 × l0– 8 meter?
Answer:
[tex]fe = \frac{9 \times 10 {}^{9} \times 1.6 \times 10 {}^{ - 19} \times 1.6 \times 10 { - 19}^{?} }{(1 \times 10 { }^{ - 8}) {}^{2} } \\ fe = 23.04 \times 10 {}^{ - 13} n[/tex]
¿Cuáles de las siguientes cualidades permiten identificar un cuerpo como planeta? I) Debe ser aproximadamente esférico. II) Debe girar en torno a una estrella. III) Su velocidad debe ser constante.
Answer:
The correct answer is ii) It must revolve around a star
Explanation:
For a celestial body to be called a planet, it must meet at least three characteristics
* rotate around a star
* its mass must be sufficient to maintain hydrostatic equilibrium
* have control over its orbital that is to say to prevent that other body is in its same orbital
if we check the different proportions
i) False. Most of the planets are spheres deformed by their rotation on themselves and around the star
ii) True. It is in accordance with the minimum characteristics of the plants
iii) False .. the orbit of the planet can be elliptical and the speed changes at each point for this at a different distance from the star that is in a focus of the ellipse.
The correct answer is ii) It must revolve around a star
Write down 2 differences between electrical conductors and electrical insulators.
Answer:
electrical conductors help electric current to pass through it
electrical conductors are usually made of any metal
electrical insulator don't help electric current to pass through it
electrical insulators are made of non metals
hope it helped you
Explanation:
conductors allows free flow of electrons from one atom to another.
insulators restrict free flow of electrons
conductors allow electrical energy to pass through them
insulators do not allow electrical energy to pass through them
Consider two spinning tops with different radii. Both have the same linear instantaneous velocities at their edges. Which top has a smaller angular velocity? the top with the smaller radius because the radius of curvature is inversely proportional to the angular velocity the top with the smaller radius because the radius of curvature is directly proportional to the angular velocity the top with the larger radius because the radius of curvature is inversely proportional to the angular velocity The top with the larger radius because the radius of curvature is directly proportional to the angular velocity
Answer:
the top with the largest radius because the radius of curvature is inversely proportional to the angular velocity
Explanation:
Angular and linear velocity are related
v = w r
w = v / r
Therefore, if the linear velocity of the two is the same, the one with the smaller radius has the higher angular velocity.
When reviewing the answers, the correct one is:
the top with the largest radius because the radius of curvature is inversely proportional to the angular velocity
The top that has a smaller angular velocity is D. the top with the larger radius because the radius of curvature is directly proportional to the angular velocity.
It should be noted that the top that has a higher angular velocity will be the top with the smaller radius because the radius of curvature is inversely proportional to the angular velocity
On the other hand, since the two spinning tops have different radii while both have the same linear instantaneous velocities at their edges, then the top that has a smaller angular velocity is the top with the larger radius because the radius of curvature is directly proportional to the angular velocity.
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In a slow-pitch softball game, a 0.200-kg softball crosses the plate at 15.0 m/s at an angle of 45.0° below the horizontal. The batter hits the ball toward center field, giving it a velocity of 40.0 m/s at 30.0° above the horizontal. (a) Determine the impulse delivered to the ball. (b) If the force on the ball increases linearly for 4.00 ms, holds constant for 20.0 ms, and then decreases to zero linearly in another 4.00 ms, what is the maximum force on the ball?
The impulse delivered to the softball in the slow-pitch game is determined by the change in momentum of the ball.
Given that the initial velocity of the ball is 15.0 m/s at an angle of 45.0° below the horizontal, and the final velocity is 40.0 m/s at 30.0° above the horizontal, we can calculate the change in momentum using vector addition.
(a) The impulse delivered to the ball can be found by subtracting the initial momentum from the final momentum:
[tex]\[\text{{Impulse}} = \Delta \text{{momentum}} = \text{{final momentum}} - \text{{initial momentum}}\][/tex]
To calculate the momentum, we need to find the x- and y-components of the initial and final velocities. Given that the mass of the softball is 0.200 kg, the x-component and y-component velocities are:
[tex]\[v_{i_x} = 15.0 \, \text{{m/s}} \cdot \cos(-45.0°) \quad \text{{and}} \quad v_{i_y} = 15.0 \, \text{{m/s}} \cdot \sin(-45.0°)\][/tex]
[tex]\[v_{f_x} = 40.0 \, \text{{m/s}} \cdot \cos(30.0°) \quad \text{{and}} \quad v_{f_y} = 40.0 \, \text{{m/s}} \cdot \sin(30.0°)\][/tex]
The initial momentum is given by [tex]\(p_{i_x} = m \cdot v_{i_x}\)[/tex] and [tex]\(p_{i_y} = m \cdot v_{i_y}\)[/tex], and the final momentum is given by [tex]\(p_{f_x} = m \cdot v_{f_x}\)[/tex] and [tex]\(p_{f_y} = m \cdot v_{f_y}\)[/tex].
The total impulse is the vector sum of the x- and y-component impulses:
[tex]\[\text{{Impulse}} = \sqrt{(\Delta p_x)^2 + (\Delta p_y)^2}\][/tex]
(b) To determine the maximum force on the ball, we need to consider the change in momentum over time. The force is given by Newton's second law: [tex]\(F = \frac{\Delta p}{\Delta t}\)[/tex].
In this case, the force on the ball increases linearly for 4.00 ms, holds constant for 20.0 ms, and then decreases to zero linearly in another 4.00 ms. By knowing the time intervals and the change in momentum, we can calculate the force during each phase:
- Phase 1 (increasing force): The change in momentum [tex](\(\Delta p_1\))[/tex] can be calculated by multiplying the impulse by the fraction of time during this phase [tex](\(\frac{4.00}{28.00}\))[/tex].
- Phase 2 (constant force): The change in momentum [tex](\(\Delta p_2\))[/tex] can be calculated by multiplying the impulse by the fraction of time during this phase [tex](\(\frac{20.00}{28.00}\))[/tex].
- Phase 3 (decreasing force): The change in momentum [tex](\(\Delta p_3\))[/tex] can be calculated by multiplying the impulse by the fraction of time during this phase [tex](\(\frac{4.00}{28.00}\))[/tex].
The maximum force on the ball is the maximum of the forces during these three phases.
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A mass of 327 g connected to a light spring of force constant 27.6 N/m oscillates on a horizontal, frictionless track. The amplitude of the motion is 6.7 cm. Calculate the total energy of the system. Answer in units of J. 009 (part 2 of 3) 10.0 points What is the maximum speed of the mass? Answer in units of m/s. 010 (part 3 of 3) 10.0 points What is the magnitude of the velocity of the mass when the displacement is equal to 3.9 cm? Answer in units of m/s.
The total energy of the system is 7.06 J. The maximum speed of the mass is 0.692 m/s. The magnitude of the velocity of the mass when the displacement is equal to 3.9 cm is 0.455 m/s.
When a mass of 327 g is connected to a light spring of force constant 27.6 N/m oscillates on a horizontal, frictionless track with an amplitude of motion of 6.7 cm. The total energy of the system is obtained by adding the kinetic energy of the mass and the potential energy of the spring. By using the formula for total energy of a system given as E = ½ kA², where k is the force constant and A is the amplitude of oscillation, we get; E = ½ (27.6 N/m) (0.067 m)²E = 7.06 J Therefore, the total energy of the system is 7.06 J. Maximum speed of the mass: The maximum speed of the mass is given by the formula v_max = Aω, where A is the amplitude of oscillation and ω is the angular frequency given by ω = √(k/m).
Therefore, the maximum speed of the mass is; v_max = Aωv_max = (0.067 m) √(27.6 N/m / 0.327 kg)v_max = 0.692 m/s Magnitude of velocity of the mass: To obtain the magnitude of the velocity of the mass when the displacement is equal to 3.9 cm, we use the formula v = Aω cos(ωt) and find the value of t such that the displacement is 3.9 cm. The magnitude of the velocity of the mass is obtained by taking the absolute value of v.Using the relationship between the angular frequency and period given by T = 2π/ω, we have T = 2π/√(k/m) = 2π/√(27.6/0.327) = 1.48 s. Since the displacement is equal to 3.9 cm, we have;0.039 m = 0.067 m cos(ωt)ωt = cos⁻¹(0.039/0.067)ωt = 1.012 rad Therefore, the magnitude of the velocity of the mass is given by;v = Aω cos(ωt) = (0.067 m) √(27.6 N/m / 0.327 kg) cos(1.012) = 0.455 m/s.
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how many times greater is the size of our galaxy than our solar system
We can deduce here that our galaxy, the Milky Way is about 100 million times larger than the solar system.
What is solar system?The solar system refers to the collection of celestial bodies that are gravitationally bound to the Sun, our star. It includes the Sun, planets, moons, asteroids, comets, and other smaller objects that orbit the Sun.
The solar system formed about 4.6 billion years ago from a rotating cloud of gas and dust called the solar nebula. It represents a complex and diverse system that has been the subject of extensive exploration and study by space probes, telescopes, and missions.
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Water flows smoothly through a pipe with various circular cross-sections of diameters 2D, 6D,and D`, respectively.
What is the ratio of the speed in section 3 to the speed in section 1?
In which section is the pressure largest? Choose the best answer.
Therefore, the largest pressure is in section 1. Therefore, the answer is Section 1.
Water flows smoothly through a pipe with various circular cross-sections of diameters 2D, 6D, and D', respectively. The velocity, pressure, and volume flow rate of water in the pipe are all unknown. In this case, Bernoulli's equation can be used to determine the velocity and pressure changes that occur throughout the pipe. However, Bernoulli's equation can be used to determine the velocity and pressure changes that occur throughout the pipe. The following is the formula for Bernoulli's equation:
p1 + (1/2)ρv1² + ρgh1 = p2 + (1/2)ρv2² + ρgh2
Where:
p1 is the pressure at section 1,
ρ is the density of water,
v1 is the velocity at section 1,
g is the acceleration due to gravity,
h1 is the height at section 1,
p2 is the pressure at section 2,
v2 is the velocity at section 2, and
h2 is the height at section 2.
Let's take the velocity ratio first. Bernoulli's equation can be used to calculate the velocity in each section.
p1 + (1/2)ρv1² + ρgh1 = p2 + (1/2)ρv2² + ρgh2
p2 = p1, h1 = h2, and ρ are all constants, and thus can be canceled. Using Bernoulli's equation, we get:
(1/2)ρv1² = (1/2)ρv2² + (1/2)ρv3²
v3/v1 = (v1² - v2²)½ / (v1² - v3²)½ = (D'² - D²)½ / (D'² - 4D²)½
So, the ratio of the speed in section 3 to the speed in section 1 is (D'² - D²)½ / (D'² - 4D²)½.
Next, the pressure in each section can be determined using Bernoulli's equation. In a fluid flow system, when the speed of the fluid increases, the pressure of the fluid decreases. As a result, the pressure is the highest in section 1, and the pressure decreases as the fluid flows through sections 2 and 3.
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What must be true about a surface in order for diffuse reflection to occur?
Answer:
carpet
Explanation:
Diffuse reflection is the reflection of light from a surface such that an incident ray is reflected at many angles rather than at just one angle as in the case of specular reflection.
The structure of carpet's surface is as shown. Thus it shows large amount of diffuse reflection.
In a real pully system the work supplied must be _____ the work accomplished and no links plz
When you think of the word "respiration," you might think about the process of breathing, which is actually called ventilation. (The respiratory system consists of the windpipe, lungs, etc.) How is breathing related to cellular respiration?
Answer:
Breathing and cellular respiration are complementary processes that enable the body to produce energy by taken in oxygen which is required for the chemicals contained in food to be broken down there by producing, energy, water and carbon dioxide. The breathing and cellular respiration process also enables the removal of the produced carbon dioxide finally through nose and/or mouth
Explanation:
In cellular respiration, glucose molecules in the presence of oxygen gas are broken down into carbon dioxide and water aerobically in living cells, to release energy and produce ATP as follows;
C₆H₁₂O₆ + 6O₂ → 6CO₂ + 6H₂O
During breathing, oxygen is inhaled into the lungs from the atmosphere and carbon dioxide is exhaled from the longs into the atmosphere, such that the carbon dioxide produced during cellular respiration is transported out of the body through the veins respiratory system, from where is passes out through the nose, while oxygen used in cellular respiration comes from breathing in oxygen into the respiratory system
The oxygen is then transported to the cells through by blood in the blood vessels of the circulatory system to the cells, where the cells use the oxygen for cellular respiration to release energy.
A car traveling at 60km/h undergoes uniform acceleration at a rate of 2/ms^2 until is velocity reached 120km/h determine the distance traveled and the time taken to make the distance
Explanation:
Given that,
Initial speed of a car, u = 60 km/h = 16.67 m/s
Acceleration, a = 2m/s²
Final speed, v = 120 km/h = 33.33 m/s
We need to find the distance traveled and the time taken to make the distance.
acceleration = rate of change of velocity
[tex]a=\dfrac{v-u}{t}\\\\t=\dfrac{v-u}{a}\\\\t=\dfrac{33.33 -16.67 }{2}\\\\t=8.33\ s[/tex]
let the distance be d.
[tex]d=\dfrac{v^2-u^2}{2a}\\\\d=\frac{33.33^{2}-16.67^{2}}{2(2)}\\\\d=208.25\ m[/tex]
Hence, the distance traveled and the time taken to make the distance is 208.25 m and 8.33 seconds respectively.
Bilateria are characterized by Multiple Choice a plane of symmetry around a transverse plane across the center of the body so that the front and back halves are mirror images. a plane of symmetry that forms mirror images around any plane through the longitudinal midline of the body. a plane of symmetry that forms mirror images around a horizontal plane in the midline. a plane of symmetry that forms mirror images around a vertical plane in the midline. a plane of symmetry that forms mirror images around an oblique plane in the midline.
Answer:
A plane of symmetry that forms mirror images around a vertical plane in the midline.
Explanation:
Bilateria are animals that have a bilateral symmetry,
Bilateral symmetry refers to organisms that are mirror images along their midline called a sagittal plane.
Examples of bilateria include butterflies and humans because, a line through their midline divides the organism into two identical halves which are mirror images of each other.
So, Bilateria are characterized by a plane of symmetry that forms mirror images around a vertical plane in the midline.
Fleas have remarkable jumping ability. A 0.60mg flea, jumping straight up, would reach a height of 35cm if there were no air resistance. In reality, air resistance limits the height to 20cm .
Part A
What is the flea's kinetic energy as it leaves the ground?
Part B
At its highest point, what fraction of the initial kinetic energy has been converted to potential energy?
The kinetic energy of the flea as it leaves the ground is 0.0072 J. At its highest point, approximately 30.56% of the initial kinetic energy has been converted to potential energy.
Part A:
The kinetic energy of an object can be calculated using the formula:
[tex]\[ KE = \frac{1}{2}mv^2 \][/tex]
where m is the mass of the flea and v is its velocity. Given that the flea has a mass of 0.60 mg (or [tex]0.60 \times 10^{-3} g[/tex]), we first convert it to kilograms:
[tex]\[ m = 0.60 \times 10^{-6} \, \text{kg} \][/tex]
The velocity of the flea can be determined by considering the height it reaches with and without air resistance. Without air resistance, it would reach a height of 35 cm, which can be converted to meters as 0.35 m. However, due to air resistance, the height is limited to 20 cm, or 0.20 m. Using the concept of conservation of mechanical energy, we can equate the initial kinetic energy to the potential energy at the maximum height:
KE = PE
[tex]\[ \frac{1}{2}mv^2 = mgh \][/tex]
Solving for v :
[tex]\[ v = \sqrt{2gh} \][/tex]
Substituting the values of [tex]\( g = 9.8[/tex] [tex]\text{m/s}^2 \)[/tex] and [tex]\( h = 0.20 \, \text{m} \)[/tex], we can calculate the velocity:
[tex]\[ v = \sqrt{2 \times 9.8 \times 0.20} \approx 1.98 \, \text{m/s} \][/tex]
Now we can calculate the kinetic energy:
[tex]\[ KE = \frac{1}{2} \times 0.60 \times 10^{-6} \times (1.98)^2 \approx 0.0072 \, \text{J} \][/tex]
Part B:
At its highest point, the flea's velocity is zero, so all of its initial kinetic energy has been converted to potential energy. The fraction of the initial kinetic energy converted to potential energy can be calculated by dividing the potential energy at the highest point by the initial kinetic energy:
[tex]\[ \text{Fraction} = \frac{PE}{KE} \][/tex]
Since the flea's mass remains constant and the gravitational force is the same throughout the motion, the ratio of potential energy to kinetic energy is equal to the ratio of the height at the highest point to the total height the flea could have reached without air resistance:
[tex]\[ \text{Fraction} = \frac{h_{\text{max}}}{h_{\text{total}}} \][/tex]
Substituting the values of [tex]\( h_{\text{max}} = 0.20 \, \text{m} \)[/tex] and [tex]\( h_{\text{total}} = 0.35 \, \text{m} \)[/tex], we can calculate the fraction:
[tex]\[ \text{Fraction} = \frac{0.20}{0.35} \approx 0.5714 \][/tex]
Multiplying by 100 to convert to a percentage, the fraction is approximately 57.14%. Therefore, approximately 30.56% (100% - 57.14%) of the initial kinetic energy has been converted to potential energy at the flea's highest point.
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1. how many lines of symmetry does a square have?
2. how many lines of symmetry does a triangle have?
3. how many lines of symmetry does a pentagon have?
4. how many lines of symmetry does a hexagon?
Answer:
1) four lines
2) three lines
3) fives lines
4) six lines
Answer:
4
Explanation:
Calculate the rotational kinetic energy of a 12-kg motorcycle wheel if its angular velocity is 120 rad/s and its inner radius is 0.280 m and outer radius 0.330 m. 809.14 J O 1056.32 J 646.38 O 1218.56 J
The rotational kinetic energy of the motorcycle wheel is 809.14 J.
The formula for rotational kinetic energy (KE) is given by KE = (1/2)Iω², where I is the moment of inertia and ω is the angular velocity.
To calculate the moment of inertia of the motorcycle wheel, we need to consider its shape. The wheel can be approximated as a solid cylindrical disk. The moment of inertia for a solid disk rotating about its axis is given by I = (1/2)mr², where m is the mass of the wheel and r is the radius.
Given:
Mass of the wheel (m) = 12 kg
Inner radius (r₁) = 0.280 m
Outer radius (r₂) = 0.330 m
Angular velocity (ω) = 120 rad/s
First, we calculate the moment of inertia for the entire wheel by considering it as a solid disk. The average radius (r_avg) of the wheel can be calculated as (r₁ + r₂) / 2.
r_avg = (0.280 m + 0.330 m) / 2 = 0.305 m
Next, we substitute the values into the formula for moment of inertia:
I = (1/2)mr² = (1/2)(12 kg)(0.305 m)² = 1.1034 kg·m²
Finally, we substitute the moment of inertia and the angular velocity into the formula for rotational kinetic energy:
KE = (1/2)Iω² = (1/2)(1.1034 kg·m²)(120 rad/s)² ≈ 809.14 J
The rotational kinetic energy of the motorcycle wheel, with a mass of 12 kg, an angular velocity of 120 rad/s, an inner radius of 0.280 m, and an outer radius of 0.330 m, is approximately 809.14 J.
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At 237.0 kPa and 327.0°C, an ideal gas occupies 3.45 m3. Find the number of moles of the gas. Submit Answer Tries 0/12 If the pressure is now raised to 571 kPa and temperature reduced to 76.0°C, what is the new volume? Tries 0/12 Submit Answer
At 237.0 kPa and 327.0°C, an ideal gas law occupies 3.45 m3. Find the number of moles of the gas is 150.9 mol.
To find the number of moles of the gas at a given pressure and temperature, we can use the ideal gas law. The new volume can be determined by applying the ideal gas law again with the updated pressure and temperature values.
The ideal gas law equation is given by[tex]PV = nRT[/tex], where P is the pressure, V is the volume, n is the number of moles, R is the gas constant, and T is the temperature in Kelvin.
For the first part, we are given the pressure (237.0 kPa), temperature (327.0°C), and volume (3.45 m³). To find the number of moles, we need to convert the temperature to Kelvin by adding 273.15 to it. Then, we rearrange the ideal gas law equation to solve for n: [tex]n = PV / RT[/tex]. Plug in the values and calculate to find the number of moles.
For the second part, we are given the new pressure (571 kPa) and temperature (76.0°C). Again, convert the temperature to Kelvin and use the rearranged ideal gas law equation to solve for the new volume, [tex]V = nRT / P[/tex]. Substitute the values of n, R, T, and P to calculate the new volume.
By applying the ideal gas law in both cases, we can determine the number of moles of the gas and the new volume based on the given pressure and temperature conditions.
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Which describes an image that a concave mirror can make? Which describes an image that a concave mirror can make?
Answer: The image can be either virtual or real.
Answer:
the image can be rather real or virtual
PLEASE HELP WILL MARK BRAINLIEST PLS
Answer: 2
Explanation:
A clerk moves a box of cans down an aisle by pulling on a strap attached to the box. The clerk pulls with a force of 185. 0 N at an angle of 25. 0 degrees with the horizontal. The box has a mass of 35. 0 kg, and the coefficient of kinetic friction between the box and the floor is 0. 450. Find the acceleration of the box
The force of friction is parallel to the ground surface and opposes the motion of the object. The force of friction acting on the object is determined by the equation:
f=f(k)FN
where FN is the normal force, f(k) is the coefficient of kinetic friction, and f is the force of friction acting on the object.
The formula for acceleration is:a = Fnet / mWhere Fnet is the net force acting on the object and m is the mass of the object.The forces acting on the object in this example are the force of gravity and the force applied by the clerk.
[tex]F_gravity = mg = (35.0 kg) (9.81 m/s^2) = 343.5 N[/tex]
The force applied by the clerk can be resolved into horizontal and vertical components:
[tex]F_applied_horiz = F_applied * cos(25.0) = (185.0 N) cos(25.0) = 166.8 NF_applied_vert = F_applied * sin(25.0) = (185.0 N) sin(25.0) = 78.9 N[/tex].
The normal force is equal and opposite to the force of gravity acting on the object:
[tex]FN = F_gravity = 343.5 N[/tex]
The force of friction acting on the object is:
[tex]f = f(k) * FN = (0.450) (343.5 N) = 154.6 N[/tex]
The net force acting on the object is:
[tex]Fnet = F_applied_horiz - f = 166.8 N - 154.6 N = 12.2 N[/tex]
The acceleration of the object is:
[tex]a = Fnet / m = 12.2 N / 35.0 kg = 0.349 m/s^2[/tex]
Therefore, the acceleration of the box is 0.349 m/s².
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1. meaning of heat and temperature
2. differences between heat and temperature
Answer:
1.heat is a form of 1.temperature is a form
energy that gives of energy that is used to
sensation of measure hotness or
warmth. or coldness of body.
2.its si unit is 2.its si unit is kelvin.
joule.
The plates on a vacuum capacitor have a radius of 3.0 mm and are separated by a distance of 1.5 mm. What is the capacitance of this capacitor?
1) Si un mango cae a una velocidad de 75m/s y tarda 26 seg. en caer. ¿ Cuál habrá sido la velocidad con qué el mango llegó al suelo?
Answer:
El mango llega al suelo a una velocidad de 329.982 metros por segundo.
Explanation:
El mango experimenta un movimiento de caída libre, es decir, un movimiento uniformemente acelerado debido a la gravedad terrestre, despreciando los efectos de la viscosidad del aire y la rotación planetaria. Entonces, la velocidad final del mango, es decir, la velocidad con la que llega al suelo, se puede determinar mediante la siguiente fórmula cinemática:
[tex]v = v_{o}+g\cdot t[/tex] (1)
Donde:
[tex]v_{o}[/tex] - Velocidad inicial, en metros por segundo.
[tex]v[/tex] - Velocidad final, en metros por segundo.
[tex]g[/tex] - Aceleración gravitacional, en metros por segundo al cuadrado.
[tex]t[/tex] - Tiempo, en segundos.
Si sabemos que [tex]v_{o} = -75\,\frac{m}{s}[/tex], [tex]g = -9.807\,\frac{m}{s^{2}}[/tex] y [tex]t = 26\,s[/tex], entonces la velocidad final del mango es:
[tex]v = v_{o}+g\cdot t[/tex]
[tex]v = -75\,\frac{m}{s}+\left(-9.807\,\frac{m}{s} \right)\cdot (26\,s)[/tex]
[tex]v = -329.982\,\frac{m}{s}[/tex]
El mango llega al suelo a una velocidad de 329.982 metros por segundo.
1. boiling point of water
water vapor
2. formed by condensation
sun
3. freezing point of water
clouds
4. gas form of water
precipitation
5. main cause of evaporation
32° F
6. rain, sleet, snow, or hail
100° C
Answer:
what is the question. . .
Answer:
see the answer above
Explanation:
A photon of wavelength 0.0940 nm strikes a free electron that is initially at rest and the photon is scattered backwards at an angle of 180 degree from its original direction. (Give your answer in keV. 1 keV = 10^3 eV.) a) What is the energy of the scattered photon? b) What is the speed of the electron after it has had the collision with the photon?
Photon with wavelength 0.0940 nm scatters backward, transferring energy and momentum to an initially at rest free electron. (a) The energy of the scattered photon is approximately 2.102 keV, and (b) the speed of the electron after the collision is approximately 7.679 × 10¹⁴ m/s.
Here is the explanation :
a) To find the energy of the scattered photon, we can use the energy-wavelength relationship for photons:
[tex]E = \frac{hc}{\lambda}[/tex]
Where:
E is the energy of the photon,
h is Planck's constant (6.626 × 10⁻³⁴ J·s),
c is the speed of light (3.00 × 10⁸ m/s),
λ is the wavelength of the photon.
First, let's convert the wavelength from nanometers to meters:
λ = 0.0940 nm = 0.0940 × 10⁻⁹ m
Substituting the values into the equation, we have:
[tex]E = \frac{6.626 \times 10^{-34} \cdot 3.00 \times 10^{8}}{0.0940 \times 10^{-9}} \text{ J}[/tex]
Calculating this expression, we find:
E ≈ 2.102 keV
Therefore, the energy of the scattered photon is approximately 2.102 keV.
b) To determine the speed of the electron after the collision with the photon, we can use the
. Since the electron is initially at rest, the momentum of the system before the collision is zero. After the collision, the momentum of the electron and the scattered photon must still add up to zero.
Since the photon is scattered backward at an angle of 180 degrees, its momentum after the collision is equal in magnitude but opposite in direction to its initial momentum. Let's denote the magnitude of the photon's momentum as p.
The momentum of the electron after the collision is given by its mass (m) multiplied by its final velocity (v). Let's denote the final velocity of the electron as [tex]v_\text{e}[/tex].
Considering the conservation of momentum, we have:
-p + m * [tex]v_\text{e}[/tex] = 0
Solving for [tex]v_\text{e}[/tex], we find:
[tex]v_\text{e} = \frac{p}{m}[/tex]
The momentum of a photon can be calculated using the equation:
[tex]p = \frac{E}{c}[/tex]
Where:
E is the energy of the photon,
c is the speed of light.
Using the energy value we calculated in part a, we have:
[tex]p = \frac{2.102 \times 10^{-1}}{3.00 \times 10^{8}} \text{ MeV/m}[/tex]
Calculating this expression, we find:
p ≈ 7.007 × 10⁻¹⁶ kg·m/s
Now, the mass of an electron is approximately 9.109 × 10⁻³¹ kg. Substituting these values into the equation for the final velocity, we have:
[tex]\begin{equation}v_e = \frac{7.007 \times 10^{-16} \text{ kg·m/s}}{9.109 \times 10^{-31} \text{ kg}}[/tex]
Calculating this expression, we find:
v_e ≈ 7.679 × 10¹⁴ m/s
Therefore, the speed of the electron after the collision with the photon is approximately 7.679 × 10¹⁴ m/s.
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two 2.10 cm × 2.10 cm plates that form a parallel-plate capacitor are charged to ± 0.706 nc. What is the electric field strength inside the capacitor if the spacing between the plates is 1.30 mm ?
The electric field strength inside the capacitor is approximately 541.5 V/m if the spacing between the plates is 1.30 mm.
The electric field strength (E) inside a parallel-plate capacitor is given by the formula:
E = σ / ε₀
where σ is the surface charge density on the plates and ε₀ is the permittivity of free space.
To calculate E, we need to find the surface charge density on the plates. The surface charge density (σ) is defined as the charge (Q) divided by the area (A) of the plate:
σ = Q / A
Given that the plates are charged to ±0.706 nC and have dimensions of 2.10 cm × 2.10 cm, we can calculate the surface charge density:
σ = (±0.706 nC) / (2.10 cm × 2.10 cm)
Next, we need to convert the spacing between the plates to meters:
d = 1.30 mm = 1.30 × 10^(-3) m
Finally, we can substitute the values of σ and ε₀ into the formula for E:
E = σ / ε₀
Using the value of ε₀ = 8.854 × 10^(-12) F/m, we can calculate the electric field strength (E).
The electric field strength inside the capacitor, with plates charged to ±0.706 nC and a spacing of 1.30 mm, is approximately 541.5 V/m.
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A sled weighing 200 N is held in place by static friction on a 15? incline.
(a) What is the coefficient of static friction between the sled and the incline?
(b) The sled is now pulled up the incline at constant speed by a child weighing 500 N, pulling with a force of 100 N. The rope makes an angle of 30? with respect to the incline and has negligible mass. What is the coefficient of kinetic friction between the sled and the incline?
Static friction keeps a sled weighing 200 N in place on a 15.
(a) The coefficient of static friction between the sled and the incline is approximately 0.27.
(b) The coefficient of kinetic friction between the sled and the incline is approximately 0.443.
To solve this problem, we'll use the following formulas:
For static friction:
[tex]\[F_\text{static friction} = \mu_s \cdot N\][/tex] = μ_s * N
For kinetic friction:
[tex]\[F_\text{kinetic friction} = \mu_k \cdot N\][/tex]
Where:
[tex]\[F_\text{static friction}[/tex] is the force of static friction,
[tex]\[F_{\text{kinetic friction}}[/tex] is the force of kinetic friction,
[tex]\[\mu_s\][/tex] is the coefficient of static friction,
[tex]\[\mu_k\][/tex] is the coefficient of kinetic friction, and
N is the normal force.
(a) To find the coefficient of static friction between the sled and the incline when it is held in place, we need to determine the normal force acting on the sled.
The normal force (N) is equal to the component of the weight of the sled perpendicular to the incline. In this case, the incline is at an angle of 15 degrees, so the normal force can be calculated as:
N = mg * cos(theta)
where m is the mass of the sled and g is the acceleration due to gravity (approximately 9.8 m/s²).
Given that the weight of the sled is 200 N, we can find its mass (m) using the formula:
weight = mass * gravity
200 N = m * 9.8 m/s²
Solving for m:
[tex]m = \frac{200 N}{9.8 m/s^2} \approx 20.41 kg[/tex]
Now, we can calculate the normal force:
N = 20.41 kg * 9.8 m/s² * cos(15 degrees)
N ≈ 195.43 N
Next, we can use the formula for static friction to find the coefficient of static friction ([tex]\ensuremath{\mu s}[/tex]):
[tex]F_\text{static friction} = \mu_s \cdot N[/tex]
The force of static friction is equal to the component of the weight of the sled parallel to the incline, which is given by:
[tex]F_\text{parallel} = mg \cdot \sin(\theta)[/tex]
[tex]F_parallel = 20.41 kg * 9.8 m/s² * sin(15 degrees)[/tex]
[tex]F_parallel[/tex] ≈ 52.87 N
Since the sled is held in place, the force of static friction is equal to the force parallel to the incline:
[tex]F_static_friction[/tex] = 52.87 N
Plugging this into the formula:
52.87 N = [tex]\ensuremath{\mu s}[/tex] * 195.43 N
Solving for [tex]\ensuremath{\mu s}[/tex]:
[tex]\begin{equation}\mu_s = \frac{52.87\text{ N}}{195.43\text{ N}} \approx 0.27\end{equation}[/tex]
Therefore, the coefficient of static friction between the sled and the incline is approximately 0.27.
(b) When the sled is pulled up the incline at a constant speed, the force of static friction changes to the force of kinetic friction. The force of kinetic friction is given by:
[tex]\begin{equation}F_\text{kinetic friction} = \mu_k N\end{equation}[/tex]
In this case, the force pulling the sled up the incline is 100 N, and the angle between the rope and the incline is 30 degrees. We can calculate the force parallel to the incline:
[tex]F_parallel = 100 N * cos(30 degrees) = 86.60 N[/tex]
To find the coefficient of kinetic friction ([tex]$\mu_k$[/tex]), we need to determine the normal force (N) acting on the sled.
The normal force can be calculated as before:
[tex]$N = mg \cos(\theta)$[/tex]
[tex]$N = 20.41\ \text{kg} \times 9.8\ \text{m/s}^2 \times \cos(15^\circ)$[/tex]
N ≈ 195.43 N
Now, we can plug in the values into the formula for kinetic friction:
86.60 N = [tex]$\mu_k$[/tex] * 195.43 N
[tex]\[\mu_k = \frac{86.60 \text{ N}}{195.43 \text{ N}} \approx 0.443\][/tex]
Therefore, the coefficient of kinetic friction between the sled and the incline is approximately 0.443.
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An electron moves along the z-axis with vz=3.8×107m/svz=3.8×107m/s. As it passes the origin, what are the strength and direction of the magnetic field at the following (xx, yy, zz) positions?
A. (2 cmcm , 0 cmcm, 0 cmcm)
B. (0 cmcm, 0 cmcm, 1 cmcm )
C. (0 cmcm, 2 cmcm , 1 cmcm )
At position A, the magnetic field is directed in the positive z-direction with a magnitude of [tex]9.5 * 10^{-2}[/tex] Tesla.
At position B, the magnetic field is directed in the positive z-direction with a magnitude of [tex]1.52 * 10^{-6}[/tex] Tesla.
At position C, the magnetic field is directed in the positive y and z directions with a magnitude of [tex]2.85 * 10^{-1}[/tex] Tesla in the y-direction and [tex]1.43 * 10^{-1}[/tex] Tesla in the z-direction.
To calculate the strength and direction of the magnetic field at different positions, we can use the Biot-Savart Law, which gives the magnetic field produced by a current-carrying wire.
In this case, we can consider the electron's velocity as a current and calculate the magnetic field using the equation:
B = (μ₀/4π) * (v × r) / r²
where B is the magnetic field, μ₀ is the permeability of free space [tex](4\pi * 10^{-7} T.m/A)[/tex], v is the velocity of the electron, r is the position vector from the current element to the point where we want to calculate the field, and × represents the cross product.
Let's calculate the magnetic field at each given position:
A. (2 cm, 0 cm, 0 cm):
First, convert the position to meters: (0.02 m, 0 m, 0 m)
The position vector, r = (0.02 m, 0 m, 0 m), points in the positive x-direction.
Using the Biot-Savart Law, we can calculate the magnetic field:
B = (μ₀/4π) * (v × r) / r²
B = (4π * 10^{-7} T·m/A) * (3.8 × 10^7 m/s) * (0 m, 0 m, 1 m) / (0.02 m)²
B = (4π × 10^{-7} T·m/A) * (3.8 × 10^7 m/s) * (0 m, 0 m, 1 m) / (0.0004 m)
B = 9.5 × 10^{-2} T * (0 m, 0 m, 1 m) = (0 T, 0 T, 9.5 × 10^{-2} T)
Therefore, at position A, the magnetic field is directed in the positive z-direction with a magnitude of 9.5 × 10^{-2} Tesla.
B. (0 cm, 0 cm, 1 cm):
First, convert the position to meters: (0 m, 0 m, 0.01 m)
The position vector, r = (0 m, 0 m, 0.01 m), points in the positive z-direction.
Using the Biot-Savart Law, we can calculate the magnetic field:
B = (μ₀/4π) * (v × r) / r²
B = (4π × 10^{-7}T·m/A) * (3.8 × 10^7 m/s) * (0 m, 0 m, 0.01 m) / (0.01 m)²
B = (4π × 10^{-7} T·m/A) * (3.8 × 10^7 m/s) * (0 m, 0 m, 1 m)
B = 1.52 × 10^{-6} T * (0 m, 0 m, 1 m) = (0 T, 0 T, 1.52 × 10^{-6} T)
Therefore, at position B, the magnetic field is directed in the positive z-direction with a magnitude of 1.52 × 10^{-6} Tesla.
C. (0 cm, 2 cm, 1 cm):
First, convert the position to meters: (0 m, 0.02 m, 0.01 m)
The position vector, r = (0 m, 0.02 m, 0.01 m), points in the positive y and z directions.
Using the Biot-Savart Law, we can calculate the magnetic field:
B = (μ₀/4π) * (v × r) / r²
B = (4π × 10^{-7} T·m/A) * (3.8 × 10^7 m/s) * (0 m, 0.02 m, 0.01 m) / (0.02 m)²
B = (4π × 10^{-7} T·m/A) * (3.8 × 10^7 m/s) * (0 m, 1 m, 0.5 m) / (0.0004 m)
B = 2.85 × 10^{-1} T * (0 m, 1 m, 0.5 m) = (0 T, 2.85 × 10^{-1} T, 1.43 × 10^{-1} T)
Therefore, at position C, the magnetic field is directed in the positive y and z directions with a magnitude of [tex]2.85 * 10^{-1}[/tex] Tesla in the y-direction and [tex]1.43 * 10^{-1}[/tex] Tesla in the z-direction.
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