The torque on the beam calculated from the principle of moments is 68 N to the right.
What is the torque on the beam?The torque on the beam is calculated using the principle of moments.
The principle of moments states that the sum of the clockwise moments is equal to the sum of the anticlockwise moments about a fixed point for a system in equilibrium.
Moment = force * perpendicular distance from the fulcrum
Taking the left end of the beam as the anticlockwise direction ad the right end of the beam as the clockwise direction:
Anticlockwise moment = F * (0.75 - 0.25)
Where F is the balancing force
Anticlockwise moment = 0.5f
Clockwise moment = (0.77 * 9.8) * (0.75 - 0.3)
Clockwise moment = 34 J
0.5 F = 34
F = 68 N
Hence, torque is 68 N
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A Ping-Pong ball hangs from a string that is attached to the rear view mirror of a parked car. The driver side window is open, and the passenger side window is closed. A strong breeze blows along the driver side of the car. What happens to the Ping-Pong ball? Assume the breeze is laminar and that Bernoulli’s equation applies. A Ping-Pong ball hangs from a string that is attached to the rear view mirror of a parked car (see A Ping-Pong ball hangs by a string from a car rearview mirror. The driver side window to the left of the mirror is open, while the passenger side window to the right of the mirror is closed.). The driver side window is open, and the passenger side window is closed. A strong breeze blows along the driver side of the car. What happens to the Ping-Pong ball? Assume the breeze is laminar and that Bernoulli’s equation applies.
a.The ball does not move in either direction.
b.The ball swings towards the passenger side.
c.The ball swings towards the driver side.
The answer is ball swings towards passenger side. correct option is (B).
Bernoulli's equation = P+1/2ρv^2+ ρgh=Constant,
so
P1+1/2ρv1^2+ ρgh1= P2+1/2ρv2^2+ ρgh2
(v1^2-v2^2)=g(h2-h1)
So from the formula we can see that the change in velocity depends on the height difference, and the wind blows the ping pong ball will move which will make a height difference and hence the ball will swing.
What is Bernoulli's equation-
According to the Bernoulli's principle of fluid dynamics, a fluid's speed increases at the same time as its static pressure or potential energy decreases.
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A car accelerating from 10m/s to 25m/s
in 6sec find average acceleration
Answer:
2.5 m/s
Explanation:
Please mark me as brainly
formula : a = v-u
t
that is : acceleration = final velocity - initial velocity
time
so answer goes like this :
a = 25 - 10
6
a = 15
6
a = 2.5 m/s
what will the total kinetic energy of the molecules in this system be when the system reaches equilibrium?
Answer:
When the system reaches equilibrium, the total kinetic energy of the molecules will be zero.
A ray of light passes from air into water at an angle of incidence of 50°. What is the angle of refraction?
Answer: index of refraction (air) = 1.0; index of refraction (water) = 1.33.
Explanation:
each of the four drawings shows the same three concentric loops of wire. the currents in the loops have the same magnitude i and have the directions shown. rank the magnitude of the net magnetic field produced at the center of each of the four drawings, largest to smallest.
The magnetic area is parallel to the direction of the contemporary within the twine. electric costs produce electric-powered fields and magnets produce magnetic fields.
A magnetic discipline is a vector discipline that describes the magnetic impact on moving electric expenses, electric-powered currents, and magnetic materials. A moving fee in a magnetic subject reviews a force perpendicular to its own velocity and to the magnetic field.
The magnetic area is the area round a magnet that has magnetic pressure. All magnets have north and south poles. contrary poles are attracted to every different, even as the identical poles repel each different. when you rub a bit of iron along a magnet, the north-looking for poles of the atoms inside the iron line up in the equal path.
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Disclaimer:- your question is incomplete, please see below for the complete question.
Each of the four drawings shows the same three concentric loops of wire. the currents in the loops have the same magnitude i and have the directions shown. rank the magnitude of the net magnetic field produced at the center of each of the four drawings, largest to smallest.
a steel cable supports an actor as he swings onto the stage. the weight of the actor stretches the steel cable. to describe the relationship between stress and strain for the steel cable, you would use
A steel cable supports an actor as he swings onto the stage, the weight of the actor stretches the steel cable, to describe the relationship between stress and strain for the steel cable, you would use Young's modulus. Correct answer: letter B.
Young's modulus is used in this statement because it is a measure of the stiffness of a material. The steel cable is stretched by the actor's weight, and the amount of stretch is related to the tension in the cable and the Young's modulus of the steel.
Which is Young's modulus?Is a measure of the stiffness of a material. It is defined as the ratio of the stress to the strain, and it is a measure of the ability of a material to resist deformation under load.
Therefore, when an actor's weight stretches a steel cable, the cable experiences tension. The amount of stress experienced by the steel cable is directly proportional to the amount of strain experienced by the steel cable. This relationship is described by Young's modulus.
A steel cable supports an actor as he swings onto the stage. The weight of the actor stretches the steel cable. To describe the relationship between stress and strain for the steel cable, you would use?
Group of answer choices:
a) both shear modulus and bulk modulus.
b) Young's modulus
c) bulk modulus.
d) shear modulus
e) both Young's modulus and bulk modulus.
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An object of mass 10 kg is placed on a frictionless
incline of 25°. Deduce how many seconds it would
take to travel down a 5.0 m incline from rest.
Initial velocity = 0 m/s
Displacement = 5 m
Acceleration = 10cos25° = 9.06 m/s^2
time = ? (To be calculated)
Using, S = ut + at^2/2, we have
5 = 0(t)+9.06t^2/2
10/9.06 = t^2
t = 1.006 seconds
You place a sheet of paper on a 3 beam balance, it has a mass of
3.15g, you then take the paper off the scale and rip it precisely in half.
Into two smaller sheets. You then put both pieces back on the scale,
what should the new mass be? ANswer:
The mass will remain same of 3.15g.
Mass is used in physics to express inertia, a fundamental function of all be counted.
Essentially, it's far a mass of depend's resistance to converting its direction or velocity in reaction to the application of a pressure. The exchange that an implemented pressure produces is smaller the extra mass a body has.
The kilogram, the unit of mass within the international gadget of units, corresponds to 6.62607015 1034 joule seconds the usage of Planck's constant (SI). One joule is produced with the aid of multiplying one kilogram via one square meter in keeping with second.
The kilogram is decided by using exact measurements of Planck's regular given that the second and the meter have formerly been defined in phrases of different physical constants.
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suppose you dropped a rock from a bridge into a valley below. earth pulls on the rock and it accelerated downward. according to newton's third law, the rock must also be pulling on earth, yet we don't notice the earth acceleration upward. explain.
We don't notice the earth acceleration upwarde because of its massive size, the earth is at rest
State Newton's third law of motion?
Newton's Third Law can be described as the Action & Reaction law.According to his third law, there is an equal and opposite reaction to every force (activity) in nature.If object A applies a force to object B, object B will respond with an equal and opposing force.The stone also pulls on the Earth in an equal measure, but the acceleration caused by that force on the Earth is minimal. Given that the mass of the Earth is 6.4 × 10^24 kg, the accelerations brought about by the stone's force acting on the Earth will be of the order of 10^–24, or essentially nothing.
Hence, because of its massive size, the earth is at rest.
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(iii) A car of mass 2000kg moves with an initial velocity of 40km/h and attain a final velocity of 120km/h which was maintained for a given distance. Calculate the impulse of the car.
160000 kgm/s is the impulse of the car.
J=mΔv
I= impulse
m= mass= 2000kg
Δv= change in velocity= 80 km
J=mΔv
I= 2000kg×80 km/s
I=160000 kgm/s
The concept of impulse is used to describe how a net force affects an item (a kind of "moving force"). Impulse is denoted by the letter J. The average net force acting on an item over time is calculated as an impulse. The force-time integral is J = Ft. The vector quantity of impulse is J = F dt (since force is a vector and time is a scalar).
Theorem of Impulse-Momentum According to the impulse-momentum theorem, an object's change in momentum equals the impulse that was delivered to it. J = ∆p The newton second is the SI unit for impulse. The kilogram meter per second is the SI unit for momentum. These momentum and impulse units are the same.
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a parachute slows down the speed of a skydiver. What does the parachute do?
Answer:
BELOW
Explanation:
Basically it adds AIR FRICTION.
A force F~ = Fx ˆı + Fy ˆ acts on a particle that
undergoes a displacement of ~s = sx ˆı + sy ˆ
where Fx = 10 N, Fy = −5 N, sx = 4 m, and
sy = 1 m.
Find the work done by the force on the
particle.
Answer in units of J.
008 (part 2 of 2) 10.0 points
Find the angle between F~ and ~s.
Answer in units of degrees
Make sure answers have all decimal places and are un rounded
The work done by the force on the 35 Joule.
What is work?Work in physics is the energy that is transferred to or from an item when a force is applied along a displacement. In its simplest form, it equals the product of the force's magnitude and the distance traveled for a constant force directed in the direction of motion.
Work = force . distance. In units, Joules = Newtons x meters.
Work = 10.4 + (-5)1
Work = 35 Joule
The work done by the force on the 35 Joule.
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the output voltage of a 78 ww transformer is 14 vv , and the input current is 34 aa . part a is this a step-up or a step-down transformer? is this a step-up or a step-down transformer? the transformer is step-up. the transformer is step-down.
The transformer is step-up because output voltage has higher value.
We need to know about the transformer to solve this problem. Transformer is a device that can increase or reduce the voltage. The changed voltage depends on the current and number of coil turns. It can be written as
Vi / Vs = Ni / Ns = Is / Ii
where Vi is input voltage, Vs is output voltage, Ni is primary turn, Ns is secondary turn, Is i output current and Ii is input current.
From the question above, we know that
P = 78 W
Vs = 14 V
Ii = 34 A
Find the input voltage by using the power of transformer
P = Ii . Vi
78 = 34 . Vi
Vi = 2.29 V
As we know the input voltage is lower than the output voltage. It means that the transformer is included to step up transformer.
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An electric battery provides a current
☐ Alternative
☐ Synchronous
☐ Continuous
☐ Pulsed
Answer:
An electric battery provides a current.. answer is continuous
A central purple circle labeled o has 2 concentric rings. The inner ring has 2 small green spheres. The outer ring has 6 small green spheres. How many additional electrons does this atom of oxygen need in its valence shell to satisfy the octet rule? two four six eight.
This atom of oxygen need two electrons in its valence shell to satisfy the octet rule.
What is octet rule?The octet rule is a rule of thumb in chemistry that reflects the theory that main group elements have eight electrons in their valence shells and tend to bond in the same electronic configuration as the noble gases. increase. The octet rule states that an atom should only have 8 electrons in its full outer shell.
The electronic configuration of oxygen is 1s²2s²2p⁴. Two electrons are required for oxygen to reach the noble gas configuration. According to the octet rule, an oxygen atom must be bonded twice. An O2 molecule has two atoms. That is, two atoms of the same element are bonded in pairs.
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Answer:
its 6 the other person was wrong
Explanation:
What is the vertical acceleration of a dart that is launched horizontally with an initial velocity of 2. 3 m/s?.
A horizontal dart launch with just an initial velocity of 2. 3 m/s accelerates upwards at a rate of -9.8 m/s2.
Explain what an acceleration is.acceleration is the rate of change in both speed and distance of velocity over time. When anything moves faster or slower in a straight line, it is said to have been accelerated.
What is an effective instance of acceleration?An object has positive acceleration when it is going faster than it was previously. Positive acceleration was demonstrated by the moving car in the first scenario. The acceleration is in a direction that is consistent with the way that the vehicle is moving forward and speeding up.
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What is the acceleration of a vehicle that
changes its velocity from 300 km/h to a dead
stop in 20 s ?
Answer:
Explanation:
Given:
ΔV = 300 km/h = 300 000 m / 3 600 s ≈ 83.3 m/s
Δt = 20 s
_____________
a - ?
The acceleration:
a = ΔV / Δt = 83.3 / 20 ≈ 4.2 m/s
consider the three resistors and the battery in the circuit shown. which resistors, if any, are connected in series? g
No resistors are connected in series.
A resistor is a passive two-terminal electrical component used in circuits to implement electrical resistance.
A resistor is an electrical component that controls or restricts how much electrical current can pass across a circuit in an electronic device. Additionally, resistors can be used to supply a particular voltage to an active device like a transistor.
A passive electrical component called a resistor prevents the flow of electric current by introducing resistance. They are present in practically all electrical networks and electronic circuits. Ohms are used to measuring resistance.
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Student 1 claims that energy can only be transferred by particles inside a medium. Student 2 does not agree with Student 1. Which statement should Student 2 use as evidence that Student 1 is INCORRECT? A. Light energy can travel without a medium. B. Sound energy can travel without a medium. C. All types of energy can travel without a medium. D. Mechanical energy can travel without a medium.
Among the incorrect assertions are B. Sound waves can travel by themselves. C. Energy of all kinds can move without a medium. D. Mechanical energy is not dependent on a medium to move (B,C and D).
What causes energy to flow through a medium?Energy is transferred via the vibrations of the electric and magnetic fields in electromagnetic waves. When a sound wave travels through air or a solid medium, air or solid particle vibrations are used to transfer energy. The vibration of the water molecules in water waves transfers energy.
A medium is necessary for mechanical waves to transfer their energy from one place to another. An illustration of a mechanical wave is sound.
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you place a 7/50 kg television set on a spring scale. if the scale reads 78.4 n, what is the acceleration due to gravity at that location?
The acceleration due to gravity is 9.8 m/s^2.
What is gravity?
In mechanics, gravity—also known as gravitation—is the constant force of attraction that pulls all matter together. It has no impact on determining the internal characteristics of common matter because it is by far the weakest known force in nature. In contrast, it governs the structures as well as evolution of stars, galaxies, as well as the entire cosmos through its extensive and universal action, which affects the trajectories of objects in the solar system and throughout the universe. All objects on Earth have a weight, or a gravitational pull downward, proportional to their mass, which is a result of the mass of the planet. The acceleration that gravity gives to objects falling freely serves as a gauge of its strength. The acceleration of gravity at Earth's surface is approximately 9.8 metres (32 feet) per second for every second.
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velma's rocket ship is moving away from mort at a speed of 0.75c. mort fires a laser beam toward her spaceship, observing the tip of the laser beam to move away from him at speed c, according to the predictions of einstein's relativity, velma should observe this laser beam to move past her at a speed of
When Velma’s rocket is moving with 0.75c speed and observing the tip of the laser beam to move away from him at speed c, then Velma should observe this laser beam to move past her at a speed of 0.25C.
What is a Rocket?A rocket is a vehicle that accelerates without using the air around it by using jet propulsion. A rocket engine's reaction to high-speed exhaust is what gives it power. A rocket can fly in the vacuum of space because its engines are totally powered by fuel carried inside the craft.
What is a laser beam?A laser is a device that produces light using an optical amplification technique based on the electromagnetic radiation's stimulated emission.
According to the predictions of Einstein's relativity time dilates in a gravitational field which results in the above outcome.
Hence, when Velma’s rocket is moving with 0.75c speed and observing the tip of the laser beam to move away from him at speed c, then Velma should observe this laser beam to move past her at a speed of 0.25C
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24.11 a capacitor is made from parallel plates with a plate area of .0178 m2 . the plates are placed 0.35 mm apart and filled with a dielectric material. if the capacitance of the capacitor is 1.44 x 10-9 f, what is the dielectric constant of the material?
Using the buildup of electric charges on two neighbouring surfaces that are electrically insulated from one another, a capacitor is a device that stores electrical energy in an electric field. It is an electrical passive component with two terminals. Capacitance is the measurement of a capacitor's effect.
C = ∈oA / d = (8.85 * 10⁻¹² * 0.0178) / (0.35 * 10⁻³)
= 4.5 * 10⁻¹⁰ F
Q = C*V = (4.5 * 10⁻¹⁰ * 27)
= 1.215 * 10⁻⁸ C
E = V / d = 27 / (0.35 * 10⁻³)
= 7.71 * 10⁴ N/C
An electrical energy storage device called a capacitor is made up of two conductors that are situated close to and insulated from one another. A parallel-plate capacitor serves as an easy-to-understand illustration of one such storage device.
In contrast to a battery, a capacitor is a part of a circuit that uses a potential difference created by charged particles distributed between (typically two) plates to temporarily store electrical energy. A capacitor may charge more quickly than a battery and can quickly release all of its stored energy.
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A 4. 00 kg ball is on a 5. 00 m ledge. If it is pushed off the ledge, how much kinetic energy will it have just before hitting the ground?.
The kinetic energy the ball will have just before hitting the ground is 0.196 kJ.
Define kinetic energy in your words?
The energy that an object has because it is moving is known as kinetic energy in physics.
In other words it can be defined as the amount of effort that is required to accelerate a body of a specific mass from rest to its specified velocity is termed as kinetic energy.
The following informations are given in the question,
Mass of the ball, M = 4 kg
Height of the ledge, S = 5 m
Initial velocity of the ball, u = 0 m/s (at rest)
From the third equation of motion, we have
v^2 = u^2 + 2a × S
= 0 + 2 × 9.8 × 5
= 98
v = √(98)
= 9.889 m/s
= 9.9 m/s
Kinetic energy is found out using the formula, E = 1/2 × mass × v^2
Since the initial kinetic energy of the ball is 0 as its initial velocity is 0 or the body was at rest, therefore,
The final kinetic energy of the ball,
Ef = 1/2 × 4 × 9.9^2
= 196 J
= 0.196 kJ
Hence, the kinetic energy the ball will have just before hitting the ground is 0.196 kJ.
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(a) a moving electron has a kinetic energy of 5.53 ev. what is the wavelength of this electron (in m)? m (b) a photon with an energy of 5.53 ev has what corresponding wavelength (in m)? m
By converting the 400 nm wavelength of violet light into meters we are get 4.0.10^-7.
What is wavelength ?
wavelength can be defined as the distance between two successive crests or throughs of a wave. It is measured in the direction of the wave.
The wavelength of light defined as the distance between the two successive crests or throughs of the light wave.
The wavelength of light is the distance between corresponding point in two adjacent light cycles and the frequency.
Convert the unit for 400nm-
4.0.10^-7
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In lab we applied the conservation of energy to a system to allow us to equate the initial energy to the final energy. How does the initial energy become stored in the system?.
Due to its position, an object has the ability to store energy. The initial energy that is stored in the system is provided by the tension in the string.
In physics, what is energy?The ability to exert an force that causes an item to move is what is meant by the definition of energy as the "power to accomplish work." Even though the definition is unclear, the meaning is clear: energy is simply the force that moves things. Potential energy and kinetic energy are the two categories of energy.
Why is energy so crucial?Because it is a fundamental human requirement, energy plays a significant role in our daily lives. Our human-made structures are not only heated by energy, but also cooled by it. Even lifting a finger requires energy, as does getting out of bed and going outside.
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George has a mass of 65kg. What would george weigh on the moon? (the gravitational field strength on the moon is 1. 6n/kg. ).
George's weight on the moon is 104 N.
A gravitational field is a version used to give an explanation for the influence that a huge body extends into the gap around itself, producing a force on another huge frame. thus, a gravitational subject is used to provide an explanation for gravitational phenomena and is measured in newtons in step with kilogram.
That is a manner of measuring how a good deal of gravity there is. The method is weight/mass = gravitational discipline strength. on earth, the gravitational area energy is 10 N/kg.
Calculation:-
Given,
George's mass = 65kg
Gravitational field strength on the moon = 1. 6 N/kg
Then, the weight of George on the Moon = Mass x Gravitational field strength
= 65 x 1.6
= 104 N
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Explain what could be a mechanism by which jendrassik maneuver produces bigger myotatic reflex.
The Jendrassik maneuver (JM) is a method for enhancing sluggish tendon-tap during the examination. The tendon tap reflex is used to assess the state of the monosynaptic reflex through the spinal cord.
This is due to enhanced gamma efferent discharge to the muscle spindle. Protective measures for the muscles, in order to prevent tearing that can occur due to vigorous movement. Once the muscle spindle is stretched, the impulse is sent back to the muscle very quickly and protects it from being pulled forcefully or beyond its normal range of motion.
The Jendrassik maneuver is a clinical maneuver in which the patient clenches the enamel, flexes each set of arms right into a hook-like form, and interlocks the one's sets of arms together. The tendon beneath the patient's knee is then hit with a reflex hammer to elicit the patellar reflex.
The Jendrassik maneuver may also exaggerate spinal reflexes including the patellar reflex. explain. the Jendrassik maneuver reduces activity in normal brain stem descending inhibitory pathways that manipulate spinal reflex neurons. a discount in inhibition on the spinal level may additionally lead to myotatic reflex responses.
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Many scientists suspect that Venus has a stronger and thicker lithosphere than Earth. If this is true, which of the following could explain it?
A. The high surface temperature that has "baked out" all the liquid water from Venus's crust and mantle.
B. The slow rotation of Venus.
C. The smaller size of Venus, which has allowed it to lose much more internal heat than Earth.
D. The apparent lack of plate tectonics on Venus.
Many scientists suspect that Venus has a stronger and thicker lithosphere than Earth. Option A. The high surface temperature "baked out" all the liquid water from Venus's crust and mantle which could explain this.
The crust of Venus appears to be almost entirely volcanic and basaltic. there is not anything there like Earth's continents—no granitic rocks in any respect, high in silicon and oxygen.
Venus's crust appears to be 70 kilometers (43 mi) thick and composed of silicate rocks. Venus's mantle is approximately 2,840 kilometers (1,760 mi) thick, its chemical composition might be similar to that of chondrites. Venus' floor isn't an unmarried, solid “lithosphere”, as as soon thought, however, it is a patchwork of tectonic plates with a similar pastime to – but not the same as – the ones here on this planet
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When placing cold water into a hot pot to boil what happens to the energy to the cold water as it starts to boil?
Since heat flows from the hot pot to the cold water, the total energy of the cold water will decrease.
Since heat flows from the hot pot to the cold water, the total energy of the cold water will increase.
Since heat flows from the cold water to the hot pot, the total energy of the cold water will increase.
Since heat flows from the cold water to the hot pot, the total energy of the cold water will decrease.
Answer:Since heat flows from the cold water to the hot pot, the total energy of the cold water will decrease
Explanation:
Answer:Since heat flows from the hot pot to the cold water, the total energy of the cold water will increase.
Explanation:
how to get to meausre density, volume or mass