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Physics Questions and Answers October 14, 2019

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A very fast train with a proper length of 5 6 0 m is passing through a tunnel that is 1 1 1 m long according to observers on the ground. Imagine the train s speed to be so great that the train fits completely within the tunnel as seen by observers on the ground. What is the train s speed in terms of speed of light c ?

Consider the wave equation:y ( x , t ) = Asin ( kx - wt ) It provides information about which of the following:A . The frequency of the waveB. The wavelength of the waveC. The time period of the waveD. The wave velocityE. All of the above

If the maximum tension in the simulation is 1 0 . 0 N , what is the linear mass density ( m / L ) of the string?

A soccer ball is kicked from the ground towards the goal at 2 4 . 0 m per sec at an angle of 6 up from the horizontal. If the play kicks the ball 3 5 meters from the goal and the goal is 2 . 4 4 m high, does the ball end up in the goal before it touches the ground again?
A soccer ball is kicked from the ground towards

If the radius in which an object moves in uniform circular motion is tripled while the speed remains constant, the centripetal force is multiplied by a factor of _ _ _ _ . Multiple Choice 1 9 1 3 1 3 9

A bat can emit an ultrasound chirp at frequency of 2 5 kHz . While you are moving away with the speed of 2 2 m s from the bat, and the bat fly away from you with the speed of 5 6 m s ( opposite direction ) . Can you hear the bat's chirp if you are able to hear the chirps at 2 0 kHz ? If yes, with what frequency? ( The velocity of the sound in air
A bat can emit an ultrasound chirp at frequency

In the figure, a rectangular glass block with a height of h = 4 1 m and an index of refraction n = 3 . 0 is shown. A light ray is incident on the top surface of the glass at an incident angle = 5 8 . Find the displacement x ( perpendicular to the incident ray direction ) as the ray exits the bottom surface of the glass. Express your answer in
In the figure, a rectangular glass block with a

A metal bar in a low temperature physics experiment with mass m = 9 2 kg had its temperature raised from T 1 = 2 8 K to T 2 = 4 1 K . The metal bar has a specific heat that is a function of temperature: c ( T ) = A + T where A = 4 4 0 J / ( kg K ) and = 1 1 J / ( kg K 2 ) . Note the metal bar does not change in volume as it is heated.Calculate the

problem 1 atherosclerosis Donald aorta is 8 cm long and in the absence of any plaque buildup has the radius of 1 cm the viscosity of blood is 1 0

If 5 0 0 J of work are required to carry a 5 0 - C charge from one point to another, the potential difference between these two points is: Group of answer choices 2 5 0 0 V 1 0 V none of these depends on the path 1 2 . 5 V

A diver running 2 . 3 m s dives out horizontally from the edge of a vertical cliff and 2 . 7 s later reaches the water below.
A diver running 2 . 3 m s dives out horizontally

You have 4 particles of air roaming around. Which one has the lowest temperature? Particle 3 , v = 2 m s Particle 4 , v = 2 0 m / s Particle 1 , v = 5 m s Particle 2 , v = 1 2 m / s
You have 4 particles of air roaming around. Which

A disc rolls down along a titled plane. Does fiction do work

In summary, whether you a permanent magnet. and forth, or switch an electromagnet and , you are a magnetic field with time and thereby producing an field.

In a Young's double - slit experiment the wavelength of light used is 4 6 8 nm ( in vacuum ) , and the separation between the slits is 2 . 4 \ times 1 0 - 6 m . Determine the angle that locates ( a ) the dark fringe for which m = 0 , ( b ) the bright fringe for which m = 1 , ( c ) the darkfringe for which m = 1 , and ( d ) the bright fringe for

Salt water has a higher density than fresh water. A person ( constant weight ) floating at the surface in salt water and fresh water will: Question 1 0 options: Experience a buoyant force which is greater than the person's weight in salt water. Displace a smaller volume of fluid in salt water than in fresh water ( and will therefore float higher

The dimension of the container that holds the blue liquid that you cannot see ( into the screen ) is 0 . 1 m . The density of the liquid is 1 3 , 6 0 0 kg / m 3 . What is the volume of the liquid? What is the mass of the liquid?

If the lightbulb has a resistance of 1 , what is the potential at point 3 . In the circuit below, the negative terminal of the battery is grounded. Group of answer choices 3 V 2 V 0 V 9 V 6 V

What is Wg , the work done on the block by the force of gravity w w as the block moves a distance LL = 4 . 8 0 mm up the incline?

On the planet arrakis, a male bird flies towards a female at a speed of 2 6 . 0 m / s while singing at a frequency of 1 2 0 2 Hz . The female is at rest and hears a sound with a frequency of 1 2 6 0 Hz . What is the speed of sound in the atmosphere of the planet arrakis ?

If he decides to have his explorers weigh the same on this planet as on earth, what should its average density be ? Express your answer in terms of the earth's density c .
If he decides to have his explorers weigh the

If you were able to lift the board by its end, with your fingers extending 4 inches under the board, what is the minimum force your fingers would have to exert? Hint - > 1 . your hand force is not 1 0 ft away, it is a bit closer 2 . The weight of the board acts at the center, this is true for most objects 3 . How many forces are acting on the

Electromagnetic radiation is emitted by accelerating charges. The rate at which energy is emitted from an accelerating charge that has charge qq and acceleration aa is given by dEdt = q 2 a 2 6 0 c 3 dEdt = q 2 a 2 6 0 c 3 where cc is the speed of light. If a proton with a kinetic energy of 6 . 3 MeVMeV is traveling in a particle accelerator in a

EXTRA CREDIT: Consider a long straight wire carrying a sinusoidal current \ ( I ( t ) = I _ { 0 } \ sin ( \ omega t ) \ ) . In the plane of the wire is a square loop of edge length ' a ' and at distance ' d ' from the wire, as shown. a . Solve for the current in the loop, assuming the wire of the loop has a resistance R . b . When the current I is
EXTRA CREDIT: Consider a long straight wire

A glass of ice water containing nine ice cubes will be colder than a similar - size glass of ice water containing only three ice cubes. Group of answer choices True False

You are given that the acceleration of gravity on Earth is g . If a planet had twice the earth's radius, but only half its mass, the acceleration due to gravity at its surface would beG 4 g ( 1 ) / ( 2 ) g 1 / 8 g

Two nuclei each contain two protons and exert a force 4 N on each other. If we transfer a proton from one of these nuclei to the other, the force on each nucleus is now reduced to 3 N Group of answer choices True False

Write down the Hamiltonian for a solid cylinder ( mass , radius , and moment of inertial = 1 2 2 ) that rolls without slipping straight down an inclined plane which is at an angle from the horizontal. Use the cylinders distance measured down the plane from its starting point as your generalized coordinate. Write down the Hamiltons equation and

Rank each circuit on the basis of the current through the battery just after the switch is closed. Largest 1 . _ _ _ _ _ 2 . _ _ _ _ _ 3 . _ _ _ _ _ 4 . _ _ _ _ _ 5 . _ _ _ _ _ 6 . _ _ _ _ _ Smallest _ _ _ _ _ The ranking cannot be determined based on the information provided. Explain the reason for your ranking: b . Rank each circuit on the basis

How much energy ( in J ) becomes unavailable to do work because of this increase in entropy, assuming an 1 8 . 0 C lowest temperature? ( Part of Qc could be utilized to operate heat engines or for simple space heating, but it rarely is . ) J

One mole of an ideal gas is sealed in a container at constant volume. If the temperature ( T ) is increased to 4 T , the pressure ( P ) will: Group of answer choices decrease to 1 / 4 P . increase to 1 / 4 P . remain at P . decrease to 4 P . increase to 4 P .

An object experiences a net torque of 0 N * * m and net force of 1 . 2 N . Is the object in equilibrium? Yes No
An object experiences a net torque of 0 N * * m

using correct units, interpret the meaning of M ' ( 1 5 ) = - 1 7 1 in the context of the problem

What is the resistance of a 5 0 - cm long lenght of this wire?
What is the resistance of a 5 0 - cm long lenght

A particle moving along the xx - axis has its position described by the function x = ( 3 t 3 + 2 t + 1 ) mx = ( 3 t 3 + 2 t + 1 ) m , where tt is in ss . For help with math skills, you may want to review: Differentiation of Polynomial Functions Part A At tt = 4 ss , what is the particle's position? Express your answer with the appropriate units.

what is the electric potential 1 8 . 0 cm from a 4 0 0 uC point charge

When light from a mercury lamp ( = 5 4 6 . 1 nm ) is incident on a particular metal surface, the stopping potential is 0 . 9 7 8 V . ( a ) What is the work function ( in eV ) for this metal? Apply the photoelectric effect equation. What is the energy in eV required to raise an electron through a 1 - V potential? eV ( b ) What stopping potential (

The far point of a nearsighted person is 7 . 7 m from her eyes, and she wears contacts that enable her to see distant object early

This is a strong, short - lived magnet created by a looped electrical current.
This is a strong, short - lived magnet created by

An isolated air - filled parallel - plate capacitor that is no longer connected to anything has been charged up to Q = 2 . 9 nC . The separation between the plates initially is 1 . 2 0 mm , and for this separation the capacitance is 3 1 pF . Calculate the work that must be done to pull the plates apart until their separation becomes 5 . 3 0 mm ,

How does the buoyant force of a submerged object compare to the weight of the water displaced? a . The buoyant force is equal to the weight of the water displaced b . Assuming that the submerged object is more dense than water the buoyant force will be less than the weight of water

A child on a swing set swings back and forth with a period of 2 . 4 s and an amplitude of 2 5 . Suppose that the motion is simple harmonic.
A child on a swing set swings back and forth with

a uniform ladder of mass 2 0 kg leans against a frictionless wall. it is noted that 5 9 . 0 is the minimum angle the ladder can make with the floor without slipping. What is fhe coefficient of static friction

The expansion of space causes a change in the spectrum of a galaxy, similar to the change that the Doppler shift causes in the spectrum of a star.

describe dry friction. What direction does the friction force act with respect to the direction of motion? Describe impending motion. [ 5 pts ]

Consider a uniform solid sphere of radius R and mass M . A particle might be placed At a distance R 3 from the center of the sphere. At a distance R 2 from the center of the sphere. At ? 3 distance R from the center of the sphere. At a distance 2 R from the center of the sphere Rank these situations according to the magnitude of the gravitational
Consider a uniform solid sphere of radius R and

4 1 . ( a ) An x - ray photon has momentum = 6 . 5 e - 2 1 J * s / m . What is its wavelength? ( b ) Calculate its energy in MeV. ( energy )

An electron is trapped in a finite well. How far ( in eV ) is it from being free if the penetration length of its wavefunction into the classically forbidden region is 1 nm ?

A resistance temperature detector ( R TD ) provides a resistance output that 1 s related to temperature by:

Stretching a certain spring 0 . 1 0 mm from its relaxed length requires 1 6 JJ of work.

You stand on the roof of an 8 2 m tall building. If you throw a ball at 3 . 8 m / / s at an angle of 2 5 degrees above horizontal, what are the x and y components of the velocity right before the ball hits the ground?
You stand on the roof of an 8 2 m tall building.

4 4 Problem: A point charge 5 nC is located at the origin. What is the total electric flux through a hemispherical shell which has its center at the origin? 5 . 6 5 E + 0 2 N m 2 C 2 . 8 2 E + 0 2 N m 2 C 2 . 8 2 E + 1 1 N m 2 C 5 . 6 5 E + 1 1 N m 2 C 1 . 4 1 E + 0 2 N m 2 C
4 4 Problem: A point charge 5 nC is located at

The acceleration of an oscillator undergoing simple harmonic motion is described by the equation ax ( t ) = ( 1 6 m / s 2 ) cos ( 3 3 t ) where the time t is measured in seconds. What is the amplitude of this oscillator?

A radio telescope has an angular resolution of 0 . 1 3 0 for incident radio waves of wavelength = 3 . 5 3 mm . What is the minimum diameter ( in m ) required for the telescope's parabolic receiving dish? m What If ? The 2 1 . 1 cm line, corresponding to emissions from hyperfine transitions in hydrogen, plays an important role in radio astronomy. (

What is the gardener s displacement see the figure below Give a general direction such as south or west Hint Think of a 3 4 5 triangle Pythagorean theorem Distance meters 5 Distance meters magnitude direction south of east v

A hydrogen atom is in its ground state ( ni = 1 ) when a photon impinges upon it . The atom absorbs the photon, which has precisely the energy required to raise the atom to the nf = 3 state. ( a ) ( a ) What is the initial quantum number, ni , of the transition that generates the photon with the longest wavelength? ( Restrict your attention to the

1 ) The same cylinder is weighed using a force probe and has weight in air W = 0 . 2 2 5 N . It is then submerged in water ( f = 1 0 0 0 kg / m 3 ) where the force probe measures Tf = 0 . 1 4 6 N . Calculate the density of the cylinder. This calculation is Method 3 in the procedure

How fast must a plane 5 0 m long travel to be found by observers on the ground to be 0 . 1 0 nm shorter than 5 0 m ?

Radio station WCCO in Minneapolis broadcasts at a frequency of \ ( 8 . 3 0 \ times 1 0 ^ { 5 } \ mathrm { ~Hz } \ ) . At a point some distance from the transmitter, the magnetic - field amplitude of the electromagnetic wave from WCCO is \ ( 5 . 0 8 \ times 1 0 ^ { - 1 1 } \ mathrm { ~T } \ ) . Part A Find the wavelength. Express your answer in
Radio station WCCO in Minneapolis broadcasts at a

sound travela about 5 0 0 0 ft / s in seawater. if a sonar device sent a sound straught down to the bottom of the sea and the returning echo was heard 0 . 5 s later, how deep was the ocean?

Consider a battery with an emf of and internal resistance of r . The battery is initially connected to a resistor circuit that has an equivalent resistance of R . If the equivalent resistance of the resistor circuit increases, what happens to the terminal voltage and the current drawn from the battery? You may assume that the internal resistance

What type of wave oscillates parallel to its direction of motion? Transverse Stationary Periodic Water Longitudinal
What type of wave oscillates parallel to its

Stars with a solar mass greater than 3 . 0 will eventually become a galaxy. a white dwaft. a black hole. a neutron star.
Stars with a solar mass greater than 3 . 0 will

( II ) An ideal monatomic gas, consisting of 2 . 5 mol of volume 0 . 0 8 6 m 3 , expands adiabatically. The initial and final temperatures are 2 5 C and - 6 8 C . What is the final volume of the gas?

( 2 0 ) BONUS ( Must get all correct ) . ( a ) ( 1 0 ) What is the event horizon radius [ m ] for the sun if it were to collapse to a Schwarzschild black hole? ( Msun = 1 . 9 9 x 1 0 3 0 kg ) . ( 1 0 ) Would Earth s orbit be altered if this were to occur and why?

Light waves can travel in the absence of a medium because the things doing the "waving" are Question 1 9 options: electric and magnetic fields. air molecules. gravitational fields. charged particles throughout the region between the source and receiver.

Which of the following follows a geodesic in curved spacetime? An object in orbit around a star. A photon traveling through space. A rocket accelerating itself out a planet's gravitational potential. All of the above. Only A and B .

When Sandra is at the bottom of the Ferris wheel's rotation, how does the magnitude of the normal force N exerted on her by her seat compare to her weight m g ? N = 1 2 m g N > m g N = m g N N = 1 2 m g N > m g N = m g
When Sandra is at the bottom of the Ferris

A block of mass m = 0 . 2 k g on a ramp with negligible friction is pressed against a spring with spring constant k = 8 0 0 N m , compressing it a distance x = 0 . 1 m . The block is then released and travels up the ramp. What is the height of the block above its initial height when it has speed v = 5 . 0 m s ? 0 . 7 5 m 1 . 5 m 2 . 0 m 3 . 2 5 m

What happens if you double the temperature of a blackbody? Group of answer choices The emitted radiation gets more intense and peaks at a shorter wavelength. The emitted radiation gets more intense but the wavelength of peak emission does not change. The intensity of the emitted radiation does not change but peaks at a shorter wavelength. Neither

What are the center frequencies of the two 1 / 3 - octave bands adjacent to the 1 / 3 octave band centered at 1 0 0 0 Hz ? If the sound pressure levels of these 3 bands are 6 2 , 6 5 and 6 7 dB , what is the corresponding sound pressure level for the octave band centered at 1 0 0 0 Hz ?

1 0 - d 1 Adrinking straw works because, when you suck air out of the straw, there is decreased pressure. The equilibrium water level inside the straw is such that the pressure at the water level outside the straw ( atmospheric pressure ) is equal to the pressure at the same height inside the straw. Inside the straw, there are two contributions:

Orange light of wavelength in air enters a block of glass with . What color would it appear to a sensor embedded in the glass? The wavelength ranges of colors are violet ( 0 . 3 9 to ) , blue ( 0 . 4 5 to ) , green ( 0 . 4 9 to ) , yellow ( 0 . 5 8 to ) , orange ( 0 . 6 0 to ) , and red ( 0 . 6 2 to ) .

an ice cream has a mass of 2 2 0 0 gram. if the specific latent heat of fusion of ice is 4 1 0 0 0 J kg - 1 , find the heat required to melt the ice cream

As simple harmonic oscillator consist of 8 kg block attached to a spring with a spring contest of 1 0 0 N / m .

Which value of absolute zero is closest to the value determined from your data?

suppose you have different colored bubls:red:green:yellow, and orange A ) which of the bulbs, if any emit photons of longest wavelength B ) which of the bulbs of any emit the highest energy photns C ) which of the bulbs id any emit photons of the lowest frequency

Suppose a satellite has a mass of 1 9 0 0 kg and is orbiting at 7 . 8 km / s . Use the approximation that 1 + ( 1 / 2 ) ( v 2 / c 2 ) at low velocities. find the fractional difference

BaTiO: is a perovskite feroelectric single crystal. This material couldbe in a tetragonal phase ( spontaneous polarization P in directions ) , anorthorhombic phase ( spontaneous polarization P in directions ) , or arhombohedral phase ( spontaneous polarization Pin directions ) . depending on the temperature T in Kelvin. According to the Landau

Two parallel conducting plates, each of area 0 . 6 m ^ 2 , are separated by a distance of 5 * 1 0 ^ - 2 and a piece of plastic with a dielectric constant k = 2 . 1

The magnetic force per meter on a wire is measured to be only 4 5 % of its maximum possible value.

The LC circuit of a radar transmitter oscillates at 1 0 . 3 GHz . ( a ) What inductance is required for the circuit to resonate at this frequency if its capacitance is 4 . 9 0 pF ? pH ( b ) What is the inductive reactance of the circuit at this frequency?

VI . Describe a heat engine.
VI . Describe a heat engine.

The figure below shows the position vs . time plot of an object moving in one dimension. The numerical values of the points marked are: A = - 3 4 . 7 , B = 5 8 , C = 1 4 . 4 , and D = 2 3 . 5 What is the acceleration at t = 1 8 . 0 s ( i n m s 2 ) ? x ( m )
The figure below shows the position vs . time

Question 6 1 pts A projectile is ejected from a 2 5 - m high tower with a velocity of 4 0 m s at an angle of 3 0 degrees to the horizontal first on Earth and then on Mars. What is the ratio of the time taken to hit the ground on Mars compared to Earth? ( Assume g M a r s = 0 . 3 8 g E a r t h ) 2 . 4 2 . 6 0 . 3 8 6 . 9 1 . 0
Question 6 1 pts A projectile is ejected from a 2

( b ) Suppose you replace the given particle with another that has identical charge but 1 . 5 x mass. Do you need to change anything about the \ ( B , E \ ) fields to make the cyclotron speed this particle up to the same final velocity? Justify your answer. Hint: consider both timing and spatial dimensions.
( b ) Suppose you replace the given particle with

What is the final velocity of a hollow cylinder that rolls without slipping down a 1 0 . 0 m high hill, starting from rest?
What is the final velocity of a hollow cylinder

A 6 5 . 0 - kg woman descends in an elevator that briefly accelerates at 1 . 9 6 m / s 2 downward. She stands on a scale that reads in kg . ( a ) During this acceleration, what is her weight and what does the scale read? 5 2 . 0 kg ( b ) What does the scale read when the elevator descends at a constant speed of 2 . 0 0 m / s ? 6 5 . 0 kg ( c )

The figure below shows a six - string guitar and the distance between the bridge and the fret closest to the bridge. ( i ) ( a ) When the thinnest string is pressed down at the fret closest to the bridpe ( d = 2 0 . 5 c m ) and the string plucked near the midpoint, the vibrating string produces a sound with a frequency of 2 , 3 8 0 H z . If the
The figure below shows a six - string guitar and

When a cylindrical capacitor is given a charge of 0 . 5 0 0 nC , a potential difference of 2 0 . 0 V is measured between the cylinders. ( a ) What is the capacitance of this system? ( b ) If the cylinders are 1 . 0 m long, what is the ratio of their radii?

At rest, a proton gains kinetic energy through an electric potential of 1 . 0 kV and enters a uniform magnetic field with intensity 0 . 0 4 0 T . At this point, what is the radius of the orbit that the proton draws? ( The mass mproton = 1 . 6 7 1 0 - 2 7 kg , the charge e of the proton = 1 . 6 0 1 0 - 1 9 C )

Question 3 1 pts What does the 2 3 5 represent in uranium 2 3 5 ? the atomic number none of the above the neutron number the mass number
Question 3 1 pts What does the 2 3 5 represent in

A 2 0 0 0 kg car moving at 1 0 m s breaks to a stop in 1 0 seconds. What is the total change in the car's momentum? 0 2 0 0 kgm / s 2 0 0 0 kgm / s 2 0 0 0 0 kgm / s None of these
A 2 0 0 0 kg car moving at 1 0 m s breaks to a

A transverse wave on a string is described byy ( x , t ) = ( 2 . 2 0 cm ) sin [ ( 1 3 0 rad / s ) t + ( 1 5 rad / m ) x ] Find the ( a ) amplitude, ( b ) wavelength, ( c ) frequency, and ( d ) wave speed of this wave. ( e ) In what direction does the wave travel? ( f ) What is the maximum acceleration of a point on the string?

A submersible vehicle is in a lake at a depth of 2 6 . 8 m . What is the absolute pressure ( in Pa ) at this depth? The density of the water in the lake is 1 . 0 0 1 0 3 kg / m 3 , and the air above is at a pressure of 1 0 1 . 3 kPa. Pa ( b ) The submersible vehicle has a circular window with a diameter of 3 8 . 0 cm . What force ( in N ) is

Some radar systems can detect the size and shape of objects such as aircraft and geological terrain. Randomized Variables f = 5 1 0 MHz trenton.lane@uky.edu 9 K 8 9 - 7 0 - 1 F - 4 2 - 8 4 8 A - 5 5 3 7 2 What is the approximate size d , in meters, of the smallest observable detail when using 5 1 0 - MHz radar? d = |

a 7 0 kg skier starts from rest and goes down a 5 0 m long, 1 0 degree slope. Using the coefficient of friction between the wood skis and snow, what is his speed at the bottom. ( solve using conservation of energy )

The same effect is not observed when white light from a light bulb is used. Explain why white light doesn t produce a fringe pattern.

magnitude T direction - - Select - - -
magnitude T direction - - Select - - -

A mass on the end of string acts a pendulum with a period of 0 . 7 s . What is the period of the oscillation if ( a ) the mass doubles, ( b ) the length of the string doubles, ( c ) the string length halves

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