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Physics Questions and Answers November 02, 2019

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The heat of vaporization of water is 5 4 0 cal / g , and the heat of fusion is 8 0 cal / g . The heat capacity of liquid water is 1 cal g 1 K 1 , and the heat capacity of ice is 0 . 5 cal g 1 K 1 . What amount of heat is required to evaporate 2 5 g of water at 1 0 0 C . Correct response: 1 3 , 5 0 0 cal 5 . 0 % 6 8 g of ice at - 1 7 C is heated

Newton's second law can be interpreted based on Newton's first law. True False
Newton's second law can be interpreted based on

A light source emits a beam of photons each of which has a momentum of 5 . 1 x 1 0 ^ - 7 kg m / s what then is the energy of one source of those photons

Sam, whose mass is 7 6 kg , takes off across level snow on his jet - powered skis. The skis have a thrust of 2 0 0 N and a coefficient of kinetic friction on snow of 0 . 1 . Unfortunately, the skis run out of fuel after only 1 2 s . Part A What is Sam's top speed? Express your answer with the appropriate units. Subret Previous Answers Correct Part
Sam, whose mass is 7 6 kg , takes off across

Both wires in the figure below have a 2 . 5 A current coming out of the page. ( The permeability of free space is 0 = 4 1 0 - 7 N s 2 C 2 . ) ( a ) Find the magnetic field vec ( B ) exactly 5 cm to the right of the right wire. ( b ) Find the magnetic field vec ( B ) exactly 5 cm to the left of the left wire. ( c ) Where on the axis that connects
Both wires in the figure below have a 2 . 5 A

Question 2 The potential energy for a spring or other elastic material is what kind of function? Linear Quadratic Quartic Cubic
Question 2 The potential energy for a spring or

Current Attempt in Progress For a rigid body rotating with angular velocity about a fixed axis through pd st O the kinetic energy is T = ( 1 2 ) I 0 v 2 . T = ( 1 2 ) I O v . T = ( 1 2 ) l 0 2 . T = ( 1 2 ) I 0 .
Current Attempt in Progress For a rigid body

Nuclides with a low N / Z ratio have

The electron drift speed in a 1 . 0 0 - mm - diameter gold wire is 5 . 5 0 1 0 - 5 m s . Part A How long does it take 1 mole of electrons to flow through a cross section of the Express your ans'wer in days. View Available Hint ( s ) t = , days Incorrect; Try Again; 5 attempts remaining Provide Feedback
The electron drift speed in a 1 . 0 0 - mm -

A heat engine is being designed to have a Carnot efficiency of 7 6 % when operating between two heat reservoirs. ( a ) If the temperature of the cold reservoir is 1 8 C , what must be the temperature of the hot reservoir? C ( b ) Can the actual efficiency of the engine be equal to 7 6 % ? YesNo

An electron moves through a uniform electric field E = ( 2 . 3 0 + 5 . 2 0 ) V / m and a uniform magnetic field B = 0 . 4 0 0 T . Determine the acceleration of the electron when it has a velocity v = 7 . 0 m / s . ( Give each component in m / s 2 . )

Assume the amplitude of the electric field in a plane elec - tromagnetic wave is E 1 and the amplitude of the magnetifield is B 1 . The source of the wave is then adjusted so that the amplitude of the electric field doubles to become 2 E 1 . ( i ) What happens to the amplitude of the

In a certain cyclotron a proton moves in a circle of radius 0 . 5 4 0 m . The magnitude of the magnetic field is 1 . 3 0 T . ( a ) What is the oscillator frequency? ( b ) What is the kinetic energy of the proton? ( a ) Number i Units V ( b ) Number Units v

The number density in a container of argon gas is 2 . 0 5 * 1 0 ^ 2 5 m - 3 . The atoms are moving with an rms of 4 9 1 m / s . What is the pressure inside the container?What is the temperature inside the container?

A boy opens a 1 . 5 0 m wide door by pushing on it with a force of 4 3 . 5 N applied at the center of the door, at an angle perpendicular to the doors surface.

A ball of mass 8 . 5 g with a speed of 2 1 . 7 m / s strikes a wall at an angle 3 0 . 0 o and then rebounds with the same speed and angle. It is in contact with the wall for 4 4 . 0 ms . What is the magnitude of the impulse associated with the collision force? 0 . 3 1 9 1 kg ms What is the average force exerted by the ball on the wall? 7 . 2 7 N

Is the center of mass of this dumbell at point 1 , 2 or 3 ? Explain . Left end is plastic and the right end is steel. Each point is along the handle from left to right.

The time variation of the current in a 3 7 . 0 Mh inductor is given by I = 3 + 4 t - 2 t 2 , with I in amperes and t in seconds. What is the magnitude of the emf induced in the inductor at ( a ) t = 2 s and ( b ) t = 5 s ? ( c ) for what value of t is the emf induced in the inductor 0 .

A neutron may decay radioactively into a proton, an electron, and a neutrino ( n p + e + u ) . How much kinetic energy is released and shared by the reaction products? ( the mass of neutrino is zero ) a ) 9 4 0 MeV b ) 9 3 8 MeV ( 5 ) 0 . 7 8 3 MeV 1 . 0 0 8 0 6 5 > 1 . 0 0 7 2 7 6 + 0 . 0 0 0 5 4 8 d ) 0 . 5 1 0 MeV e ) 1 . 2 9 MeV
A neutron may decay radioactively into a proton,

Which force can be expressed in terms of potential energy? Non - conservative Conservative Frictional Tension
Which force can be expressed in terms of

If the bulk modulus for liquid A is twice that of liquid B , and the density of liquid A is one - half of the density of liquid B , what does the ratio of the speeds of sound in the two liquids ( v A v B ) equal? Example 1 3 - 4

At what angle will 5 0 1 nm light produce a second - order maximum when falling on a grating whose slits are 1 . 0 2 1 0 - 3 cm apart.

I have 2 6 0 0 0 0 MWh requirement from solar Panel and each pannel is rated 4 4 0 W . Calculate how many panels Are required

Find the tension in the Cables for the figure below:
Find the tension in the Cables for the figure

cylindrical region contains a uniform electric field that is parallel to the axis and is changing with time. If r is the distance from the cylinder axis the magnitude of the magnetic field outside the region is: A ) zero B ) proportional to 1 / r C ) proportional to r 2 D ) proportional to 1 / r 2 E ) proportional to r 9 . A 0 . 7 0 - m radius

When the rod is withdrawn, what is the net charge on the electroscope? Why does the vane repel?

In the movie THEM! What resource do the giant ants target during each of their raids?

A small loop of wire of radius 1 . 9 cmcm is placed at the center of a wire loop with radius 2 7 cmcm . The planes of the loops are perpendicular to each other, and a 9 . 0 A A current flows in each.

The electric flux through a cubical box 8 . 0 cm on a side is 1 . 2 1 0 3 N m 2 / C . 1 . 2 1 0 3 N m 2 / C . What is the total charge enclosed by the box?

Consider the following three objects, each of the same mass and radius: ( 1 ) a solid sphere ( 2 ) a solid disk ( 3 ) a hoopAll three are released from rest at the top of an inclined plane. The three objects proceed down the incline undergoing rolling motion without slipping. In which order do the objects reach the bottom of the incline? All three

In the RLC circuit, your resonant frequency was _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ Hz . 0 . 0 7 2 Hz 0 . 1 0 Hz 0 . 2 3 Hz 0 . 5 2 Hz 1 . 4 Hz

Why is the surface of the Earth not precisely an inertial frame? a ) The Earth is round b ) The Earth is too big . c ) The Earth is tilted d ) The Earth is rotating .

When the plutonium bomb was tested in New Mexico in 1 9 4 5 , approximately 1 gram of matter was converted into energy. Suppose another bomb is tested, and 9 . 6 grams of matter are converted into energy. How many joules of energy are released by the explosion?

Consider a house with no windows or doors! The surface area of the walls is 1 2 0 m 2 and their inside surface is at a temperature of 1 8 . 0 C while their outside surface is at 5 . 0 0 C . ( a ) Calculate the rate of heat conduction through house walls that are 1 3 . 0 cm thick and that have an average thermal conductivity twice that of glass

Finally, we'll be including questions on Unit III material to help prepare you for topics you may encounter in the cumulative portion of the Final Exam. So think back to what you already know to answer the following questions: Two different fluids of different densities are placed into two different U - tubes ( 1 and 2 ) . The left branch of each

A parallel - plate capacitor is formed from two 2 . 6 cm - diameter electrodes spaced 2 . 0 mm apart. The electric field strength inside the capacitor is 6 . 0 1 0 6 N C . Part A What is the magnitude of the charge ( in nC ) on each electrode? Express your answer in nanocoulombs. Q = nC Incorrect; Try Again; 5 attempts remaining
A parallel - plate capacitor is formed from two 2

An eye is corrected by a - 3 . 0 0 D lens, 1 . 9 cm from the eye. Part A Is this eye near - or farsighted? Previous Answers Correct Part B What is this eye's far point without glasses? F P = cm Previous Answers Request Answer
An eye is corrected by a - 3 . 0 0 D lens, 1 . 9

A coil with 3 4 0 0 turns and radius 5 cm is connected to an oscilloscope ( see figure below ) . You move a bar magnet toward the coil along the coil's axis, moving from 3 8 cm away to 3 0 cm away in 0 . 2 s . The bar magnet has a magnetic moment of 0 . 8 A * m 2 . ( a ) What is the approximate magnitude of the signal observed on the oscilloscope?
A coil with 3 4 0 0 turns and radius 5 cm is

Question 2 9 ( 5 points ) Chapter 8 : Two friends are riding a roller - coaster. Their combined mass, along with the cart is 2 5 0 kg . They begin at the top with speed of zero. After traveling along the track, they have a final speed of 1 5 m s . ( See diagram ) What is the increase in thermal energy for the system?
Question 2 9 ( 5 points ) Chapter 8 : Two friends

A concert loudspeaker suspended high off the ground emits 3 2 W of sound power. A small microphone with a 1 . 0 c m 2 area is 4 0 m from the speaker.
A concert loudspeaker suspended high off the

1 pt An astronaut on a spaceship traveling at a speed of 0 . 9 0 7 c is holding a meter stick parallel to the direction of motion. If an observer on Earth could observe the meter stick, what would be the length of the meter stick as measured by that observer? ( in m )
1 pt An astronaut on a spaceship traveling at a

8 A good radiograph is taken with 2 0 mAs , using a certain technique. If you increase distance by a factor or 2 , decrease the grid from 5 : 1 to table top, and decrease kV by 1 5 % what will the new mAs be in order to maintain exposure?
8 A good radiograph is taken with 2 0 mAs , using

Three capacitors are connected in parallel. Each has plate area A = 5 . 0 0 1 0 - 2 m 2 and plate spacing d = 1 . 2 0 1 0 - 3 m . What must be the spacing of a single capacitor of plate area A if its capacitance equals that of the parallel combination? Tries 0 / 1 0 What must be the spacing if the three capacitors are connected in series? Tries 0

A small object is placed to the left of a convex lens and on its optical axis. The object is 1 5 cm from the lens, which has a focal length of 1 0 cm . Answer problems 2 6 ) and 2 7 ) . Where will the image be located ( how far from lens and which side ) ? What is the magnification, and is it upright or inverted?
A small object is placed to the left of a convex

A 1 m long charged rod lies along the x axis. The rod has a linear charge density of 1 n C m . A proton is placed 0 . 1 m from the right end of the charged rod. ( a ) ( 1 point ) What is the force on the proton? ( b ) ( 1 point ) What is the acceleration of the proton?
A 1 m long charged rod lies along the x axis. The

the magnitude of the pointing vector of a planar electromagnetic wave has an average value of . 7 2 4 . whats the max value of magnetic field in the wave

A rogue band of colonists on the moon declares war and prepares to use a catapult to launch large boulders at the earth. Assume that the boulders are launched from the point on the moon nearest the earth. For this problem you can ignore the rotation of the two bodies and the orbiting of the moon. Part A What is the minimum speed with which a

Two objects, m 1 and m 2 are placed a beginning distance d from each other and have a force of 1 0 N between them. What will be the new force between them based on the following changes: a . The distance is cut in half. F g = 2 1 ( 1 2 ) 2 = 4 * F y = 4 0 N b . The distance is doubled. 1 0 0 N c . the mass of m 1 is doubled. d . The mass of m 1 is
Two objects, m 1 and m 2 are placed a beginning

A spaceship traveling in the positive x - direction at 0 . 5 7 0 c relative a space station shoots a projectile out in front of it at a speed of 0 . 2 1 0 c relative the spaceship. Find the speed of the projectile according to an observer in the space station, using Galilean relativity, and special relativity. ( a ) Galilean relativity c ( b )

A capacitor is connected to an AC source. If the maximum current in the circuit is 0 . 4 6 0 A and the voltage from the AC source is given by v = ( 8 0 . 6 V ) sin [ ( 9 6 ) s 1 t ] , determine the following. ( a ) the rms voltage ( in V ) of the source V ( b ) the frequency ( in Hz ) of the source Hz ( c ) the capacitance ( in F ) of the

What is the ratio of the photon rate, r 1 , coming out of a 1 m W , 4 4 5 n m source to the photon rate, r 2 coming out of a 2 m W , 8 9 0 n m source? r 1 r 2 = ( to two significant digits ) Notes: If needed: 1 e V = 1 . 6 e - 1 9 J and E ( e V ) = 1 2 4 0 ( n m )
What is the ratio of the photon rate, r 1 ,

2 Laplace - Runge - Lenz vector ( 5 marks ) For motion under a central conservative force, the total energy and the angular momentum L are both conserved. If the force obeys an inverse - square law force with potential energy V ( r ) = - k / r , the Laplace - Runge - Lenz vector, r A = p L mk , is also conserved. Show that A is perpendicular to L

A gas can be identified by means of its spectral lines because each element

A uniformly dense solid disk and a ring are joined by a massless bar. The disk and ring have the same radius and the same mass. The rotational inertia of the combined object is least relative to

A low - pass filter consists of a 1 0 6 F capacitor in series with a 1 6 1 resistor. The circuit is driven by an AC source with a peak voltage of 5 . 0 0 V

What is the speed of a 1 . 9 keVkeV ( kinetic energy ) proton ?

The diagram below shows a wire with its current going into the screen. For the various points around it , choose the direction of the magnetic field created by the current.
The diagram below shows a wire with its current

( c 1 2 p 1 6 ) By what fraction of its initial volume does the volume of a gas decrease at constant pressure if the temperature is lowered from 8 0 oC to 0 oC ?

In just tuning, the ratio for a major third is 5 / 4 . In equally tempered tuning, the ratio is 1 . 2 6 0 . If a scale is started on a frequency of 9 0 0 Hz for do , what is the difference in frequency for mi ( a major third above do ) on an equally tempered piano and a justly tuned piano?

An ideal gas in a cylinder occupies a volume of 0 . 0 6 5 m 3 at room temperature ( T = 2 9 3 K ) . The gas is confined by a piston with a weight of 1 0 0 N and an area of 0 . 6 5 m 2 . The pressure above the piston is equal to one atmosphere ( atm = 1 . 0 1 3 x 1 0 5 Pa ) . The piston is free to move up and down.

A large block of mass M at rest on a frictionless horizontal surface is connected to a relaxed spring of spring constant k , whose other end is fixed. Another smaller block of mass m with initial speed v , collides with the large block and sticks to it . The maximum compression of the spring, at the moment when the blocks are stopped, is x .

A vertical tube with a radius of 4 . 2 cm is holding oil that has a density of 0 . 9 2 g c m 3 . The pressure in the oil at a depth of 6 4 cm from the top of the surface is q , 5 . 8 1 0 3 P a 5 . 8 1 0 2 P a 1 . 0 1 0 2 P a 1 . 7 1 0 3 P a
A vertical tube with a radius of 4 . 2 cm is

A uniformly charged disk with radius R = 2 5 . 0 cm and uniform charge density = 7 . 7 0 1 0 3 C / m 2 lies in the xy - plane, with its center at the origin. What is the electric field ( in MN / C ) due to the charged disk at the following locations? ( a ) z = 5 . 0 0 cm MN / C ( b ) z = 1 0 . 0 cm MN / C ( c ) z = 5 0 . 0 cm MN / C ( d ) z = 2 0

Match the material to its acoustical property. A . Absorbs most of the sound that strikes it B . Reflects most of the sound that strikes it select A B 1 . Smooth, painted gypsum board select A B 2 . Acoustic ceiling tile

What is the speed of the car at t = 6 s ? ( in m / s )

How wide is the slit? Give your answer in millimeters.

The magnitude of the gravitational field on the surface of a particular planet

Question 1 A 1 , 6 3 6 g mass is hung on a "massless" vertical spring with a spring constant of k = 3 3 0 N m . The mass is pulled down and released such that it undergoes simple harmonic motion with an amplitude of 1 0 . 0 cm . a ) What is the spring potential energy of the system in Joules when the mass is located 6 . 5 cm below the equilibrium
Question 1 A 1 , 6 3 6 g mass is hung on a

Find yy - component of v v = ( 6 . 5 m / sm / s , 2 0 clockwise from the positive yy - axis ) . Express your answer with the appropriate units.

Write this argument out by listing its premises and conclusion in order: The acceleration of the object is 2 0 because there s a physics law that says that force = mass x acceleration and the mass of the object is 5 0 and the force is 1 0 0 0 . Is the argument inductive or deductive, and WHY?

The feathers of some birds change color depending on how light hits structures in their feathers. This color change is an example of the q , of light. polarization diffraction
The feathers of some birds change color depending

Which of the following is the correct statement of Newton's first law of motion? The acceleration of an object is directly proportional to the net force applied to it and inversely proportional to it mass. An object at rest tends to stay at rest, and an object in motion tends to stay in motion with the same speed and the same direction unless
Which of the following is the correct statement

You have considerable Blankmomentum when you reach the ground. Some force is required to bring you to rest.target 1 of 4 If your knees bend, your body is stopped over a Blank distance, and over a Blank time than if you land on straight legs.target 2 of 4 target 3 of 4 Therefore, according to Blank, the

What must be true about normal force on the block due to the ramp?

the acceleration of a motorcycle is given by ax ( t ) = At - Bt ^ 2 where....

A toy dart gun has a muzzle velocity of 4 m / s when its spring is compressed by 0 . 0 5 meters. Darts have a mass of 0 . 1 kg

A micrometer is equal to how many meters?a ) . 1 x 1 0 - 9 mb ) 1 x 1 0 0 mc ) . 1 x 1 0 0 md ) . 1 x 1 0 - 3 m

Dance movements blend three basic qualities: I . Space II . Motion III . Time IV . Force

Consider a 1 0 0 N force applied at the end of a 1 m long crowbar. Calculate the magnitude of the torque produced in both parts. a . What orientation of the force and the crowbar produces the torque with the largest magnitude ( list all such configurations ) ? What is the maximum amount of torque produced? b . What configuration produces the

In a certain region the average horizontal component of Earth's magnetic field is 2 3 uT , and the average inclination or "dip" is 7 6 . What is the corresponding

Distinguish between a vector and a scalar. Give three examples of each, with their corresponding units. ( 3 marks ) b ) Distinguish between accuracy and precision. ( 2 marks ) c ) If you are driving at 1 2 0 km / h along a straight road and you look to the side for 1 . 5 s , how far do you travel during this inattentive period? If you are

Current Attempt in Progress An AM radio station broadcasts an electromagnetic wave with a frequency of 8 3 9 kHz , whereas an FM station broadcasts an electromagnetic wave with a frequency of 9 5 . 5 MHz . How many AM photons are needed to have a total energy equal to that of one FM photon? Units
Current Attempt in Progress An AM radio station

A stone is dropped at t - O . A second stone, with 3 times the mass of the first, is dropped from the same point at t = 1 3 0 ms . ( a ) How farbelow the release point is the center of mass of the two stones at t = 3 4 0 ms ? ( Neither stone has yet reached the ground. ) ( b ) How fastis the center of mass of the two - stone system moving at that

Which of the following combinations of variables results in the greatest period for a pendulum? length = L , mass = M , and maximum angular displacement = 3 degrees length = 2 L , mass = M 2 , and maximum angular displacement = 1 degree length = 1 . 5 L , mass = 2 M , and maximum angular displacement = 2 degrees length = 2 2 L , mass = 2 2 M , and
Which of the following combinations of variables

A block of aluminum at a temperature of T 1 = 3 3 \ deg C has a mass of m 1 = 1 5 kg . It is brought into contact with another block of aluminum that has a mass of m 2 = 0 . 5 0 m 1 and temperature of T 2 = 8 C . Heat is transferred such that the blocks come to thermal equilibrium. This aluminum has a heat capacity of c = 8 9 8 J / kg * K Input an

suppose a woman does 2 5 0 J of work and 9 5 5 0 J of heat is transferred from her into the environment in the process ( a ) what is change in her internal energy, in joules assuming she does not consume any food. ( b ) what is the efficiency

Block A with a mass m 1 and block B with a mass m 2 , are hung from the ceiling of an elevator by ropes 1 and 2 . The system is accelerating downward with acceleration of magnitude g / 2 . Determine the tension in rope 1 . A . T 1 = 1 2 m 1 g B . T 1 = ( 1 2 m 1 m 2 ) g C . T 1 = ( 1 2 m 2 m 1 ) g D . T 1 = 3 2 m 1 g E . T 1 = m 1 g 1 0 . Which of

For the following situation there are: Two astronauts with mass ma , 1 and ma , 2 . They are on two planets with mass mp , 1 and mp , 2 . These planets are orbiting stars with mass ms , 1 and ms , 2 . The radius of the planets are Rp , 1 and Rp , 2 . The radius of the orbits of the planets are Ro , 1 and Ro , 2 . Below you are given the

Chapter - 1 5 : A uniform string has a mass of 0 . 2 kg , and total length L = 4 m , and is shown in Figure - 6 . The string passes over a frictionless pulley and supports an object with M = 1 0 k g object. Assume that a pulse is excited on the string. Find the speed, v , of a pulse travelling along this string. Show all work. Figure - 6 : Diagram
Chapter - 1 5 : A uniform string has a mass of 0

The unit of mass in the Imperial system is called the pound - mass ( l b m ) , where 1 l b m = 0 . 4 5 3 9 k g . Part ( a ) V If there is an uncertainty of 0 . 0 0 0 1 5 kg in the pound - mass unit, what is its percent uncertainty? % uncertainty = 0 . 0 3 3 0 5 Correct! Part ( b ) Based on that percent uncertainty, what mass in units of pound -

Two loudspeakers on a concert stage are vibrating in phase. A listener is 4 6 . 6 m from the left speaker and 3 3 . 3 m from the right one. The listener can respond to all frequencies from 2 0 to 2 0 0 0 0 Hz , and the speed of sound is 3 4 3 m s . What is the lowest frequency that can be heard loudly due to constructive interference?
Two loudspeakers on a concert stage are vibrating

What is the magnitude of vec ( A ) vec ( B ) ?
What is the magnitude of vec ( A ) vec ( B ) ?

Which of the following will be the best conductor of electricity? a . Wood b . Rubber c . Air d . Asbestos e . Iron

How much work does an elevator motor do to lift a 1 5 0 0 kg elevator a height of 1 0 0 m ? How much power must the motor supply to do this in 5 5 s at constant speed?

An ice cube of mass M ( at initial temperature 0 C ) is placed into a lightweight beaker filled with very hot water ( 1 0 0 C ) . The mass of the water is also M . You may ignore the mass and specific heat of the beaker itself. Which one of the following statements is true? The ice is able to cool down the water, but it can only freeze some of the
An ice cube of mass M ( at initial temperature 0

Speedo living on Moon says, "I have 1 0 Newton weight gold." Goslo living on Earth says, "I have 1 0 Newton weight gold." Who is rich? Mark only one oval. Speedo Goslo Both the same
Speedo living on Moon says, "I have 1 0 Newton

When two 6 - V batteries are connected in parallel, the voltage across the combination is
When two 6 - V batteries are connected in

Which of the following statements describes what happens to a gas if its temperature decreases. All statements are correct. The gas will remain a gas. The gas will become a liquid. The gas will become a solid.
Which of the following statements describes what

5 . . . Light energy can be bent to propagate around a curve, what is the process that has to be located for this to happen?m ? grietic field
5 . . . Light energy can be bent to propagate

Determine the domain of each function. 1 7 . f ( x ) = x - 4 x - 5
Determine the domain of each function. 1 7 . f (

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