Question 1

A sample of an ideal gas is slowly compressed to one-half its original volume with no change in temperature.What happens to the average speed of the molecules in the sample?

Accepted Answer

A)  It does not change. 
B)  It becomes 4 times as great. 
C)  It becomes 2 times as great. 
D)  It becomes 1/2 as great. 
E)  It becomes 1/4 as great.

Question 2

A howler monkey is the loudest land animal and,under some circumstances,can be heard up to a distance of 5.0 km.Assume the acoustic output of a howler to be uniform in all directions and that the threshold of hearing is 1.0 × 10-12 W/m2.The acoustic power emitted by the howler is closest to

Accepted Answer

A)  0.31 mW. 
B)  0.11 mW. 
C)  1.1 mW. 
D)  3.2 mW. 
E)  11 mW.

Question 3

Suppose you have two negative point charges.As you move them farther and farther apart,the potential energy of this system relative to infinity

Accepted Answer

A)  increases. 
B)  decreases. 
C)  stays the same.

Question 4

A 1500-kg car accelerates from 0 to 25 m/s in 7.0 s with negligible friction and air resistance. What is the average power delivered by the engine? (1 hp = 746 W)

Accepted Answer

A)  50 hp 
B)  60 hp 
C)  70 hp 
D)  80 hp 
E)  90 hp

Question 5

Jan and Len throw identical rocks off a tall building at the same time.The ground near the building is flat.Jan throws her rock straight downward.Len throws his rock downward and outward such that the angle between the initial velocity of the rock and the horizon is 30°.Len throws the rock with a speed twice that of Jan's rock.If air resistance is negligible,which rock hits the ground first?

Accepted Answer

A)  They hit at the same time. 
B)  Jan's rock hits first. 
C)  Len's rock hits first. 
D)  It is impossible to know from the information given.

Question 6

A ball is thrown at a 60.0° angle above the horizontal across level ground. It is thrown from a height of 2.00 m above the ground with a speed of 20.0 m/s and experiences no appreciable air resistance.The time the ball remains in the air before striking the ground is closest to

Accepted Answer

A)  16.2 s. 
B)  3.07 s. 
C)  3.32 s. 
D)  3.53 s. 
E)  3.64 s.

Question 7

A child is trying to stack two uniform wooden blocks,12 cm in length,so they will protrude as much as possible over the edge of a table,without tipping over,as shown in the figure.What is the maximum possible overhang distance d?

Accepted Answer

A)  5 cm 
B)  6 cm 
C)  7 cm 
D)  8 cm 
E)  9 cm

Question 8

Two concentric conducting spherical shells produce a radially outward electric field of magnitude 49,000 N/C at a point 4.10 m from the center of the shells.The outer surface of the larger shell has a radius of 3.75 m.If the inner shell contains an excess charge of -5.30 μC,find the amount of charge on the outer surface of the larger shell.(k = 1/4πε₀ = 8.99 × 10⁹ N ∙ m²/C²)

Accepted Answer

The answer of Two concentric conducting spherical shells produce a...

Question 9

The objective lens of a refracting telescope has a focal length of 60 cm and the eyepiece a focal length of 8.0 cm.What is the angular magnification of the telescope?

Accepted Answer

A)  34 x 
B)  480 x 
C)  68 x 
D)  0.13 x 
E)  7.5 x

Question 10

If the intensity of an electromagnetic wave is 80 MW/m2,what is the amplitude of the magnetic field of this wave? (c = 3.0 × 108 m/s,μ0 = 4π × 10-7 T • m/A,ε0 = 8.85 × 10-12 C2/N • m2)

Accepted Answer

A)  0.82 mT 
B)  0.33 µT 
C)  10 T 
D)  14 T 
E)  0.58 mT

Question 11

When can we be certain that the average velocity of an object is always equal to its instantaneous velocity?

Accepted Answer

A)  always 
B)  never 
C)  only when the velocity is constant 
D)  only when the acceleration is constant 
E)  only when the acceleration is changing at a constant rate

Question 12

A metal having a work function of 2.8 eV is illuminated with monochromatic light whose photon energy is 3.9 eV.What is the threshold frequency for photoelectron production? (h = 6.626 × 10-34 J • s,
1 eV = 1.60 × 10-19 J)

Accepted Answer

A)  6.8 × 1014 Hz 
B)  2.7 × 1014 Hz 
C)  7.6 × 1014 Hz 
D)  8.5 × 1014 Hz 
E)  9.4 × 1014 Hz

Question 13

A sinusoidal electromagnetic wave in vacuum delivers energy at an average rate of 5.00 µW/m². What are the amplitudes of the electric and magnetic fields of this wave? (c = 3.0 × 10⁸ m/s, μ₀ = 4π × 10^-7 T • m/A,ε₀ = 8.85 × 10^-12 C²/N • m²)

Accepted Answer

The answer of A sinusoidal electromagnetic wave in vacuum delivers...

Question 14

A very long thin wire produces a magnetic field of 0.0050 × 10-4 T at a distance of 3.0 mm from the central axis of the wire.What is the magnitude of the current in the wire? (μ0 = 4π × 10-7 T • m/A)

Accepted Answer

A)  7.5 mA 
B)  1.7 mA 
C)  3300 mA 
D)  24,000 mA

Question 15

Two blocks are connected by a string that goes over an ideal pulley as shown in the figure and pulls on block A parallel to the surface of the plane.Block A has a mass of 3.00 kg and can slide along a rough plane inclined 30.0° to the horizontal.The coefficient of static friction between block A and the plane is 0.400.What mass should block B have in order to start block A sliding up the plane?

Accepted Answer

The answer of Two blocks are connected by a string...

Question 16

When determining the number of significant figures in a number,zeroes to the left of the decimal point are never counted.

Accepted Answer

A) True 
 B)False

Question 17

Two flat 4.0 cm × 4.0 cm electrodes carrying equal but opposite charges are spaced 2.0 mm apart with their midpoints opposite each other.Between the electrodes but not near their edges,the electric field strength is 2.5 × 106 N/C.What is the magnitude of the charge on each electrode?
(ε0 = 8.85 × 10-12 C2/N • m2)

Accepted Answer

A)  35 nC 
B)  18 nC 
C)  16 nC 
D)  30 nC

Question 18

A container is filled with a mixture of helium (light molecules)and oxygen (heavy molecules)gases.A thermometer in the container reads 22°C.Which gas molecules have the greater average kinetic energy?

Accepted Answer

A)  It is the same for both of the gases because the temperatures are the same. 
B)  The oxygen molecules do because they are diatomic. 
C)  The oxygen molecules do because they are more massive. 
D)  The helium molecules do because they are less massive. 
E)  The helium molecules do because they are monatomic.

Question 19

A 5.0-Ω resistor and a 9.0-Ω resistor are connected in parallel. A 4.0-Ω resistor is then connected in series with this parallel combination.An ideal 6.0-V battery is then connected across the series-parallel combination of the three resistors.What is the current through
(a)the 4.0-Ω resistor?
(b)the 5.0-Ω resistor?
(c)the 9.0-Ω resistor?

Accepted Answer

The answer of A 5.0-Ω resistor and a 9.0-Ω resistor...

Question 20

A system has a heat source supplying heat to an ideal gas at a rate of 187.0 W and the gas is doing work at a rate of 130.9 W.At what rate is the internal (thermal)energy of the gas changing?

Accepted Answer

A)  56.1 W 
B)  318 W 
C)  -56.1 W 
D)  187 W

Exam 1: A: Foundations

A sample of an ideal gas is slowly compressed to one-half its original volume with no change in temperature.What happens to the average speed of the molecules in the sample?

A howler monkey is the loudest land animal and,under some circumstances,can be heard up to a distance of 5.0 km.Assume the acoustic output of a howler to be uniform in all directions and that the threshold of hearing is 1.0 × 10^-12 W/m².The acoustic power emitted by the howler is closest to

Suppose you have two negative point charges.As you move them farther and farther apart,the potential energy of this system relative to infinity

A 1500-kg car accelerates from 0 to 25 m/s in 7.0 s with negligible friction and air resistance. What is the average power delivered by the engine? (1 hp = 746 W)

A ball is thrown at a 60.0° angle above the horizontal across level ground. It is thrown from a height of 2.00 m above the ground with a speed of 20.0 m/s and experiences no appreciable air resistance.The time the ball remains in the air before striking the ground is closest to

A child is trying to stack two uniform wooden blocks,12 cm in length,so they will protrude as much as possible over the edge of a table,without tipping over,as shown in the figure.What is the maximum possible overhang distance d?

The objective lens of a refracting telescope has a focal length of 60 cm and the eyepiece a focal length of 8.0 cm.What is the angular magnification of the telescope?

If the intensity of an electromagnetic wave is 80 MW/m²,what is the amplitude of the magnetic field of this wave? (c = 3.0 × 10⁸ m/s,μ₀ = 4π × 10^-7 T • m/A,ε₀ = 8.85 × 10^-12 C²/N • m²)

When can we be certain that the average velocity of an object is always equal to its instantaneous velocity?

A metal having a work function of 2.8 eV is illuminated with monochromatic light whose photon energy is 3.9 eV.What is the threshold frequency for photoelectron production? (h = 6.626 × 10^-34 J • s, 1 eV = 1.60 × 10^-19 J)

A sinusoidal electromagnetic wave in vacuum delivers energy at an average rate of 5.00 µW/m². What are the amplitudes of the electric and magnetic fields of this wave? (c = 3.0 × 10⁸ m/s, μ₀ = 4π × 10^-7 T • m/A,ε₀ = 8.85 × 10^-12 C²/N • m²)

A very long thin wire produces a magnetic field of 0.0050 × 10^-4 T at a distance of 3.0 mm from the central axis of the wire.What is the magnitude of the current in the wire? (μ₀ = 4π × 10^-7 T • m/A)

When determining the number of significant figures in a number,zeroes to the left of the decimal point are never counted.

A container is filled with a mixture of helium (light molecules) and oxygen (heavy molecules) gases.A thermometer in the container reads 22°C.Which gas molecules have the greater average kinetic energy?

A system has a heat source supplying heat to an ideal gas at a rate of 187.0 W and the gas is doing work at a rate of 130.9 W.At what rate is the internal (thermal) energy of the gas changing?

Exam 1: A: Foundations

A sample of an ideal gas is slowly compressed to one-half its original volume with no change in temperature.What happens to the average speed of the molecules in the sample?

A howler monkey is the loudest land animal and,under some circumstances,can be heard up to a distance of 5.0 km.Assume the acoustic output of a howler to be uniform in all directions and that the threshold of hearing is 1.0 × 10-12 W/m2.The acoustic power emitted by the howler is closest to

Suppose you have two negative point charges.As you move them farther and farther apart,the potential energy of this system relative to infinity

A 1500-kg car accelerates from 0 to 25 m/s in 7.0 s with negligible friction and air resistance. What is the average power delivered by the engine? (1 hp = 746 W)

A ball is thrown at a 60.0° angle above the horizontal across level ground. It is thrown from a height of 2.00 m above the ground with a speed of 20.0 m/s and experiences no appreciable air resistance.The time the ball remains in the air before striking the ground is closest to

A child is trying to stack two uniform wooden blocks,12 cm in length,so they will protrude as much as possible over the edge of a table,without tipping over,as shown in the figure.What is the maximum possible overhang distance d?

The objective lens of a refracting telescope has a focal length of 60 cm and the eyepiece a focal length of 8.0 cm.What is the angular magnification of the telescope?

If the intensity of an electromagnetic wave is 80 MW/m2,what is the amplitude of the magnetic field of this wave? (c = 3.0 × 108 m/s,μ0 = 4π × 10-7 T • m/A,ε0 = 8.85 × 10-12 C2/N • m2)

When can we be certain that the average velocity of an object is always equal to its instantaneous velocity?

A metal having a work function of 2.8 eV is illuminated with monochromatic light whose photon energy is 3.9 eV.What is the threshold frequency for photoelectron production? (h = 6.626 × 10-34 J • s, 1 eV = 1.60 × 10-19 J)

A sinusoidal electromagnetic wave in vacuum delivers energy at an average rate of 5.00 µW/m2. What are the amplitudes of the electric and magnetic fields of this wave? (c = 3.0 × 108 m/s, μ0 = 4π × 10-7 T • m/A,ε0 = 8.85 × 10-12 C2/N • m2)

A very long thin wire produces a magnetic field of 0.0050 × 10-4 T at a distance of 3.0 mm from the central axis of the wire.What is the magnitude of the current in the wire? (μ0 = 4π × 10-7 T • m/A)

When determining the number of significant figures in a number,zeroes to the left of the decimal point are never counted.

A container is filled with a mixture of helium (light molecules) and oxygen (heavy molecules) gases.A thermometer in the container reads 22°C.Which gas molecules have the greater average kinetic energy?

A system has a heat source supplying heat to an ideal gas at a rate of 187.0 W and the gas is doing work at a rate of 130.9 W.At what rate is the internal (thermal) energy of the gas changing?

A howler monkey is the loudest land animal and,under some circumstances,can be heard up to a distance of 5.0 km.Assume the acoustic output of a howler to be uniform in all directions and that the threshold of hearing is 1.0 × 10^-12 W/m².The acoustic power emitted by the howler is closest to

If the intensity of an electromagnetic wave is 80 MW/m²,what is the amplitude of the magnetic field of this wave? (c = 3.0 × 10⁸ m/s,μ₀ = 4π × 10^-7 T • m/A,ε₀ = 8.85 × 10^-12 C²/N • m²)

A metal having a work function of 2.8 eV is illuminated with monochromatic light whose photon energy is 3.9 eV.What is the threshold frequency for photoelectron production? (h = 6.626 × 10^-34 J • s, 1 eV = 1.60 × 10^-19 J)

A sinusoidal electromagnetic wave in vacuum delivers energy at an average rate of 5.00 µW/m². What are the amplitudes of the electric and magnetic fields of this wave? (c = 3.0 × 10⁸ m/s, μ₀ = 4π × 10^-7 T • m/A,ε₀ = 8.85 × 10^-12 C²/N • m²)

A very long thin wire produces a magnetic field of 0.0050 × 10^-4 T at a distance of 3.0 mm from the central axis of the wire.What is the magnitude of the current in the wire? (μ₀ = 4π × 10^-7 T • m/A)