Question 1

When an ideal gas increases in volume at constant pressure,the average kinetic energy of the gas molecules

Accepted Answer

A)  increases. 
B)  decreases. 
C)  does not change. 
D)  may either increase or decrease, depending on whether or not the process is carried out adiabatically. 
E)  may or may not change, but insufficient information is given to make such a determination. 
A)  increases. 
B)  decreases. 
C)  does not change. 
D)  may either increase or decrease, depending on whether or not the process is carried out adiabatically. 
E)  may or may not change, but insufficient information is given to make such a determination.

Question 2

A very long straight wire carries a 12-A current eastward and a second very long straight wire carries a 14-A current westward.The wires are parallel to each other and are 42 cm apart.Calculate the force on a 6.4 m length of one of the wires.(μ0 = 4π × 10-7 T • m/A)

Accepted Answer

A)  8.0 × 10-7 N 
B)  5.1 × 10-4 N 
C)  8.0 × 10-5 N 
D)  5.1 × 10-6 N 
E)  2.2 × 10-4 N 
A)  8.0 × 10-7 N 
B)  5.1 × 10-4 N 
C)  8.0 × 10-5 N 
D)  5.1 × 10-6 N 
E)  2.2 × 10-4 N

Question 3

Light of wavelength 500 nm illuminates a round 0.50-mm diameter hole.A screen is placed 6.3 m behind the slit.What is the diameter of the central bright area on the screen?

Accepted Answer

A)  15 mm 
B)  270 μm 
C)  7.7 mm 
D)  3800 μm 
A)  15 mm 
B)  270 μm 
C)  7.7 mm 
D)  3800 μm

Question 4

The figure shows two forces acting on an object,with magnitudes F1 = 78 N and F2 = 26 N.What third force will cause the object to be in equilibrium (acceleration equals zero)?

Accepted Answer

A)  52 N pointing down 
B)  52 N pointing up 
C)  82 N pointing down 
D)  82 N pointing up 
A)  52 N pointing down 
B)  52 N pointing up 
C)  82 N pointing down 
D)  82 N pointing up

Question 5

The gas in a perfectly insulated system does work at a rate of 13 W.At what rate is the internal (thermal)energy of the gas changing?

Accepted Answer

A)  -13 W 
B)  13 W 
C)  0.00 W 
D)  6.5 W 
A)  -13 W 
B)  13 W 
C)  0.00 W 
D)  6.5 W

Question 6

Two extremely large nonconducting horizontal sheets each carry uniform charge density on the surfaces facing each other.The upper sheet carries +5.00 µC/m2.The electric field midway between the sheets is 4.25 × 105 N/C pointing downward.What is the surface charge density on the lower sheet?
(ε0 = 8.85 × 10-12 C2/N • m2)

Accepted Answer

Question 7

If the electric flux through a closed surface is zero,the electric field at points on that surface must be zero.

Accepted Answer

A) True 
 B)False

Question 8

A barge is 15.0 m wide and 75.0 m long and has vertical sides.The bottom of the hull is 1.20 m below the water surface.What is the weight of the barge and its cargo,if it is floating in fresh water of density 1000 kg/m3?

Accepted Answer

A)  22.6 MN 
B)  13.2 MN 
C)  1.35 MN 
D)  1.13 MN 
E)  11.3 MN 
A)  22.6 MN 
B)  13.2 MN 
C)  1.35 MN 
D)  1.13 MN 
E)  11.3 MN

Question 9

Light strikes a 5.0-cm thick sheet of glass at an angle of incidence in air of 50°.The sheet has parallel faces and the glass has an index of refraction 1.50.
(a)What is the angle of refraction in the glass?
(b)After traveling through the glass the light re-emerges into the air.What is the final angle of refraction in air?
(c)As it leaves the glass,by what distance is the path of the ray is displaced from what it was before entering the glass?

Accepted Answer

(a)31° 
(b

Question 10

A 4.00-kg box sits atop a 10.0-kg box on a horizontal table.The coefficient of kinetic friction between the two boxes and between the lower box and the table is 0.600,while the coefficient of static friction between these same surfaces is 0.800.A horizontal pull to the right is exerted on the lower box,as shown in the figure,and the boxes move together.What is the friction force on the UPPER box?

Accepted Answer

A)  19.3 N to the right 
B)  19.3 N to the left 
C)  23.5 N to the right 
D)  31.4 N to the right 
E)  31.4 N to the left 
A)  19.3 N to the right 
B)  19.3 N to the left 
C)  23.5 N to the right 
D)  31.4 N to the right 
E)  31.4 N to the left

Question 11

A worker lifts a 20.0-kg bucket of concrete from the ground up to the top of a 20.0-m tall building.The bucket is initially at rest,but is traveling at 4.0 m/s when it reaches the top of the building. What is the minimum amount of work that the worker did in lifting the bucket?

Accepted Answer

A)  3.92 kJ 
B)  400 J 
C)  560 J 
D)  4.08 kJ 
E)  160 J 
A)  3.92 kJ 
B)  400 J 
C)  560 J 
D)  4.08 kJ 
E)  160 J

Question 12

Which,if any,of the following statements concerning the work done by a conservative force is NOT true?

Accepted Answer

A)  It can always be expressed as the difference between the initial and final values of a potential energy function. 
B)  It is independent of the path of the body and depends only on the starting and ending points. 
C)  When the starting and ending points are the same, the total work is zero. 
D)  All of the above statements are true. 
E)  None of the above statements are true. 
A)  It can always be expressed as the difference between the initial and final values of a potential energy function. 
B)  It is independent of the path of the body and depends only on the starting and ending points. 
C)  When the starting and ending points are the same, the total work is zero. 
D)  All of the above statements are true. 
E)  None of the above statements are true.

Question 13

A 1500-W heater is connected to a 120-V line. How much heat energy does it produce in 2.0 hours?

Accepted Answer

A)  1.5 kJ 
B)  3.0 kJ 
C)  0.18 MJ 
D)  11 MJ 
E)  18 MJ 
A)  1.5 kJ 
B)  3.0 kJ 
C)  0.18 MJ 
D)  11 MJ 
E)  18 MJ

Question 14

A particle is moving at 0.75c relative to a lab on Earth.By what percentage is the Newtonian expression for its momentum in error? (The percentage error is the difference between the erroneous and correct values,divided by the correct one).

Accepted Answer

A)  34% 
B)  28% 
C)  38% 
D)  43% 
A)  34% 
B)  28% 
C)  38% 
D)  43%

Question 15

A metallic sphere of radius 5 cm is charged such that the potential of its surface is 100 V (relative to infinity).Which of the following plots correctly shows the potential as a function of distance from the center of the sphere?

Accepted Answer

A)  plot W 
B)  plot X 
C)  plot Y 
D)  plot Z 
A)  plot W 
B)  plot X 
C)  plot Y 
D)  plot Z

Question 16

A nonconducting spherical shell of inner radius R1 and outer radius R2 contains a uniform volume charge density ρ throughout the shell.Use Gauss's law to derive an equation for the magnitude of the electric field at the following radial distances r from the center of the sphere.Your answers should be in terms of ρ,R1,R2,r,ε0 ,and π.
(a)r 1
(b)R1 2
(c)r > R2

Accepted Answer

(a)E = 0

Question 17

If   
-   
= 0,then the vectors   
and   
have equal magnitudes and are directed in the opposite directions from each other.

Accepted Answer

A) True 
 B)False

Question 18

An ideal parallel-plate capacitor consists of a set of two parallel plates of area A separated by a very small distance d.When the capacitor plates carry charges +Q and -Q,the capacitor stores energy U0.If the separation between the plates is doubled,how much electrical energy is stored in the capacitor?

Accepted Answer

A)  4U0 
B)  2U0 
C)  U0 
D)  U0/2 
E)  U0/4 
A)  4U0 
B)  2U0 
C)  U0 
D)  U0/2 
E)  U0/4

Question 19

A machinist turns the power on to a grinding wheel,which is at rest at time t = 0.00 s.The wheel accelerates uniformly for 10 s and reaches the operating angular velocity of 25 rad/s. The wheel is run at that angular velocity for 37 s and then power is shut off.The wheel decelerates uniformly at 1.5 rad/s2 until the wheel stops.In this situation,the time interval of angular deceleration (slowing down)is closest to:

Accepted Answer

A)  17 s 
B)  15 s 
C)  19 s 
D)  21 s 
E)  23 s 
A)  17 s 
B)  15 s 
C)  19 s 
D)  21 s 
E)  23 s

Question 20

The figure shows three long,parallel,current-carrying wires.The current directions are indicated for currents I1 and I3.The arrow labeled F represents the net magnetic force acting on current I3.The three currents have equal magnitudes.What is the direction of the current I2?

Accepted Answer

A)  into the picture (in the direction opposite to that of I1 and I3) 
B)  horizontal to the right 
C)  vertically upward 
D)  vertically downward 
E)  out of the picture (in the same direction as I1 and I3) 
A)  into the picture (in the direction opposite to that of I1 and I3) 
B)  horizontal to the right 
C)  vertically upward 
D)  vertically downward 
E)  out of the picture (in the same direction as I1 and I3)

Exam 1: A: Foundations

When an ideal gas increases in volume at constant pressure,the average kinetic energy of the gas molecules

A very long straight wire carries a 12-A current eastward and a second very long straight wire carries a 14-A current westward.The wires are parallel to each other and are 42 cm apart.Calculate the force on a 6.4 m length of one of the wires.(μ0 = 4π × 10-7 T • m/A)

Light of wavelength 500 nm illuminates a round 0.50-mm diameter hole.A screen is placed 6.3 m behind the slit.What is the diameter of the central bright area on the screen?

The figure shows two forces acting on an object,with magnitudes F1 = 78 N and F2 = 26 N.What third force will cause the object to be in equilibrium (acceleration equals zero)?

The gas in a perfectly insulated system does work at a rate of 13 W.At what rate is the internal (thermal)energy of the gas changing?

If the electric flux through a closed surface is zero,the electric field at points on that surface must be zero.

A barge is 15.0 m wide and 75.0 m long and has vertical sides.The bottom of the hull is 1.20 m below the water surface.What is the weight of the barge and its cargo,if it is floating in fresh water of density 1000 kg/m3?

A worker lifts a 20.0-kg bucket of concrete from the ground up to the top of a 20.0-m tall building.The bucket is initially at rest,but is traveling at 4.0 m/s when it reaches the top of the building. What is the minimum amount of work that the worker did in lifting the bucket?

Which,if any,of the following statements concerning the work done by a conservative force is NOT true?

A 1500-W heater is connected to a 120-V line. How much heat energy does it produce in 2.0 hours?

A particle is moving at 0.75c relative to a lab on Earth.By what percentage is the Newtonian expression for its momentum in error? (The percentage error is the difference between the erroneous and correct values,divided by the correct one).

A metallic sphere of radius 5 cm is charged such that the potential of its surface is 100 V (relative to infinity).Which of the following plots correctly shows the potential as a function of distance from the center of the sphere?

If - = 0,then the vectors and have equal magnitudes and are directed in the opposite directions from each other.

The figure shows three long,parallel,current-carrying wires.The current directions are indicated for currents I1 and I3.The arrow labeled F represents the net magnetic force acting on current I3.The three currents have equal magnitudes.What is the direction of the current I2?

Foundations

Motion in One Dimension

Acceleration

Momentum

Energy

Principle of Relativity

Interactions

Force

Work

Motion in a Plane

Motion in a Circle

Torque

Gravity

Special Relativity

Periodic Motion

Waves in One Dimension

Waves in Two and Three Dimensions

Fluids

Entropy

Energy Transferred Thermally

Degradation of Energy

Electric Interactions

The Electric Field

Gausss Law

Work and Energy in Electrostatics

Charge Separation and Storage

Magnetic Interactions

Magnetic Fields of Charged Particles in Motion

Changing Magnetic Fields

Changing Electric Fields

Electric Circuits

Electronics

Ray Optics

Wave and Particle Optics

Filters

A very long straight wire carries a 12-A current eastward and a second very long straight wire carries a 14-A current westward.The wires are parallel to each other and are 42 cm apart.Calculate the force on a 6.4 m length of one of the wires.(μ₀ = 4π × 10^-7 T • m/A)

The figure shows two forces acting on an object,with magnitudes F₁ = 78 N and F₂ = 26 N.What third force will cause the object to be in equilibrium (acceleration equals zero)?

A barge is 15.0 m wide and 75.0 m long and has vertical sides.The bottom of the hull is 1.20 m below the water surface.What is the weight of the barge and its cargo,if it is floating in fresh water of density 1000 kg/m³?

The figure shows three long,parallel,current-carrying wires.The current directions are indicated for currents I₁ and I₃.The arrow labeled F represents the net magnetic force acting on current I₃.The three currents have equal magnitudes.What is the direction of the current I₂?