Question 1

A sound of 40 decibels is

Accepted Answer

A)  twice as intense as a sound of 20 decibels. 
B)  10 times as intense as a sound of 20 decibels. 
C)  1000 times as intense as a sound of 20 decibels. 
D)  four times as intense as a sound of 20 decibels. 
E)  100 times as intense as a sound of 20 decibels. 
A)  twice as intense as a sound of 20 decibels. 
B)  10 times as intense as a sound of 20 decibels. 
C)  1000 times as intense as a sound of 20 decibels. 
D)  four times as intense as a sound of 20 decibels. 
E)  100 times as intense as a sound of 20 decibels.

Question 2

A simple ac circuit consists of an inductor connected across the terminals of an ac power source. If the frequency of the ac source is decreased by a factor of four, what happens to the reactance of the
Inductor?

Accepted Answer

A)  It increases by a factor of eight. 
B)  It decreases by a factor of eight. 
C)  It increases by a factor of four. 
D)  It decreases by a factor of four. 
E)  It increases by a factor of two. 
A)  It increases by a factor of eight. 
B)  It decreases by a factor of eight. 
C)  It increases by a factor of four. 
D)  It decreases by a factor of four. 
E)  It increases by a factor of two.

Question 3

A 10-Ω resistor is connected to a 120-V ac power supply. What is the peak current through the resistor?

Accepted Answer

A)  17 A 
B)  0.083 A 
C)  12 A 
D)  0.12 A 
A)  17 A 
B)  0.083 A 
C)  12 A 
D)  0.12 A

Question 4

A siren emitting sound of frequency 1000 Hz approaches a stationary observer at one-half the speed of sound. The observer hears a frequency of

Accepted Answer

A)  1500 Hz. 
B)  1000 Hz 
C)  2000 Hz. 
D)  500 Hz. 
E)  none of the above. 
A)  1500 Hz. 
B)  1000 Hz 
C)  2000 Hz. 
D)  500 Hz. 
E)  none of the above.

Question 5

The half-angle of the conical shock wave produced by a supersonic aircraft is 60°. What is the ratio of the speed of the aircraft to the speed of sound?

Accepted Answer

A)  1.7 
B)  0.87 
C)  1.2 
D)  2.0 
A)  1.7 
B)  0.87 
C)  1.2 
D)  2.0

Question 6

If the velocity versus time graph of an object is a straight line making an angle of +30° (counter clockwise) with the time axis, the object is

Accepted Answer

A)  moving with constant non-zero speed. 
B)  moving with constant non-zero acceleration. 
C)  at rest. 
D)  moving with increasing acceleration. 
A)  moving with constant non-zero speed. 
B)  moving with constant non-zero acceleration. 
C)  at rest. 
D)  moving with increasing acceleration.

Question 7

A 10-gram wire that is 6.0 m long is under tension. When a transverse wave of frequency 280 Hz travels along the wire, its wavelength is 0.60 m,and its amplitude is 8.4 mm. How much time does
It take for a crest of the transverse wave to travel the length of the wire?

Accepted Answer

A)  49 ms 
B)  36 ms 
C)  40 ms 
D)  44 ms 
E)  31 ms 
A)  49 ms 
B)  36 ms 
C)  40 ms 
D)  44 ms 
E)  31 ms

Question 8

Three identical capacitors are connected in series across a potential source (battery). If a charge of Q flows into this combination of capacitors, how much charge does each capacitor carry?

Accepted Answer

A)  3Q 
B)  Q/3 
C)  Q 
D)  Q/9 
A)  3Q 
B)  Q/3 
C)  Q 
D)  Q/9

Question 9

An auto manufacturer advertises that their car can go "from zero to sixty in eight seconds." This is a description of what characteristic of the car's motion?

Accepted Answer

A)  average acceleration 
B)  instantaneous speed 
C)  instantaneous acceleration 
D)  average speed 
E)  displacement 
A)  average acceleration 
B)  instantaneous speed 
C)  instantaneous acceleration 
D)  average speed 
E)  displacement

Question 10

Decreasing the resistance of an ammeter's shunt resistance

Accepted Answer

A)  enables more current to pass directly through the galvanometer. 
B)  converts it to a voltmeter. 
C)  allows it to measure a larger current at full scale deflection. 
D)  allows it to measure a smaller current at full scale deflection. 
A)  enables more current to pass directly through the galvanometer. 
B)  converts it to a voltmeter. 
C)  allows it to measure a larger current at full scale deflection. 
D)  allows it to measure a smaller current at full scale deflection.

Question 11

Two tuning forks have frequencies of 440 and 522 Hz. What is the beat frequency if both are sounding simultaneously?

Accepted Answer

A)  481 Hz 
B)  82 Hz 
C)  41 Hz 
D)  962 Hz 
E)  55 Hz 
A)  481 Hz 
B)  82 Hz 
C)  41 Hz 
D)  962 Hz 
E)  55 Hz

Question 12

What is 56 + (32.00)/(1.2465 + 3.45) written with the correct number of significant figures?

Accepted Answer

A)  62.81 
B)  62.8123846 
C)  62.812 
D)  62.8 
E)  63 
A)  62.81 
B)  62.8123846 
C)  62.812 
D)  62.8 
E)  63

Question 13

Suppose that a sound source is emitting waves uniformly in all directions. If you move to a point twice as far away from the source, the frequency of the sound will be

Accepted Answer

A)  twice as great. 
B)  one-fourth as great. 
C)  half as great. 
D)  unchanged. 
A)  twice as great. 
B)  one-fourth as great. 
C)  half as great. 
D)  unchanged.

Question 14

A car is traveling with a constant speed when the driver suddenly applies the brakes, causing the car to slow down with a constant acceleration of magnitude 3.   . If the car comes to a stop in
A distance of 30.0 m, what was the car's original speed?

Accepted Answer

A)  10.2 m/s 
B)  14.5 m/s 
C)  315 m/s 
D)  105 m/s 
E)  210 m/s 
A)  10.2 m/s 
B)  14.5 m/s 
C)  315 m/s 
D)  105 m/s 
E)  210 m/s

Question 15

Doubling the potential across a given capacitor causes the energy stored in that capacitor to

Accepted Answer

A)  reduce to one-fourth. 
B)  quadruple. 
C)  reduce to one-half. 
D)  double. 
A)  reduce to one-fourth. 
B)  quadruple. 
C)  reduce to one-half. 
D)  double.

Question 16

An ideal parallel-plate capacitor consists of two parallel plates of area A separated by a distance d. This capacitor is connected across a battery that maintains a constant potential difference between
The plates. If the separation between the plates is now doubled, the magnitude of the charge on the
Plates will

Accepted Answer

A)  be cut in fourth. 
B)  double. 
C)  quadruple. 
D)  not change. 
E)  be cut in half. 
A)  be cut in fourth. 
B)  double. 
C)  quadruple. 
D)  not change. 
E)  be cut in half.

Question 17

A resistor and an inductor are connected in series to an ideal battery of constant terminal voltage. At the moment contact is made with the battery, the voltage across the resistor is

Accepted Answer

A)  greater than the battery's terminal voltage. 
B)  less than the battery's terminal voltage, but not zero. 
C)  equal to the voltage across the inductor. 
D)  equal to the battery's terminal voltage. 
E)  zero. 
A)  greater than the battery's terminal voltage. 
B)  less than the battery's terminal voltage, but not zero. 
C)  equal to the voltage across the inductor. 
D)  equal to the battery's terminal voltage. 
E)  zero.

Question 18

A policeman in a stationary car measures the speed of approaching cars by means of an ultrasonic device that emits a sound with a frequency of 39.6 kHz. A car is approaching him at a speed of 35.0
M/s) The wave is reflected by the car and interferes with the emitted sound producing beats. What
Is the frequency of the beats when the speed of sound in air is 343 m/s?

Accepted Answer

A)  8490 Hz 
B)  5000 Hz 
C)  4250 Hz 
D)  9000 Hz 
E)  4500 Hz 
A)  8490 Hz 
B)  5000 Hz 
C)  4250 Hz 
D)  9000 Hz 
E)  4500 Hz

Question 19

An object moving in the  +x  direction experiences an acceleration of     This means the object

Accepted Answer

A)  is decreasing its velocity by  2.0 m/s every second. 
B)  is traveling at  2.0 m/s. 
C)  is increasing its velocity by  2.0 m/s every second. 
D)  travels  2.0 m in every second. 
A)  is decreasing its velocity by  2.0 m/s every second. 
B)  is traveling at  2.0 m/s. 
C)  is increasing its velocity by  2.0 m/s every second. 
D)  travels  2.0 m in every second.

Question 20

Brick A is dropped from the top of a building. Brick B is thrown straight down from the same building, and neither one experiences appreciable air resistance. Which statement about their
Accelerations is correct?

Accepted Answer

A)  The acceleration of A is greater than the acceleration of B. 
B)  Neither brick has any acceleration once it is released. 
C)  The acceleration of B is greater than the acceleration of A. 
D)  The two bricks have exactly the same acceleration. 
A)  The acceleration of A is greater than the acceleration of B. 
B)  Neither brick has any acceleration once it is released. 
C)  The acceleration of B is greater than the acceleration of A. 
D)  The two bricks have exactly the same acceleration.

Exam 2: Describing Motion: Kinematics in One Dimension

A sound of 40 decibels is

A simple ac circuit consists of an inductor connected across the terminals of an ac power source. If the frequency of the ac source is decreased by a factor of four, what happens to the reactance of the Inductor?

A 10-Ω resistor is connected to a 120-V ac power supply. What is the peak current through the resistor?

A siren emitting sound of frequency 1000 Hz approaches a stationary observer at one-half the speed of sound. The observer hears a frequency of

The half-angle of the conical shock wave produced by a supersonic aircraft is 60°. What is the ratio of the speed of the aircraft to the speed of sound?

If the velocity versus time graph of an object is a straight line making an angle of +30° (counter clockwise) with the time axis, the object is

A 10-gram wire that is 6.0 m long is under tension. When a transverse wave of frequency 280 Hz travels along the wire, its wavelength is 0.60 m,and its amplitude is 8.4 mm. How much time does It take for a crest of the transverse wave to travel the length of the wire?

Three identical capacitors are connected in series across a potential source (battery). If a charge of Q flows into this combination of capacitors, how much charge does each capacitor carry?

An auto manufacturer advertises that their car can go "from zero to sixty in eight seconds." This is a description of what characteristic of the car's motion?

Decreasing the resistance of an ammeter's shunt resistance

Two tuning forks have frequencies of 440 and 522 Hz. What is the beat frequency if both are sounding simultaneously?

What is 56 + (32.00)/(1.2465 + 3.45) written with the correct number of significant figures?

Suppose that a sound source is emitting waves uniformly in all directions. If you move to a point twice as far away from the source, the frequency of the sound will be

A car is traveling with a constant speed when the driver suddenly applies the brakes, causing the car to slow down with a constant acceleration of magnitude 3. . If the car comes to a stop in A distance of 30.0 m, what was the car's original speed?

Doubling the potential across a given capacitor causes the energy stored in that capacitor to

A resistor and an inductor are connected in series to an ideal battery of constant terminal voltage. At the moment contact is made with the battery, the voltage across the resistor is

An object moving in the +x direction experiences an acceleration of This means the object

Brick A is dropped from the top of a building. Brick B is thrown straight down from the same building, and neither one experiences appreciable air resistance. Which statement about their Accelerations is correct?

Introduction, Measurement, Estimating

Kinematics in Two Dimensions; Vectors

Dynamics: Newtons Laws of Motion

Circular Motion; Gravitation

Work and Energy

Linear Momentum

Rotational Motion

Static Equilibrium; Elasticity and Fracture

Fluids

Oscillations and Waves

Sound

Temperature and Kinetic Theory

Heat

The Laws of Thermodynamics

Electric Charge and Electric Field

Electric Potential

Electric Currents

Dc Circuits

Magnetism

Electromagnetic Induction and Faradays Law

Electromagnetic Waves

Light: Geometric Optics

The Wave Nature of Light

Optical Instruments

The Special Theory of Relativity

Early Quantum Theory and Models of the Atom

Quantum Mechanics of Atoms

Molecules and Solids

Nuclear Physics and Radioactivity

Nuclear Energy; Effects and Uses of Radiation

Elementary Particles

Astrophysics and Cosmology

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