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Two cars collide head-on. At every moment during the collision, the magnitude of the
force the first car exerts on the second is exactly equal to the magnitude of the force the
second car exerts on the first. This is an example of
A) Newton's first law.
B) Newton's second law.
C) Newton's third law.
D) Newton's law of gravitation.
Compared to the electrostatic force, the nuclear force between adjacent protons in a
nucleus is
A) much weaker.
B) only slightly weaker.
C) about the same size.
D) only slightly larger.
E) much stronger.
A metal sphere of radius 2.0 cm carries a charge of 3.0 μC. What is the electric field 6.0
cm from the center of the sphere?
A) 3.4 x 106 N/C
B) 4.2 x 106 N/C
C) 5.7 x 106 N/C
D) 7.5 x 106 N/C
E) 9.3 x 106 N/C
A sailboat of mass m is moving with a momentum p. Which of the following represents
its kinetic energy?
A) p2/2m
B) mp
C) mp/2
D) 1/2 mp2
E) mp/3
Two displacement vectors have magnitudes of 5 m and 7 m, respectively. When these
two vectors are added, the magnitude of the sum
A) is exactly 2 m.
B) could be as small as 2 m, or as large as 12 m.
C) is exactly 12 m.
D) is larger than 12 m.
E) is exactly 6 m.
A block of ice at 0°C is added to a 150. g aluminum calorimeter cup that holds 200. g of
water at 10°C. If all but 2. g of ice melt, what was the original mass of the block of ice?
A) 47.6 g
B) 38.8 g
C) 62.2 g
D) 42.0 g
E) 31.1 g
By what amount does the intensity level decrease when you triple your distance from a
source of sound?
A) 9.5 dB
B) 4.8 dB
C) 6.0 dB
D) 12 dB
E) 3.0 dB
Light traveling at an angle into a denser medium is refracted
A) toward the normal.
B) away from the normal.
C) perpendicular to the normal.
D) parallel to the normal.
E) equally.
FIGURE 8-1
Five forces act on a massless rod free to pivot at point P, as shown in Fig. 8-1. Which
force is producing a counter-clockwise torque about point P?
A) A
B) B
C) C
D) D
E) E
A mass is attached to a spring of spring constant 60 N/m along a horizontal, frictionless
surface. The spring is initially stretched by a force of 5.0 N on the mass and let go. It
takes the mass 0.50 s to go back to its equilibrium position when it is oscillating. What
is the amplitude?
A) 0.030 m
B) 0.083 m
C) 0.30 m
D) 0.83 m
E) 0.50 m
In order to trap the starship Enterprise, the Klingons build a huge solenoid 10. light
years long with a diameter of 2. million kilometers. Every kilometer length of the
solenoid contains 100. turns of wire.
(a) What magnetic field is produced in the center of the solenoid with a current of 2000.
Amperes? (Give your answer in MKS units.)
(b) This is how many Gauss?
When a neutron collides with a uranium-235 nucleus it can induce a variety of fission
reactions. One such reaction is U + n Xe + Sr + 2 n.
Given the following mass values: Xe, 139.921620 u; Sr, 93.915367 u; U,
235.043924 u; n, 1.008665 u, what mass of uranium is needed to produce a
10-kiloton yield? 1 u = 1.660540 x 10-27 kg; 1 kiloton = 5.0 x 1012 J.
A) 0.57 kg
B) 0.66 kg
C) 6.58 kg
D) 3.85 kg
E) 1.10 kg
A string, fixed at both ends, vibrates at a frequency of 12 Hz with a standing transverse
wave pattern containing 3 loops. What frequency is needed if the standing wave pattern
is to contain 4 loops?
A) 48 Hz
B) 36 Hz
C) 16 Hz
D) 12 Hz
E) 18 Hz
How many turns should a 10-cm long solenoid have if it is to generate a 1.5 x 10-3 T
magnetic field on 1.0 A of current?
A) 12
B) 15
C) 119
D) 1194
E) 3183
If I have a circuit which has unwanted current variations (with time) and I want to
"smooth them out" (want a more steady current), which one of these should be added in
series?
A) battery
B) capacitor
C) inductor
D) resistance
You throw a ball straight up. Compare the sign of the work done by gravity while the
ball goes up with the sign of the work done by gravity while it goes down.
A) Work up is -, and the work down is -.
B) Work up is +, and the work down is +.
C) Work up is -, and the work down is +.
D) Work up is +, and the work down is -.
Does the centripetal force acting on an object do work on the object?
A) no, because the object has constant speed
B) yes, since it takes energy to turn an object
C) yes, since a force acts and the object moves, and work is force times distance
D) no, because the force and the displacement of the object are perpendicular
E) yes, because the force and the displacement of the object are perpendicular
As more resistors are added in series to a constant voltage source (zero internal
resistance), the power supplied by the source
A) does not change.
B) decreases.
C) increases.
D) increases for a time and then starts to decrease.
How much compressional stress builds up in a thick aluminum bar held between 2
immovable walls if the temperature increases by 20. °C? (α = 24. x 10-6 C-1, Y = 7 1010
N/m2)
A) 34. x 105 N/m2
B) 34. x 107 N/m2
C) 34. x 106 N/m2
D) 34. x 104 N/m2
E) 34. x 108 N/m2
A wire of diameter 1.0 mm and length 3.5 m stretches 3.5 mm when 8.0 kg is hung
from it.
(a) What is the Young's modulus for the wire?
(b) What is the effective spring constant for the stretching wire?
FIGURE 23-11
A concave meniscus lens with an index of refraction of 1.48 has radii of 6.0 cm and 4.0
cm (see Fig. 23-11). What is the power of the lens in DIOPTERS?
A) -0.040
B) -20.
C) -0.25
D) -0.20
E) -4.0
A string of length 2.5 m is fixed at both ends. When the string vibrates at a frequency of
85 Hz, a standing wave with five loops is formed.
(a) Determine the distance between two adjacent nodes.
(b) Determine the wavelength of the waves that travel on the string.
(c) Determine the velocity of waves.
(d) Determine the fundamental frequency of this string.
What is the voltage across a 5.0-Ω resistor if the current through it is 5.0 A?
A) 100 V
B) 25 V
C) 4.0 V
D) 1.0 V
If a star has a peak intensity at 580 nm, what is its temperature?
A) 2000 K
B) 5000°F
C) 2000°C
D) 5000 K
E) 5000°C
A 24-kW electric furnace is connected to a 240-V line. What is the resistance of the
furnace?
A) 1000 Ω
B) 10 Ω
C) 2.4 Ω
D) 0.42 Ω
E) 100 Ω
When a vapor condenses
A) the temperature of the substance increases.
B) the temperature of the substance decreases.
C) heat energy leaves the substance.
D) heat energy enters the substance.
What is the change of entropy of water (Lf = 0.333 MJ/kg, Lv = 2.26 MJ/kg) when 450.
grams of water:
(a) changes from liquid to steam?
(b) changes from ice to liquid?
Which temperature scale never gives negative temperatures?
A) Kelvin
B) Fahrenheit
C) Celsius
Suppose one observes cosmic rays creating a new particle high in the atmosphere and
the particle moves at 99.7% the speed of light. It is observed to decay in an average
37.0 μs. What is the proper lifetime of the particle?
A) 2.86 μs
B) 4.33 μs
C) 18.1 μs
D) 12.4 μs
E) 5.33 ms
What is the inductive reactance of a 20-mH inductor at a frequency of 60 Hz?
A) 7.5 Ω
B) 0.13 Ω
C) 1.2 Ω
D) 1.2 mΩ
E) 7.5 mΩ
A stone is thrown horizontally from the top of a tower at the same instant that a ball is
dropped vertically. Which object is traveling faster when it hits the level ground below?
A) Neither, since both are traveling at the same speed.
B) It is impossible to tell from the information given.
C) the ball
D) the stone
Consider a plot of the displacement (x) vs. applied force (F) for an ideal elastic spring.
The slope of the curve would be
A) the spring constant.
B) the reciprocal of the spring constant.
C) the acceleration of gravity.
D) the reciprocal of the acceleration of gravity.
E) the reciprocal of the displacement.
You toss a ball to your friend. When the ball reaches its maximum altitude, its velocity
is
A) zero.
B) horizontal.
C) 9.8 m/s2.
D) vertical.
E) 9.8 m/s.
When a small spherical rock of radius r falls through water, it experiences a drag force
(a)(r)(v), where "v" is its velocity and "a" is a constant proportional to the viscosity of
water. From this, one can deduce that if a rock of diameter 2 mm falls with terminal
velocity, "v," then a rock of diameter 4 mm will fall with terminal velocity
A) v / 4.
B) 2 v.
C) v / 2.
D) 4 v.
E) v.
A leaf falls from a tree. Compare its kinetic energy K to its potential energy U.
A) K increases, and U decreases.
B) K decreases, and U increases.
C) K decreases, and U decreases.
D) K increases, and U increases.
E) K and U remain constant.
