An object moves in a direction parallel to its length with a velocity that approaches the
velocity of light. The length of this object as measured by a stationary observer
A) approaches infinity.
B) approaches zero.
C) increases slightly.
D) does not change.
What is the result of adding 23.4 to 91.237 and then subtracting 23.4?
A) 91.237
B) 91.2
C) 91.3
D) 91.0
E) 91.
If the phase angle between sound waves from two different point sources is 180, what
kind of interference will occur?
A) destructive
B) constructive
C) either constructive or destructive
A fighter plane moving 200 m/s fires a projectile with speed 50 m/s in a forward
direction. The projectile makes an angle of 30 with the direction of the plane’s motion.
What is the speed of the projectile with respect to a stationary observer on the ground?
A) 293 m/s
B) 243 m/s
C) 268 m/s
D) 250 m/s
E) 281 m/s
A 2000. kg car, traveling to the right at 30. m/s, collides with a brick wall and comes to
rest in 0.20 s. The average force the car exerts on the wall is
A) 60. kN.
B) 300 kN.
C) 600 kN.
D) 12. kN.
E) 30. kN.
If a force accelerates 4.5 kg at 40. m/s2, that same force would accelerate 18. kg by how
much?
A) 0.18 km/s2
B) 40. m/s2
C) 10. m/s2
D) 32. ft/s2
E) 0.16 km/s2
You are standing on a sidewalk. There is a car in the distance. The horn on the car
sounds. You hear it at a pitch that corresponds to a sound frequency lower than the
frequency emitted by the horn. What can you conclude?
A) The wind has a component of its velocity in a direction toward you.
B) The car is moving on a line directly away from your present location.
C) The wind has a component of its velocity in a direction away from you.
D) The car has a component of its velocity in a direction away from you.
E) Either A or C must be true.
The work done by the gas is zero during an
A) isothermal expansion.
B) isobaric expansion.
C) adiabatic expansion.
D) isometric process.
Charge +2q is placed at the origin and charge -q is placed at x = 2a. Where can a third
positive charge +q be placed so that the force on it is zero?
The potential applied to a 20. Ω resistor is 60. cos (33. t) volts. What is the:
(a) instantaneous current?
(b) rms current?
The angle of incidence
A) must equal the angle of reflection.
B) is always less than the angle of reflection.
C) may be greater than, less than, or equal to the angle of reflection.
D) is always greater than the angle of reflection.
A car starting from rest moves with constant acceleration of 2 m/s2 for 10 s, then travels
with constant speed for another 10 s, and then finally slows to a stop with constant
acceleration of -2 m/s2. How far does it travel?
A) 400 m
B) 100 m
C) 500 m
D) 300 m
E) 200 m
FIGURE 4-10
Two boxes are connected by a cord running over a pulley as shown in Fig. 4-10. Box I
of mass 8.0 kg rest on the top of the table; the coefficient of kinetic friction between
box I and the table is 0.10. Box II has a mass of 15.0 kg.
(a) Draw the free-body diagrams for the two boxes, identifying all of the forces acting
on each of the masses.
(b) Calculate the acceleration of the system.
(c) Calculate the tension in the cord.
You toss a ball to a friend. When the ball reaches its maximum altitude, its acceleration
A) changes sign.
B) is zero.
C) is constant.
D) is g/2.
E) is 2*g.
Fig. 18-6 is a symbol for which of the following?
A) galvanometer
B) voltmeter
C) resistor
D) fuse
E) ammeter
A parallel-plate capacitor has plates of area 0.80 m2 separated by a distance of 3.0 mm.
What is this capacitor’s capacitance?
A) 270 F
B) 70 F
C) 2.4 x 10-9 F
D) 4.8 x 10-10 F
E) 3.6 x 10-10 F
A steel sphere with a radius of 2.0 m falls off a ship and sinks to a depth where the
pressure is 15 MN/m2. The bulk modulus for steel is 1.61011 N/m2. What is the change
in the radius of the sphere?
A) 0.021 mm
B) 4.2 mm
C) 0.42 mm
D) 0.19 mm
E) 0.063 mm
How much heat is required to change 456 g of ice at -25.0°C into water at 25.0°C? The
specific heat of ice is 2090 J/(kg K) and the latent heat of fusion of water is 33.5 x 104
J/kg.
A) 224 kJ
B) 153 kJ
C) 112 kJ
D) 71.5 kJ
E) 72.5 kJ
Planck’s constant
A) sets an upper limit to the amount of energy that can be absorbed or emitted.
B) sets a lower limit to the amount of energy that can be absorbed or emitted.
C) relates mass to energy.
D) determines the value of the gravitational constant.
A 10 microcoulomb charge is placed at the origin and a 20 microcoulomb charge is
placed on the x-axis at x = 40 cm. If an electron is placed on the y-axis at y = 30 cm,
what is the magnitude of the force it will experience?
A) 0.615 x 10-13 N
B) 2.46 x 10-13 N
C) 4.92 x 10-13 N
D) 1.23 x 10-13 N
E) 2.46 x 10-14 N
If ℓ = 4, how many possible values can the magnetic quantum number m have?
A) 4
B) 10
C) 5
D) 9
E) 3
F) 8
1.0 kg is at (-2.0, 2.0); 2.0 kg is at (2.0, -4.0); and 3.0 kg is at (2.0, 0.0).
(a) What is the x coordinate of the center of mass?
(b) What is the y coordinate of the center of mass?
50 g of lead (c = 0.11 kcal/kg ∙ C) at 100C is put into 75 g of water at 0°C. What is the
final temperature of the mixture?
A) 2°C
B) 6.8°C
C) 13°C
D) 25°C
E) 50°C
Which of the following is not a dimensionless number?
A) strain
B) specific gravity
C) stress
D) Reynolds number
FIGURE 18-16
Refer to the portion of a circuit given in Fig. 18-16. What is the potential difference VA
– VB if I = 5.0 Amperes?
A) 63. V
B) 35. V
C) 55. V
D) 45. V
E) 71. V
OnlyCarnot efficiency is
A) Qout/Win.
B) 1 – Thot/Tcold.
C) 1 – Qcold/Qhot.
D) 1 – Qhot/Qcold.
E) 1 – Tcold/Thot.
The grand unified theory (GUT) would reduce the fundamental forces to
A) 1.
B) 2.
C) 3.
D) 4.
E) 10.
Donald Glazer
A) invented the particle detector tube.
B) invented the bubble chamber.
C) discovered radium and polonium.
D) discovered radioactivity.
E) observed back-scattering from nuclei.
Vector is 75.0 cm long and points at 30 above the positive x axis. Vector is 25.0
cm long and points along the negative x axis. Vector is 40.0 cm long and points at 45
below the negative x axis.
(a) Determine the x and y components of Vector .
(b) Determine the x and y components of Vector .
(c) Determine the x and y components of Vector .
(d) Determine the sum of these three vectors in terms of components.
(e) Determine the sum of these three vectors in terms of magnitude and direction.
Suppose that the maximum rate of change of current in a “high power” transmission
line is 104 A/s. How large a coil (area) placed 10. meters from the line would have 120.
volts (max) induced in it?
A) 6. x 103 m2
B) 2. x 105 m2
C) 6. x 105 m2
D) 2.x 103 m2
E) 6. x 104 m2
(Refer to Fig. 2-8.) During the first 8 s
A) C and D are both slowing down.
B) C and D have constant velocities.
C) C has the same average velocity as D.
D) C is slowing down, and D is speeding up.
E) the acceleration of D is negative.
A 500-N weight sits on the small piston of a hydraulic machine. The small piston has
area 2.0 cm2. If the large piston has area 40 cm2, how much weight can the large piston
support?
A) 25 N
B) 500 N
C) 1000 N
D) 10000 N
E) 40000 N
An electron moving perpendicular to a magnetic field of 3.2 x 10-2 T moves in a circle
of radius 0.40 cm. How fast is this electron moving?
A) 2.3 x 107 m/s
B) 1.9 x 10-53 m/s
C) 1.9 x 10-30 m/s
D) 3.0 x 109 m/s
E) 0.80 x 107 m/s
A car starts from rest and accelerates uniformly at 3 m/s2. A second car starts from rest
6 s later at the same point and accelerates uniformly at 5 m/s2. How long does it take
the second car to overtake the first car?
A) 24.0 s
B) 12.2 s
C) 35.0 s
D) 18.9 s
E) 22.7 s
A 400-m tall tower casts a 600-m long shadow over level ground. At what angle θ is the
sun elevated above the horizon?
A) 33.7°
B) 41.8°
C) 48.2°
D) 65.1°
E) Can’t be found; not enough information.