Two large parallel metal plates are uniformly and oppositely charged and the electric
field between them is 7.6 x 106 N/C.
(a) What is the charge density on each plate?
(b) If the very large charged plates are moved 2 times farther apart, what is the electric
field between the plates now?
A pendulum makes 12 complete swings in 8.0 s.
(a) What is its frequency?
(b) What is its period?
A simple pendulum, with a 4.4 kg mass and length 75. cm, is released from rest at an
angle of 50.
(a) To what height does the mass swing on the other side?
(b) What is the speed of the mass at the bottom of the swing?
In the fission reaction 235U + 1n 141Ba + 92Kr + neutrons, the number of neutrons
produced is
A) 0.
B) 4.
C) 1.
D) 3.
E) 2.
FIGURE 4-5
A toolbox, of mass M, is resting on a flat board, as shown in Fig. 4-5. One end of the
board is lifted up until the toolbox just starts to slide. The angle θ that the board makes
with the horizontal, for this to occur, depends on the
A) coefficient of kinetic friction, μk.
B) acceleration of gravity, g.
C) mass, M.
D) coefficient of static friction, μs.
E) all of the above quantities.
A rock is suspended from a scale reads 20.0 N. A beaker of water is raised up so the
rock is totally submerged in the water. The scale now reads 12.5 N. What is the density
of the rock?
A) 1.60 x 103 kg/m3
B) 2.50 x 103 kg/m3
C) 2.33 x 103 kg/m3
D) 3.00 x 103 kg/m3
E) 2.67 x 103 kg/m3
The mechanical equivalent of heat was first determined by
A) Lord Kelvin.
B) James Joule.
C) Stefan and Boltzmann.
D) Count Rumford.
E) Con Edison.
What happens to the total relativistic energy of a speedy proton when its relativistic
mass doubles?
A) It doubles.
B) It more than doubles.
C) It less than doubles.
D) It must increase, but it is impossible to say by how much.
Vector = 6.0 m and points 30 north of east. Vector = 4.0 m and points 30 south
of west. The resultant vector + is given by
A) 2.0 m at an angle 30 north of east.
B) 2.0 m at an angle 60 north of east.
C) 10.0 m at an angle 60 east of north.
D) 10.0 m at an angle 30 north of east.
E) 10.0 m at an angle 60 north of east.
As the speed of a particle approaches the speed of light, the momentum of the particle
A) increases.
B) decreases.
C) remains the same.
D) approaches zero.
E) approaches infinity.
A double convex (convex-convex) thin lens has radii of curvature 46. cm, and is made
of glass of index of refraction n = 1.60. What is the focal length?
A) 36. cm
B) infinite
C) 46. cm
D) 18. cm
E) 38 cm
A turntable was revolving at 33 1/3 rpm. It was shut off and uniformly slowed down
and stopped in 5.5 seconds.
(a) What was the angular acceleration?
(b) Through how many revolutions did it turn?
At a particular instant, an electron moves eastward in a uniform magnetic field that is
directed straight downward. The magnetic force that acts on it is
A) Northward.
B) directed upward.
C) Westward.
D) directed to the South.
E) zero.
The plates of a parallel-plate capacitor are maintained with constant voltage by a battery
as they are pulled apart. During this process, the amount of charge on the plates must
A) increase.
B) decrease.
C) remain constant.
D) There is no way to tell from the information given.
The photoelectric effect is explainable assuming
A) that light has a wave nature.
B) that light has a particle nature.
C) that light has a wave nature and a particle nature.
D) that light is an electromagnetic phenomena.
In general, sound is conducted fastest through
A) gases.
B) liquids.
C) solids.
D) a vacuum.
What happens to the velocity of sound in a gas when the absolute temperature of that
gas is doubled?
A) It doubles.
B) It stays the same.
C) It increases to 1.41 times its original value.
D) It quadruples.
You are riding in a spaceship that has no windows or other means for you to observe or
measure what is outside. You wish to determine if the ship is stopped or moving at
constant velocity. What should you do?
A) You can determine if the ship is moving by determining the apparent velocity of
light.
B) You can determine if the ship is moving by checking your precision time piece. If its
running slow, the ship is moving.
C) You can determine if the ship is moving either by determining the apparent velocity
of light or by checking your precision time piece. If its running slow, the ship is
moving.
D) You should give up because you have taken on an impossible task.
A reversible engine takes in 555. Joules per second and exhausts 482. watts.
(a) How much power does it produce?
(b) What is its efficiency?
(c) If operated in reverse as a refrigerator, what would be its COP?
The resistivity of most common metals
A) remains constant over wide temperature ranges.
B) increases as the temperature increases.
C) decreases as the temperature increases.
D) Varies randomly as the temperature increases.
In the Compton effect, as the scattering angle increases, the frequency of the X-rays
scattered at that angle
A) increases.
B) decreases.
C) does not change.
D) varies randomly.
SHM may be written y = A sin( ωt + φ ).
What is the value of φ, the phase constant, when:
(a) the initial displacement is zero?
(b) the initial displacement is A?
(c) the initial velocity is zero?
A voltage has been applied across a capacitor. If the dielectric is replaced with another
dielectric constant eight times as great and the voltage is reduced to half of what it was,
the ENERGY STORED in the capacitor is how many times the original stored energy?
A) 4
B) 1/4
C) 8
D) 1/2
E) 2
What condition or conditions is/are necessary for rotational equilibrium?
A) ΣFy = 0
B) ΣFx = 0, ΣFy = 0
C) Στ = 0
D) ΣFx = 0
E) ΣFx = 0, ΣFy = 0, Στ = 0
What fundamental fact underlies the operation of essentially all electric motors?
A) Iron is the only element that is magnetic.
B) A current-carrying conductor placed perpendicular to a magnetic field will
experience a force.
C) Opposite electric charges attract and like charges repel.
D) A magnetic North pole carries a positive electric charge, and a magnetic South pole
carries a negative electric charge.
E) Alternating current and direct current are both capable of doing work.
A wire of a certain length is carrying a current of 2.0 A. It is placed at an angle of 60
with respect to a magnetic field of strength 0.20 T. If the wire experiences a force of
0.40 N, what is the length of the wire?
A) 1.0 m
B) 1.2 m
C) 1.4 m
D) 1.6 m
E) 1.8 m
C. J. Davisson & L. H. Germer
A) were first to produce X-ray-like diffraction patterns of electrons passing through thin
metal foil (1927).
B) were first to produce diffraction patterns of electrons in crystals (1927).
C) predicted the positron from relativistic quantum mechanics (1928).
D) set the limits on the probability of measurement accuracy (1927).
E) discovered the positron using a cloud chamber (1932).
Jennifer bought a 7 x 25 pair of binoculars for observing baseball. The 25 describes the
A) aperture in cm.
B) aperture in mm.
C) f/number.
D) magnification.
E) .
The resistance of an object is defined as
A) (length)/(resistivity)(cross-sectional area).
B) (current)/(voltage).
C) (voltage)/(current).
D) (length)(resistivity)(cross-sectional area).
E) (voltage)(current).
What power contact lens must be used to correct the vision of a nearsighted person
whose far point is 40 cm?
A) 2.5 diopters
B) -2.5 diopters
C) -3.6 diopters
D) -4.0 diopters
E) 4.0 diopters
See Fig. 18-2. Write the Kirchhoff loop equation for the:
(a) left hand loop in terms of V1, V2, R1, R2, R3, R4, R5, I1, and I2.
(b) right hand loop in terms of V1, V2, R1, R2, R3, R4, R5, I1, and I2.
FIGURE 2-7
to Fig. 2-7. If you start from the Bakery, travel to the Cafe, and then to the Art Gallery,
what is your displacement?
A) 4.0 km South
B) 6.5 km South
C) 2.5 km South
D) 10.5 km North
E) 9.0 km North
How much energy is needed to change the speed of a 1600 kg sport utility vehicle from
15.0 m/s to 40.0 m/s?
A) 1.10 MJ
B) 10.0 kJ
C) 20.0 kJ
D) 40.0 kJ
E) 0.960 MJ
A 55-cm brass rod has a diameter of 30 cm. The compressive strength of steel is 250 x
106 N/m2. What is the compression force that would break the rod?
A) 1.8 x 107 N
B) 2.4 x 107 N
C) 1.4 x 108 N
D) 2.4 x 108 N
E) 4.5 x 108 N
Which is unstable?
A) C
B) Fe
C) Au
D) H
E) He