The rms speed of a certain sample of carbon dioxide molecules, with a molecular
weight of 44g/mole, is 396 m/s. What is the rms speed of water molecules, with a
molecular weight of 18 g/mol, at the same temperature?
A) 253 m/s
B) 387 m/s
C) 421 m/s
D) 506 m/s
E) 619 m/s
Kelli examines her new ruby ring with the jeweler’s “loop”. The ruby appears 7.0 times
larger. If her near point is 35. cm, what is the focal length of the lens?
A) 36. mm
B) 70. mm
C) 67. mm
D) 42. mm
E) 58 mm
The frequency of a microwave signal is 9.76 GHz. What is its wavelength in meters?
A) 3.07 x 10-2 m
B) 2.07 x 10-2 m
C) 1.07 x 10-2 m
D) 5.07 x 10-2 m
E) 4.07 x 10-2 m
On a winter -3.°C morning, the pressure in a car tire reads 28. psi on a pressure gauge.
After several hours of highway traveling, the pressure reads 35. psi. Assuming the
volume remains constant and normal atmospheric pressure of 15. psi, what is the tire
temperature?
A) 45°C
B) 25°C
C) 41°C
D) 55°F
E) 55°C
When is the average velocity of an object equal to the instantaneous velocity?
A) always
B) never
C) only when the velocity is constant
D) only when the velocity is increasing at a constant rate
E) only when the velocity is decreasing at a constant rate
A ball with diameter 10. cm rolls without slipping on a horizontal table top. The
moment of inertia of the ball is 2.2 10-3 kg-m2 and its translational speed is 0.45 m/s.
(a) What is its angular speed about its center of mass?
(b) What is its rotational kinetic energy?
(c) What is its angular momentum?
The condition for rolling without slipping is that the center of mass speed is
A) Vcm= r ω2
B) Vcm = 2 r ω
C) Vcm = r ω / 2
D) Vcm = r ω
E) Vcm = r2 ω
A typical battery (e.g., D-cell or AA-cell) supplies electricity at an approximate cost of
A) $1./kW ∙ h.
B) 10./kW ∙ h.
C) $10./kW ∙ h.
D) 1./kW ∙ h.
E) $100./kW ∙ h.
A jet flies at a speed of Mach 1.3. What is the half-angle of the conical shock wave
formed?
A) 36
B) 100
C) 30
D) 50
E) 44
The length of a telescope is 2.20 m and the focal length of the eyepiece is 1.9 cm. What
is the focal length of the objective?
A) 41 cm
B) 45 cm
C) 111 cm
D) 218 cm
E) 16 cm
Florence, who weighs 120. lbs, stands on a bathroom scale in an elevator. What will the
scale read when the elevator is accelerating downward at 2.0 m/s2?
A) 86. lb
B) 1.4 102 lb
C) 1.2 102 lb
D) 96. lb
E) 1.56 102 lb
The 4d subshell field can contain how many electrons?
A) 7
B) 14
C) 4
D) 10
E) 2
A plane, flying horizontally, releases a bomb, which explodes before hitting the ground.
Neglecting air resistance, the center of mass of the bomb fragments, just after the
explosion
A) moves vertically.
B) moves horizontally.
C) is zero.
D) moves along a parabolic path.
E) remains in the plane.
An electron moves with a speed of 8.0 x 106 m/s along the +x axis. It enters a region
where there is a magnetic field of 2.5 T, directed at an angle of 60 to the +x axis and
lying in the xy plane. Calculate the magnitude of the magnetic force on the electron.
A) 2.8 x 10-10 N
B) 3.2 x 10-10 N
C) 2.8 x 10-12 N
D) 3.2 x 10-12 N
E) 0 N
If you exert a force F on an object, the force which the object exerts on you will
A) depend on whether or not the object is moving.
B) depend on whether or not you are moving.
C) depend on your mass.
D) depend on the object’s mass.
E) always be -F.
FIGURE 13-7
A spring, fixed at both ends, vibrates at a frequency of 12. Hz with a standing transverse
wave pattern as shown in Fig. 13-7. What is this spring’s fundamental frequency?
A) 24. Hz
B) 8.0 Hz
C) 36 Hz
D) 4.0 Hz
E) 16 Hz
A 100-W driveway light bulb is on 10 hours per day. Assuming the power company
charges 10 cents for each kilowatt-hour of electricity used, estimate the annual cost to
operate the bulb.
A) $3.65
B) $7.30
C) $21.40
D) $36.50
E) $73.00
A block of mass M slides down a frictionless plane inclined at an angle θ with the
horizontal. The normal reaction force exerted by the plane on the block is
A) Mg sin θ.
B) zero, since the plane is frictionless.
C) Mg cos θ.
D) Mg.
E) Mg tan θ.
American power plants usually supply 120. volts AC:
(a) at what frequency?
(b) at what maximum voltage?
A loop of wire is rotated about a diameter (which is perpendicular to a given magnetic
field.) In one revolution the induced current in the loop reverses direction how many
times?
A) 0
B) 4
C) 2
D) 1
E) 3
The coefficient of linear expansion for brass is 19. x 10-6 K-1. What is its coefficient of
volume expansion?
A) 5.7 x 10-5 K-1
B) 8 x 10-18 K-1
C) 57. x 10-5 K-1
D) 3.8 x 10-6 K-1
E) 38. x 10-6 K-1
At a depth of about 1030 m in the sea the pressure has increased by 100 atmospheres (to
about 107 N/m2). By how much has 1.0 m3 of water been compressed by this pressure?
The bulk modulus of water is 2.3 x 109 N/m2.
A) 2.3 x 10-3 m3
B) 3.3 x 10-3 m3
C) 4.3 x 10-3 m3
D) 5.3 x 10-3 m3
E) 6.3 x 10-3 m3
A ray of light, which is traveling in a vacuum, is incident on a glass plate (n = ng). For
increasing angles of incidence, the angle of refraction
A) increases, approaching the limiting value of 90.
B) decreases, approaching the limiting value of zero degrees.
C) increases, approaching the limiting value of sin-1 (1/ng) degrees.
D) increases, approaching the limiting value of sin-1 (ng) degrees.
C. D. Anderson
A) discovered the positron using a cloud chamber (1932).
B) was the first to produce diffraction patterns of electrons in crystals (1927).
C) was the first to produce X-ray-like diffraction patterns of electrons passing through
thin metal foil (1927).
D) predicted the positron from relativistic quantum mechanics (1928).
E) set the limits on the probability of measurement accuracy (1927).
A gas is quickly compressed in an isolated environment. During the event, the gas
exchanged no heat with its surroundings. This process is
A) isothermal.
B) isometric.
C) isobaric.
D) adiabatic.
Consider a square which is 1.0 m on a side. Charges are placed at the corners of the
square as follows: +4.0 μC at (0, 0); +4.0 μC at (1, 1); +3.0 μC at (1, 0); -3.0 μC at (0,
1). What is the magnitude of the electric field at the square’s center?
A) 1.1 x 105 N/C
B) 1.3 x 105 N/C
C) 1.5 x 105 N/C
D) 1.7 x 105 N/C
E) 1.9 x 105 N/C
An ice skater performs a pirouette (a fast spin) by pulling in his outstretched arms close
to his body. What happens to his moment of inertia about the axis of rotation?
A) It does not change.
B) It decreases.
C) It increases.
D) It changes, but it is impossible to tell which way.
The number of quarks in a deuteron ( H ) is
A) 4.
B) 2.
C) 3.
D) 6.
E) 5.
Two parallel rays (also parallel to the optic axis) reflect from a concave mirror. They
intersect at
A) the center of curvature.
B) the focal point.
C) a point behind the mirror.
D) infinity.
Nucleons are
A) hadrons.
B) baryons.
C) leptons.
An RC circuit with 2.50 μF and 7.60 MΩ includes a 6.00 volt source.
(a) What is the time constant for charging the capacitor?
(b) What voltage is across the capacitor 25. s after charging begins?
As a system loses its ability to do useful work
A) energy increases.
B) entropy decreases.
C) energy decreases.
D) entropy increases.
E) entropy remains constant.