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Compared to yesterday, you did 3 times the work in one-third the time. To do so, your
power output must have been
A) the same as yesterday's power output.
B) one-third of yesterday's power output.
C) 3 times yesterday's power output.
D) 9 times yesterday's power output.
E) 34 times yesterday's power output.
Convection can occur
A) only in gases.
B) only in solids.
C) only in liquids.
D) only in liquids and gases.
E) in solids, liquids, and gases.
A proton with velocity 2.0 x 105 m/s enters a region where a uniform magnetic field of
0.30 T is present. The proton's velocity makes an angle of 60 with the magnetic field.
What is the pitch of the helical path followed by the proton? (The "pitch" is the distance
traveled parallel to the magnetic field while making one complete revolution around a
magnetic field line.)
A) 0.022 m
B) 0.140 m
C) 0.077 m
D) 0.250 m
E) 0.055 m
Ice has a latent heat of fusion of 80 kcal/kg. How much heat is required to melt 200 g of
ice?
A) 400 J
B) 160 J
C) 67 kJ
D) 32 kJ
E) 16 kJ
The First Law of Thermodynamics is equivalent to
A) the law of conservation of momentum.
B) Newton's third law of motion.
C) the law of conservation of energy.
D) the first law of motion.
E) the Equipartition Principle.
A girl throws a rock horizontally, with a velocity of 10 m/s, from a bridge. It falls 20 m
to the water below. How far does the rock travel horizontally before striking the water?
(use g = 10 m/s2)
A) 14 m
B) 24 m
C) 20 m
D) 16 m
E) 12 m
In a resonating pipe which is open at both ends, there
A) are displacement nodes at each end.
B) are displacement antinodes at each end.
C) is a displacement node at one end and a displacement antinode at the other end.
D) none of the above
An electron has a kinetic energy of 10 eV. What is the wavelength of this electron?
A) 5.9 x 106 m
B) 1.2 x 10-10 m
C) 1.9 x 106 m
D) 3.9 x 10-10 m
E) 3.8 x 10-6 m
Which hydrogen spectral series falls in the visible region?
A) Brackett
B) Paschen
C) Balmer
D) Lyman
Relative to a stationary observer, a moving object
A) appears shorter than normal.
B) appears longer than normal.
C) keeps its same length.
D) can do any of the above. It depends on the relative velocity between the observer
and the object.
E) can do any of the above. It depends on the relative energy between the observer and
the object.
FIGURE 9-1
The slope of the straight line shown on the graph in Fig. 9-1 is called the
A) pressure.
B) Young's modulus.
C) bulk modulus.
D) compressibility.
Car A (mass = 1000 kg) moves to the right along a level, straight road at a speed of 6.0
m/s. It collides directly with car B (mass = 200 kg) in a completely inelastic collision.
What is the speed of the car immediately after the collision?
A) 4.0 m/s
B) 6.0 m/s
C) zero
D) 5.0 m/s
E) 3.0 m/s
Two uniform solid spheres have the same mass, but one has twice the radius of the
other. The ratio of the larger sphere's moment of inertia to that of the smaller sphere is
A) 9/5.
B) 8/5.
C) 4/5.
D) 4.
E) 2.
In which of the following application of technology in the home is radioactivity
utilized?
A) a door-bell
B) a humidifier
C) a smoke detector
D) a food sterilizer
A set of twins, Andrea and Courtney, are initially 10 years old. While Courtney remains
on Earth, Andrea rides on a space ship which travels away from Earth at a speed of 0.6c
for five years (as measured by Courtney), then turns around and comes back at 0.6c.
When Andrea returns, Courtney is 20 years old. How old is Andrea upon her return?
A) 10 years
B) 12 years
C) 15 years
D) 18 years
E) 20 years
What is the source of the energy the sun radiates to us?
A) chemical reactions
B) nuclear fission reactions
C) nuclear fusion reactions
D) cosmic rays
E) gravitational collapse
A coil lies flat on a table top in a region where the magnetic field vector points straight
up. The magnetic field vanishes suddenly. When viewed from above, what is the sense
of the induced current in this coil as the field fades?
A) The induced current flows counterclockwise.
B) There is no induced current in this coil.
C) The induced current flows clockwise.
D) The current flows clockwise initially, and then it flows counterclockwise before
stopping.
FIGURE 2-2
Which graph in Fig. 2-2 represents a constant non-zero velocity?
A) graph a
B) graph b
C) graph c
D) graph d
E) both graphs c and d
What is the energy of a photon with a frequency of 6.60 x 1015 Hz?
A) 27.3 eV
B) 12.3 eV
C) 18.1 eV
D) 19.6 eV
E) 6.60 eV
What are the magnitude and direction of the electric field at a distance of 1.50 m from a
50.0-nC charge?
A) 20 N/C away from the charge
B) 20 N/C toward the charge
C) 10 N/C away from the charge
D) 200 N/C away from the charge
E) 200 N/C toward the charge
You are moving past the Earth at 0.99c and notice your heart beating 88. times/minute.
(a) Your doctor on Earth observes your heart rate to be what?
(b) If you had been moving 99.99% the speed of light, you would have observed your
heart to be beating how fast?
Sphere A carries a net charge and sphere B is neutral. They are placed near each other
on an insulated table. Which statement best describes the electrostatic force between
them?
A) There is no force between them since one is neutral.
B) There is a force of repulsion between them.
C) There is a force of attraction between them.
D) The force is attractive if A is charged positively and repulsive if A is charged
negatively.
E) The force is repulsive if A is charged positively and attractive if A is charged
negatively.
Rainbows are caused by sunlight being
A) dispersed.
B) dispersed, refracted, & reflected.
C) refracted.
D) reflected.
E) refracted & reflected but not dispersed.
By what amount does the intensity level increase when you triple the intensity of a
source of sound?
A) 9.5 dB
B) 4.8 dB
C) 6.0 dB
D) 3.0 dB
E) 12 dB
The symbol for a certain isotope of polonium is Po. How many neutrons are there
in the nucleus of this isotope?
A) 84
B) 130
C) 214
D) 298
E) 314
Using dimensional analysis, which one of the following equations is dimensionally
correct?
( a m/s2, v m/s, x m , t s)⇒ ⇒ ⇒ ⇒
A) x = v/t
B) v = 2ax
C) t2 = x/a
D) x2 = 2av
E) x = a t
When a β+ particle is emitted from an unstable nucleus, the atomic number of the
nucleus
A) increases by 1.
B) does not change.
C) decreases by 1.
D) increases by 2.
E) decreases by 2.
For a projectile launched horizontally, the vertical component of a projectile's velocity
A) is zero.
B) remains a non-zero constant.
C) continuously increases.
D) continuously decreases.
E) any of the above, depending on position.
An aluminum kettle (mass = 100 g) of pure water (mass = 60 g) is at room temperature
(20°C). The kettle and its contents are placed on a 1000-Watt electric burner and heated
to boiling. Assuming that all the heat from the burner heats the kettle and its contents
and that a negligible amount of water evaporates before boiling begins, calculate the
amount of time required to bring the water to a boil.
A) 3.5 min
B) 8.1 min
C) 4.9 min
D) 7.3 min
E) 4.0 min
A 80. volt DC motor draws 4.0 A at its operating speed of 1500. rpm with an armature
resistance of 4.0 Ω.
(a) What is the starting current?
(b) What is the back emf when running normally?
(c) What series resistance could be added to limit the starting current to 10. A?
Refer to Fig. 5-8. If the roller coaster leaves point Q from rest, how fast is it traveling at
point R?
A) 0.98 km/s
B) 31 m/s
C) 22 m/s
D) 0.49 km/s
E) 51 m/s
What is a photon?
A) an electron in an excited state
B) one form of a nucleon, one of the particles that makes up the nucleus
C) a small packet of electromagnetic energy that has particle-like properties
D) an electron that has been made electrically neutral
A charged particle is observed traveling in a circular path in a uniform magnetic field. If
the particle had been traveling twice as fast, the radius of the circular path would be
A) twice the original radius.
B) four times the original radius.
C) 1/ times the original radius.
D) one-half the original radius.
E) one-fourth the original radius.
FIGURE 12-8
Referring to Fig. 12-8, a substance carried from point A to B absorbs 50. J and finds its
internal energy has increased by 20. J. Going from B to C the internal energy decreases
by 5. Joules.
(a) How much work was done from A to B?
(b) How much heat was absorbed from B to C?
(c) How much work was done going from B to C?
