Michael and Misty are standing motionless together on the ice at the center of a very
slippery frozen pond. Michael (mass 75. kg) pushes Misty (46. kg), giving her an
acceleration of 1.8 m/s2 for 0.17 s while they were in contact.
(a) What is Michael’s acceleration?
(b) Who exerts the greater force on the other?
(c) What is Michael’s speed relative to Misty?
A monatomic ideal gas is cooled to one-half its original temperature during an isometric
process. The final pressure of the gas
A) does not change.
B) decreases to half its original value.
C) increases to more than twice its original value.
D) increases to twice its original value.
A 0.600-mm diameter wire stretches 0.5% of its length when it is stretched with a
tension of 20 N. What is the Young’s modulus of this wire?
A) 5.66 x 1010 N/m2
B) 3.54 x 109 N/m2
C) 1.41 x 1010 N/m2
D) 6.43 x 109 N/m2
E) 2.78 x 109 N/m2
A circular loop of wire of radius 0.50 m is in a uniform magnetic field of 0.30 T. The
current in the loop is 2.0 A. What is the magnetic torque when the plane of the loop is
perpendicular to the magnetic field?
A) zero
B) 0.41 m∙N
C) 0.47 m∙N
D) 0.52 m∙N
E) 0.59 m∙N
The source of the earth’s magnetic field is thought to be due to the motion of charged
particles in the earth’s
A) mantle.
B) crust.
C) inner core.
D) outer core.
E) mantle & crust.
A fully charged capacitor (37. μF) is discharged through a resistor (1000. ohms). If the
voltage reduced to 7.6 volts after just 20. ms, what was the original potential on the
capacitor?
A) 16. volts
B) 9.0 volts
C) 8.0 volts
D) 13. volts
E) 11. volts
A series RLC circuit has R = 20. Ω, L = 200. mH, C = 10. μF. At what frequency should
the circuit be driven in order to have maximum power transferred from the driving
source?
A) 0.45 kHz
B) 0.17 kHz
C) 0.28 kHz
D) 0.96 kHz
E) 0.11 kHz
What would be the resonant frequency of an LRC circuit with R = 15 Ω, L = 25 mH,
and C = 30 μF?
A) 1150 Hz
B) 180 Hz
C) 60 Hz
D) 120 Hz
E) 53 MHz
A 2.0 kg mass is attached to the end of a horizontal spring (k = 50. N/m) and set into
simple harmonic motion with an amplitude of 10. cm. What is the total mechanical
energy of this system?
A) 0.02 J
B) 25 J
C) 0.25 J
D) 1.00 J
E) 2.5 J
Astigmatism is usually due to
A) the cornea or lens being out of round.
B) accommodation.
C) myopia.
D) missing rods.
E) hyperopia.
FIGURE 9-3
Instead of cables, a hydraulic lift raises an elevator weighing 2.5 kiloNewtons. The
input piston has a 2.0 cm diameter and the lift piston has a 28. cm diameter (See Fig.
9-3). What minimum force must be applied to the input piston?
A) 13. N
B) 2.5 kN
C) 0.49 MN
D) 0.18 kN
E) 35. kN
A becquerel (Bq) is
A) a dosage of 2.58 x 10-4 C/kg.
B) 3.70 x 1010 decays/s in radium.
C) the SI unit of radioactivity (= 1 decay/s).
D) the SI unit of absorbed dose = 1 J/kg = 100 rad.
E) 10-2 J/kg.
If you hear thunder 5.0 s after seeing a flash of lightning, the distance to the lightning
strike is about
A) 2.2 km.
B) 0.60 km.
C) 1.7 km.
D) 0.90 km.
E) 1.2 km.
A solid block of metal is placed in a uniform electric field. Which statement is correct
concerning the electric field in the block’s interior?
A) The interior field points in a direction opposite to the exterior field.
B) There is no electric field in the block’s interior.
C) The interior field points in a direction that is parallel to the exterior field.
D) The interior field points in a direction that is at right angles to the exterior field.
When dividing several quantities, the number of significant digits in the result must
always be
A) larger than the number of significant digits in the most accurate of the quantities.
B) equal to the number of significant digits in the most accurate of the quantities.
C) equal to the average number of significant digits in the most and least accurate of the
quantities.
D) equal to the number of significant digits in the least accurate of the quantities.
E) smaller than the number of significant digits in the least accurate of the quantities.
A 150. W lamp is placed into a 120. V AC outlet.
(a) What are the peak and rms currents?
(b) What is the resistance of the lamp?
A battery has an internal resistance of 2 Ω. This battery delivers maximum power to a
load resistor that has a value of
A) zero ohms.
B) 4 Ω.
C) 2 Ω.
D) 8 Ω.
E) 1 Ω.
Two children are riding on a merry-go-round. Child A is at a greater distance from the
axis of rotation than child B. Which child has the larger linear displacement?
A) Child A
B) Child B
C) They have the same zero linear displacement.
D) They have the same non-zero linear displacement.
E) There is not enough information given to answer the question.
Suppose that you wish to construct a simple ac generator with an output of 12 V
maximum when rotated at 60 Hz. A magnetic field of 0.050 T is available. If the area of
the rotating coil is 100 cm2, how many turns are needed?
A) 8
B) 16
C) 32
D) 64
E) 128
A motorist travels for 3.0 h at 80 km/h and 4.0 h at 60 km/h. What is her average speed
for the trip?
A) 74 km/h
B) 140 km/h
C) 70 km/h
D) 73 km/h
E) 69 km/h
A future use of space stations may be to provide hospitals for severely burned persons.
It is very painful for a badly burned person on Earth to lie in bed. In a space station, the
effect of gravity can be reduced or eliminated. With what period of rotation would a
doughnut-shaped hospital of 200. m radius have to rotate, if persons on the outer
perimeter are to experience 1/10 the gravity effect of Earth?
A) 91. min
B) 1.5 min
C) 8.7 min
D) 4.6 min
E) 0.011 min
Grandfather clocks often are built so that each one-way swing of the pendulum is a
second. How long is the length of a simple pendulum for a 2.00 second period?
A) 0.993 m
B) 24.8 cm
C) 101.cm
D) 0.500 m
E) 500. cm
The use of wave fronts and rays to describe optical phenomena is called
A) wave optics.
B) geometrical optics.
C) dispersive optics.
D) quantum optics.
You may have heard it said that all objects, even ones at the temperature of our bodies,
are continually emitting electromagnetic radiation. Is this true?
A) Yes, and the radiation referred to results from the trace amounts of radioactive
material that have accumulated in our bodies from the food we eat.
B) Yes, and the radiation from our bodies is mostly in the infrared region of the
spectrum, and hence not detected by our eyes.
C) Yes, and this radiation is mostly in the form of radio waves, which is a common
source of static often heard on an AM radio.
D) No, this is not true. If a person were emitting electromagnetic radiation, he could be
seen glowing in the dark, and this is obviously not the case for most people.
In a multielectron atom, which of the following levels is just above the 6s level?
A) 6p
B) 7s
C) 5p
D) 4f
E) 4d
Four resistors of 12, 3.0, 5.0, and 4.0 Ω are connected in series. A 12-V battery is
connected to the combination. What is the current through the battery?
A) 0.50 A
B) 1.0 A
C) 1.5 A
D) 2.0 A
E) 2.5 A
Fig. 18-9 is a symbol for which of the following?
A) resistor
B) ammeter
C) voltmeter
D) fuse
E) galvanometer
Consider the image formed by a refracting telescope. Suppose an opaque screen is
placed in front of the lower half of the objective lens. What effect will this have?
A) The top half of the image will be blacked out.
B) The lower half of the image will be blacked out.
C) The entire image will be blacked out, since the entire lens is needed to form an
image.
D) The image will appear as it would if the objective were not blocked, but it will be
dimmer.
E) There will be no noticeable difference in the appearance of the image with the
objective partially blocked or not.
Your motorboat can move at 30 km/h in still water. How much time will it take you to
move 12 km upstream, in a river flowing at 6 km/h?
A) 22 min
B) 26 min
C) 20 min
D) 30 min
E) 24 min
The index of refraction of diamond is 2.42. This means that a given wavelength of light
travels
A) 2.42 times faster in air than it does in diamond.
B) 2.42 times faster in diamond than it does in vacuum.
C) 2.42 times faster in vacuum than it does in diamond.
D) 2.42 times faster in diamond than it does in air.
E) 2.42 times faster in vacuum than it does in air.
Find the first three harmonics of a string of linear mass density 2.00 g/m and length
0.600 m when it is subjected to tension of 50.0 N.
A) 32 Hz, 66 Hz, 132 Hz
B) 66 Hz, 132 Hz, 198 Hz
C) 132 Hz, 264 Hz, 396 Hz
D) 264 Hz, 528 Hz, 792 Hz
E) none of the above
When soup gets cold, it often tastes greasy. This “greasy” taste seems to be associated
with oil spreading out all over the surface of the soup, instead of staying in little
globules. This is readily explained in terms of
A) the Bernoulli effect.
B) the decrease in the surface tension of water with increasing temperature.
C) Archimedes Principle.
D) the increase in the surface tension of water with increasing temperature.
E) Poiseuille’s law.
When an electron jumps from an orbit where n = 4 to one where n = 3
A) a photon is emitted.
B) a photon is absorbed.
C) two photons are emitted.
D) two photons are absorbed.
The electric potential at the origin of an xy-coordinate system is 40 V. A -8.0-μC charge
is brought from x = +∞ to that point. What is the electric potential energy of this charge
at the origin?
A) -3.2 x 10-4 J
B) 3.2 x 10-4 J
C) -40 μJ
D) 40 μJ
E) 8.0 μJ
A refrigerator has a coefficient of performance equal to 4.2. How much work must be
done on the refrigerator in order to remove 250 J of heat from the interior?
A) 60 J
B) 120 J
C) 250 J
D) 480 J
E) 1050 J
At what rate is the human body radiating energy when it is at 33°C? Take the body
surface area to be 1.4 m2, and approximate the body as a black body.
FIGURE 7-1
A planet revolves clockwise around a star, with constant speed, as shown in Fig. 7-1.
Which graph shows the direction of the planet’s acceleration at point P: graph a, graph
b, graph c, or graph d?
A point source of light is positioned 20.0 m below the surface of a lake. What is the
diameter of the largest circle on the surface of the water through which light can
emerge?
A person in a rocket ship traveling past the earth at a speed of 0.500c fires a laser gun in
the forward direction. With what speed does an observer on Earth see the light pulse
travel?
What is the change in entropy of the lead when 2.0 kg of molten lead solidifies?
[Data: Lv = 207. kcal/kg at 1744C; Lf = 5.9 kcal/kg at 328.°C]
Why would it be impossible to obtain interference fringes in a double-slit experiment if
the separation of the slits is less than the wavelength of the light used?
What letters are commonly used to designate the subshells L = 0, 1, 2, 3, and 4?
A wall consists of 2 layers of material: brick in front of an equal thickness of wood. If
the respective thermal conductivities of the brick and wood are 1.3 J/m-s-C and 0.15
J/m-s-C, how does the temperature gradient across the wood compare to the gradient
across the brick?
Define and explain the meaning of DENSITY.
Two long parallel wires carry currents of 10. A in opposite directions. They are
separated by 40. cm. What is the magnetic field in the plane of the wires at a point that
is 20. cm from one wire and 60. cm from the other?
Is more work required to increase a car’s speed from rest to 30 mph, or from 50 mph to
60 mph?
A 63. kg astronaut walks upon the surface of the planet Krypton which has 100. times
the mass of the Earth and 100. times the diameter of the Earth. What does she weigh on
Krypton?
What is the ratio of the speed of sound in air at 0°C to the speed at 100°C?
In the periodic table, the horizontal rows are called ________ and the vertical columns
are called ________.
Where must an object be placed with respect to a converging lens of focal length 30 cm
if the image is to be virtual, and three times as large as the object?
When referring to the “mks” system, what does the “m”, the “k”, and the “s” stand for?
Explain what is meant by a net or unbalanced force.
The peak output of a generator is 20. A and 240. V. What average power is provided by
the generator?