A 0.32 kg ball is moving horizontally 30. m/s just before bouncing off a wall, thereafter
moving 25. m/s in the opposite direction.
(a) What is the magnitude of its change in momentum?
(b) What percentage of the kinetic energy was lost in the collision?
A pulsar (a rotating neutron star) emits pulses at a frequency of 0.40 kHz. The period of
its rotation is
A) 2.5 ms.
B) 2.5 s.
C) 0.025 s.
D) 0.25 s.
E) 25 ms.
An analog ammeter able to have a 0.5 A maximum reading is to be built using a small
coil of resistance R = 20 Ω, and full scale deflection at 1 mA. What resistance should be
added to this coil and how should it be connected to the coil?
A) 0.08 Ω in parallel
B) 0.5 Ω in parallel
C) 0.02 Ω in series
D) 20.4 Ω in parallel
E) 0.04 Ω in parallel
FIGURE 18-17
In Fig. 18-17, what is the value of the current I1?
A) 0.32 A
B) 0.11 A
C) 0.29 A
D) 0.61 A
E) 0.89 A
A sievert (Sv) is
A) the SI unit of absorbed dose = 1 J/kg = 100 rad.
B) 10-2 J/kg.
C) 3.70 x 1010 decays/s in radium.
D) a dosage of 2.58 x 10-4 C/kg.
E) the effective dose of 1 Gy.
Fig. 13-5 is a “snapshot” of a wave at a given time. The frequency of the wave is 120
Hz. What is the wavelength?
A) 0.05 m
B) 0.10 m
C) 0.20 m
D) 0.30 m
The SI unit of mass, the kilogram, is currently defined
A) as 10-22 the mass of the Earth’s moon.
B) as 10-24 the mass of the Earth.
C) by the President’s weight.
D) by a prototype platinum-iridium cylinder kept at the International Bureau of Weights
and Measures in Sevres, France.
E) the mass of 5.9786332 1026 protons.
150 kcal of heat raises the temperature of 2.0 kg of material by 400 F. What is the
material’s specific heat capacity?
A) 1.35 kcal/kg∙C
B) 1.31 kcal/kg∙C
C) 0.75 kcal/kg∙C
D) 0.34 kcal/kg∙C
E) 0.19 kcal/kg∙C
A stick is moving along the x-axis at 90%c. A person riding with the stick sees it
inclined at 45. with respect to the x-axis. Observers in the rest frame see the stick
making what angle with respect to the x-axis?
A) 79.
B) 66.
C) 53.
D) 45.
E) 88.
If I walk 8.0 meters in a straight line and then walk 5.0 meters in another straight line,
the total displacement cannot have a magnitude of
A) 8. m.
B) 13. m.
C) 3. m.
D) 5. m.
E) 2. m.
A potter’s wheel decelerates from 50 rev/min to 30 rev/min in 5.0 s, with a constant
deceleration. What is the magnitude of the deceleration?
A) 4.0 rad/s2
B) 0.42 rad/s2
C) 25 rad/s2
D) 38 rad/s2
E) 20 rad/s2
A magnifying glass of focal length 150. mm is used to examine an old manuscript.
(a) What is the maximum magnification given by the lens?
(b) What is the magnification for relaxed eye-viewing (image at infinity)?
A voltage V is applied to the primary coil of a step-up transformer with a 3:1 ratio of
turns between its primary and secondary coils. A resistor R connected to the secondary
dissipates a power P = 100 W. How much power is dissipated by the same resistor when
the ratio of turns in the transformer is changed to 24:1 and the same input voltage is
used?
A) 12,000 W
B) 2400 W
C) 24,000 W
D) 6400 W
E) 100 W
A steel lift column in a service station is 4.0 m long and 0.20 m in diameter. Young’s
modulus for steel is 20 1010 N/m2. By how much does the column shrink when a
5000-kg truck is on it?
A) 4.7 x 10-7 m
B) 8.0 x 10-7 m
C) 3.2 x 10-6 m
D) 7.8 x 10-6 m
E) 3.1 x 10-5 m
If the diameter of a radar dish is doubled, what happens to its resolving power assuming
that all other factors remain unchanged?
A) It quadruples.
B) It doubles.
C) It halves.
D) It is reduced to one-quarter its original value.
E) It is reduced to one-eighth its original value.
If a jet plane were to double its MACH-speed, its half-angle will
A) decrease.
B) increase.
C) stay the same.
A 3. Ω resistor is connected in parallel with a 6. Ω resistor. This pair is then connected
in series with a 4. Ω resistor. These resistors are connected to a battery. What will
happen if the 3. Ω resistor burns out, i.e., becomes an infinite resistance?
A) The current in the 4. Ω resistor will drop to zero.
B) The current in the 6. Ω resistor will increase.
C) The current provided by the battery will not change.
D) The power dissipated in the circuit will increase.
A car is able to stop in a distance d. Assuming the same braking force, what distance
does this car require to stop when it is traveling twice as fast?
A) d
B) 2 d
C) d
D) 4 d
E) 2 d
A thermally isolated system is made up of a hot piece of aluminum and a cold piece of
copper; the aluminum and the copper are in thermal contact. The specific heat capacity
of aluminum is more than double that of copper. Which object experiences the greater
temperature change during the time the system takes to reach thermal equilibrium?
A) the copper
B) Neither; both experience the same size temperature change.
C) It is impossible to tell without knowing the masses.
D) the aluminum
The process whereby heat flows in the absence of any medium is referred to as
A) conduction.
B) convection.
C) radiation.
D) inversion.
E) evaporation.
An astronaut goes out for a “space-walk” at a distance above the Earth equal to the
radius of the Earth. Her acceleration will be
A) g.
B) 1/2 g.
C) zero.
D) 1/4 g.
E) g.
A mass is attached to a spring. It oscillates at a frequency of 4.0 Hz when displaced a
distance of 2.0 cm from equilibrium and released. What is the maximum velocity
attained by the mass?
A) 0.08 m/s
B) 0.32 m/s
C) 0.02 m/s
D) 0.40 m/s
E) 0.50 m/s
Phase changes occur
A) as the temperature decreases.
B) as the temperature increases.
C) as the temperature remains the same.
D) all of the above
The absolute potential at a distance of 2.0 m from a negative point charge is -100. V.
What is the absolute potential 4.0 m away from the same point charge?
A) -0.40 kV
B) -50. V
C) -0.50 kV
D) -25. V
E) -0.20 kV
A flux of 4 x 10-5 Wb is maintained through a coil for 0.5 s. What emf is induced in this
coil by this flux?
A) No emf is induced in this coil.
B) 2 x 10-5 V
C) 8 x 10-5 V
D) 6 x 10-5 V
E) 4 x 10-5 V
If you run a complete loop around an outdoor track (400 m) in 100 s, your average
speed is
A) 40000. m/s.
B) 4.0 m/s.
C) 4.0 km/h.
D) 4.0 mph.
E) 0.40 m/s.
A charge of 12 °C passes through an electroplating apparatus in 2.0 min. What is the
average current?
A) 0.10 A
B) 0.24 A
C) 0.60 A
D) 1.0 A
E) 6.0 A
Single-slit diffraction is characterized by
A) a distance between fringes which is independent of wavelength.
B) decreasing angular separation of fringes as the order (m) increases.
C) narrowing of diffraction pattern as slit width is reduced.
D) rapid decrease in intensity of higher order fringes.
Consider two unequal masses, M and m. Which of the following statements is false?
A) It is possible for the center of mass to lie within one of the objects.
B) The center of mass is closer to the larger mass.
C) The center of mass lies on the line joining the centers of each mass.
D) If a uniform rod of mass m were to join the two masses, this would not alter the
position of the center of mass of the system without the rod present.
Two horizontal curves on a bobsled run are banked at the same angle, but one has twice
the radius of the other. The safe speed (no friction needed to stay on the run) for the
smaller radius curve is V. Therefore, the safe speed on the larger radius curve is
A) 0.71 V.
B) 0.10 V.
C) 1.4 V.
D) 0.5 V.
E) 2. V.
An example of a reversible process is the
A) Swinn cycle.
B) Joule cycle.
C) Otto cycle.
D) Carnot cycle.
E) Wenkle cycle.
A package of supplies is dropped from a plane, and one second later a second package
is dropped. Neglecting air resistance, the distance between the falling packages will
A) depend on their weight.
B) decrease.
C) increase.
D) be constant.
E) be gt2.