What is the intensity level of a sound with intensity 10-3 W/m2?
A) 96 dB
B) 30 dB
C) 79 dB
D) 90 dB
E) 60 dB
An object 2.0 cm tall is placed 24. cm in front of a convex mirror whose focal length is
30. cm.
(a) Where is the image formed?
(b) How tall is it?
A 100 kg football linebacker moving at 2 m/s tackles head-on an 80 kg halfback
running 3 m/s. Neglecting the effects due to digging in of cleats
A) this is a simple example of an elastic collision.
B) the linebacker will drive the halfback backward.
C) neither player will drive the other backward.
D) the halfback will drive the linebacker backward.
Lisa Ann is nearsighted with a near point of 75. cm.
(a) What FOCAL LENGTH is this?
(b) What POWER lens is needed to correct her nearsightedness (assuming distance
from lens to eye is negligible)?
A 25. meter long wire, of diameter 0.30 mm, connected to 3.00 volts draws 0.499 A.
(a) What is the resistance of the wire?
(b) What is its resistivity?
(c) What is its conductivity?
When charging a battery, the terminal voltage is ________ the battery emf.
A) less than
B) zero, as is
C) equal to
D) more than
A proton moving eastward with a velocity of 5.0 x 103 m/s enters a magnetic field of
0.20 T pointing northward. What is the magnitude and direction of the force that acts on
the proton?
A) 0 N
B) 1.6 x 10-16 N upwards
C) 1.6 x 10-16 N downwards
D) 1.1 x 10-16 N eastwards
E) 4.4 x 10-16 N westwards
A 25.0-g string is stretched with a tension of 43.0 N between two fixed points 12.0 m
apart. What is the frequency of the second harmonic?
A) 6.00 Hz
B) 12.0 Hz
C) 18.0 Hz
D) 24.0 Hz
E) 36.0 Hz
A circular coil of diameter 20. cm, with 16. turns is in a 0.13 Tesla field.
(a) Find the total flux through the coil when the field is perpendicular to the coil plane.
(b) If the coil is rotated in 10. ms so its plane is parallel to the field, find the average
induced emf.
Kirchhoff’s junction rule is an example of
A) conservation of energy.
B) conservation of charge.
C) conservation of momentum.
D) conservation of energy and momentum.
Two emerging beams of light produced by a birefringent crystal
A) are at different frequencies.
B) will produce an interference pattern when recombined.
C) are polarized in the same direction.
D) are polarized in mutually perpendicular directions.
E) are at 90 with respect to one another.
A blackbody is an ideal system that
A) absorbs 100% of the light incident upon it, but cannot emit light of its own (i.e., a
“black” body).
B) emits 100% of the light it generates, but cannot absorb radiation of its own.
C) either absorbs 100% of the light incident upon it, or emits 100% of the radiation it
generates.
D) absorbs 50% of the light incident upon it, and emits 50% of the radiation it
generates.
How much power does a sphere with a radius of 10 cm radiate if is has an emissivity e
= 1.0 and is kept at a temperature of 400 K? The Stefan-Boltzmann constant is 5.67 x
10-8 W/(m2∙K4).
A) 60 W
B) 70 W
C) 180 W
D) 210 W
E) 360 W
Capacitance of capacitors depends upon
A) the material between the conductors.
B) the geometry of the conductors.
C) the space between the conductors.
D) all of these answers.
E) none of these answers.
FIGURE 24-1
Monochromatic light from a distant source is incident on two parallel narrow slits. After
passing through the slits the light strikes a screen, as shown in Fig. 24-1. What will be
the nature of the pattern of light observed on the screen?
A) The screen will be most brightly illuminated at point O, with the intensity decreasing
slowly and uniformly as you move outward from point O.
B) There will be a series of alternating light and dark bands.
C) A rainbow of colored lines will be seen spreading out on either side of point O.
D) There will be two bright bands of light, one in line with each slit.
E) The screen will be uniformly illuminated except for two dark bands, one in line with
each slit.
A space station of diameter 40. meters is turning about its axis at a constant rate. What
is the period of revolution of the space station if the outer rim experiences an
acceleration of 2.5 m/s2?
A) 10. s
B) 14. s
C) 11. s
D) 13. s
E) 18. s
FIGURE 10-1
A bimetallic strip, consisting of metal G on the top and metal H on the bottom, is rigidly
attached to a wall at the left, as shown in Fig. 10-1. The coefficient of linear thermal
expansion for metal G is greater than that of metal H. If the strip is uniformly heated, it
will
A) curve upward.
B) curve downward.
C) remain horizontal, but get longer.
D) bend in the middle.
An ideal gas is compressed to one-half its original volume during an isothermal
process. The final pressure of the gas
A) increases to twice its original value.
B) increases to less than twice its original value.
C) increases to more than twice its original value.
D) does not change.
To determine the height of a flagpole, Abby throws a ball straight up and times it. She
sees that the ball goes by the top of the pole after 0.5 s and then reaches the top of the
pole again after a total elapsed time of 4.1 s. How high is the pole above the point
where the ball was launched?
A) 10 m
B) 13 m
C) 16 m
D) 18 m
E) 26 m
You hit a handball too hard, and it lands horizontally on top of a roof. If its original
velocity was vo at an angle θ above the horizontal, then it lands on the roof with a
velocity of
A) vo sin θ
B) 2vo
C) vo cos θ
D) zero
E) vo
A person carries a mass of 10 kg and walks along the +x-axis for a distance of 100m
with a constant velocity of 2 m/s. What is the work done by this person?
A) 0 J
B) 20 J
C) 200 J
D) 1000 J
E) None of the other choices is correct.
A beam of unpolarized light in air strikes a flat piece of glass at an angle of 57.3. If the
reflected beam is completely polarized, what is the index of refraction of the glass?
A) 1.50
B) 1.52
C) 1.54
D) 1.56
E) 1.58
To be more effective, how should one shape the tip of a lightning rod?
A) sharpened to a point
B) with a rounded tip (hemispherical)
C) flat (cut off perpendicular to the rod axis)
A 4.0 μF and a 1.0 μF capacitor are connected in parallel and both are charged with a
12. volt battery. They are disconnected from the battery and reconnected positive side
of the 1st to negative side of 2nd, and neg. side of 1st to pos. side of 2nd.
(a) How much was each charged when connected to the battery?
(b) After reconnecting, how much charge is stored?
(c) What potential exists across the final parallel combination?
Oxygen molecules are 16 times more massive than hydrogen molecules. At a given
temperature, the average molecular kinetic energy of oxygen, compared to hydrogen,
A) is greater.
B) is less.
C) is the same.
D) cannot be determined since pressure and volume are not given.
A mercury barometer
A) is an open tube manometer.
B) is a closed tube manometer.
C) measures gauge pressure.
D) is usually 760. cm tall.
E) does not contain mercury.
The magnetic field due to the current in a long, straight wire is 8.0 μT at a distance of
4.0 cm from the center of the wire. What is the current in the wire?
A) 0.20 A
B) 0.40 A
C) 0.80 A
D) 3.2 A
E) 1.6 A
Sound intensity is defined as
A) the loudness of a sound.
B) the sound energy passing through a unit of area.
C) the sound power per unit time.
D) the sound power per unit volume.
E) the sound energy passing through a unit of area per unit time.
A cyclic process is carried out on an ideal gas such that it returns to its initial state at the
end of a cycle.
If the process was carried out on a clockwise sense around the enclosed area, as shown
on the p-V diagram in Fig. 12-2, then that area represents
A) the heat added to the ideal gas.
B) the heat that flows from the ideal gas.
C) the work done by the ideal gas.
D) the work done on the ideal gas.
Mesons consist of
A) quark-antiquark pairs.
B) triple gluons.
C) lepton-antilepton pairs.
D) lepton-quark pairs.
Light enters air from water. The angle of refraction will be
A) greater than the angle of incidence.
B) equal to the angle of incidence.
C) less than the angle of incidence.
D) greater than or equal to the angle of incidence.
E) less than or equal to the angle of incidence.
It is a well-known fact that water has a higher specific heat capacity than iron. Now,
consider equal masses of water and iron that are initially in thermal equilibrium. The
same amount of heat, 30. calories, is added to each. Which statement is true?
A) They remain in thermal equilibrium.
B) They are no longer in thermal equilibrium; the iron is warmer.
C) They are no longer in thermal equilibrium; the water is warmer.
D) It is impossible to say without knowing the exact mass involved and the exact
specific heat capacities.
A spaceship carrying a light clock moves at a speed of 0.96 c relative to an observer on
Earth. Relative to a frame of reference that is fixed with respect to the earth, how long
does it take the clock to advance 1 s?
A) 5.83 s
B) 3.57 s
C) 0.96 s
D) 1.22 s
E) 2.59 s
An object’s angular momentum changes by 10 kg-m2/s in 2.0 s. What magnitude
average torque acted on this object?
A) 2.5 N-m
B) 40 N-m
C) 10 N-m
D) 5 N-m
E) 20 N-m
Define an elastic collision in terms of conservation of momentum and energy.
What does the prefix kilo- stand for?