PHYSICS 66176

subject Type Homework Help
subject Pages 9
subject Words 1354
subject Authors Paul G. Hewitt

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page-pf1
When bullets are fired from an airplane in the forward direction, the momentum of the
airplane is
A) decreased.
B) unchanged.
C) increased.
When an elevator is accelerating upward, the frequency of a pendulum inside
A) increases.
B) decreases.
C) doesn't change.
When coal dust is spread on snow on a sunny day
A) more melting occurs.
B) less melting occurs.
C) no change in melting rate occurs.
page-pf2
A negatively-charged rod is held near an aluminum can that rests on a dry wood table.
If you momentarily touch the opposite side of the can with your finger, the can becomes
A) positively charged.
B) negatively charged.
C) partially discharged.
D) completely discharged.
E) none of the above
An electron microscope makes use of
A) short wavelengths of light.
B) the wave nature of electrons.
C) electron attraction and repulsion.
D) electron current.
E) the inertia of electrons.
page-pf3
If an apple falls a distance of 2 meters in its first second of fall, then 2 meters in its next
second of fall, and again 2 meters during its third second of fall, the acceleration of the
apple is
1) 0 m/s2.
2) 2 m/s2.
3) 4 m/s2.
4) 10 m/s2.
5) actually, more than 10 m/s2.
This is because
6) no change in velocity occurs during fall.
7) the apple increases in distance by 2 meters for each successive second.
8) the average velocity is 1 m/s for each successive second.
9) its weight is counterbalanced by its inertia.
A 340-hertz sound wave travels at 340 m/s in air with a wavelength of
A) 1 m.
B) 10 m.
C) 100 m.
page-pf4
D) 1000 m.
E) none of the above
Before ice can form on a lake, all the water in the lake must be cooled to
A) zerooC.
B) 4oC.
C) -32o C.
D) none of the above
Some of a wave's energy dissipates as heat. In time, this will reduce the wave's
A) speed.
B) wavelength.
C) amplitude.
D) frequency.
E) period.
page-pf5
A car has a mass of 1000 kg and accelerates at 2 m/s2. What net force is exerted on the
car?
A) 500 N
B) 1000 N
C) 1500 N
D) 2000 N
E) none of these
Galileo dropped two balls of different weights and found they accelerated equally to the
ground below. Einstein imagined the same result for a side-by-side drop
A) without invoking gravity.
B) in an accelerating vehicle.
C) whether they were of the same mass or not.
D) all of the above
E) none of the above
page-pf6
The voltage across a 10-ohm resistor carrying 5 A is
A) 5 V.
B) 10 V.
C) 15 V.
D) 20 V.
E) more than 20 V.
In looking at yourself in a steamy mirror you wipe just enough moisture away to barely
see a full view of your face. If you move back from the mirror you'll see
A) a bit more of your face.
B) a bit less of your face.
C) the same amount of your face.
page-pf7
A blueberry will look black when illuminated with
A) red light.
B) yellow light.
C) magenta light.
D) cyan light.
E) none of the above
A roller skate at rest may have
A) speed.
B) velocity.
C) momentum.
D) energy.
Nellie Newton pulls her sled by a rope that is 45o to the horizontal. The horizontal and
vertical components of force are
A) equal in magnitude.
page-pf8
B) each about 0.7 times the force she exerts on the rope.
C) both of these
D) neither of these
Three resistors take the shape of a triangle, one resistor in each leg. Resistance in one
leg is 4 ohms, 6 ohms in a second leg, and a third leg 10 ohms. Connecting an
ohm-meter across the 10-ohm resistor will show the equivalent resistance to be
A) 1.4 ohms.
B) 5 ohms.
C) 6.7 ohms.
D) greater than 6.7 ohms.
A completely submerged object always displaces its own
A) volume of fluid.
B) weight of fluid.
C) density of fluid.
D) all of the above
page-pf9
E) none of the above
Pioneer 10 was able to escape the solar system by
A) having a sufficient escape velocity at launch.
B) "bouncing off" Jupiter like a tennis ball bouncing off an approaching tennis racket.
C) refueling via solar cells.
D) nuclear-powered sustained thrust.
To the surprise of Michelson and Morley, their interferometer experiment provided
evidence that the speed of light is
A) invariant.
B) the same whether its source approaches or recedes.
C) constant.
D) all of the above
page-pfa
When you are beneath the surface of water and looking upward, light from above is
seen
A) within a cone of 96o.
B) at angles beyond a cone of 96o.
C) at any angle if the surface is smooth.
A river 100 m wide flows due south. A boat that goes 1 m/s relative to the water is
pointed due east as it crosses from the west bank. The boat crosses in
A) 50 s.
B) 100 s.
C) 141 s.
D) 200 s.
page-pfb
Which ball is more elastic?
A) a common rubber ball
B) a steel ball
C) both the same
In air and in water the same sound travels with different
A) frequencies.
B) speeds.
C) both of these
D) neither of these
Which is the greater amount for medication measured by mass?
A) 1 gram
B) 1000 milligrams
C) both the same
page-pfc
While an iron block near the Earth's surface is in free fall, it undergoes an increase in
A) speed.
B) acceleration.
C) both of these
D) neither of these
The Doppler effect due to motion of excited atoms in a glowing gas tends to make the
spectral lines slightly
A) thicker.
B) thinner.
C) more numerous.
D) none of the above
page-pfd
A 101-MHz radio wave has vibrations per second of
A) less than 101,000,000.
B) 101,000,000.
C) more than 101,000,000.
A block of wood and a block of copper will feel neither hot nor cold to the touch when
they each have
A) equal temperatures.
B) your temperature.
C) equal conductivities.
D) none of the above
When properly used, a hydraulic press, like a wheel and axle, is capable of multiplying
force input.
A) A true statement.
B) A false statement.
C) Yes, and in special cases, energy as well.
page-pfe
A block pulled to the left with 15 N and to the right with 5 N at the same time
experiences a net force of
A) 5 N.
B) 10 N.
C) 15 N.
D) 20 N.
Recoil is noticeable if we throw a heavy ball while standing on roller skates. If instead
we go through the motions of throwing the ball but hold onto it, our net recoil will be
A) zero.
B) the same as before.
C) small, but noticeable.
page-pff
Stand a meterstick on its end and let it rotate to the floor. If you attach a heavy glob of
clay to its upper end and repeat, the time to fall will be
A) shorter.
B) longer.
C) the same.

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