Chapter 8 Rotational Motion
1) An upright broom is easier to balance when the heavier
end is
A) nearest your hand.
B) highest, farthest from your hand.
C) same either way.
2) Centrifugal forces are an apparent reality to observers
in a reference frame that is
A) at rest.
B) rotating.
C) moving at constant velocity.
D) an inertial reference frame.
E) none of these.
3) Consider a rotating donut-shaped space habitat where
living quarters are on the inside surface farthest from the axis. If
the rotational speed of the habitat increases, the apparent weight of people
inside
A) stays the same.
B) decreases.
C) increases.
4) To turn a stubborn screw, it is best to use a screwdriver
that has a
A) long handle.
B) yellow color.
C) wide handle.
D) none of these.
5) If the planet Jupiter underwent gravitational collapse,
its rate of rotation about its axis would
A) increase.
B) stay the same.
C) decrease.
D) more information needed.
6) A ring, a disk, and a solid sphere begin rolling down
a hill together. The one to reach the bottom first is the
A) ring.
B) sphere.
C) disk.
D) they all reach the bottom at the same time.
E) not enough information is given.
7) If you balance a broom horizontally on one finger,
the center of gravity of the broom will be above your finger - closer to the
bristles end than the handle end. If you saw the broom in two pieces
at that point and weigh the two parts on a scale, you'll find that the heavier
part is the
A) bristles part.
B) handle part.
C) both the same weight.
Chapter 9 Gravity
8) The amount of gravitational force that acts on the space
shuttle while in orbit is
A) the same as the shuttle's weight on the earth's surface.
B) nearly zero.
C) almost as much as the shuttle's weight on the earth's surface.
9) Two objects move toward each other because of gravity.
As the objects get closer and closer, the acceleration of each
A) increases.
B) remains constant.
C) decreases.
10) When the distance between two stars decreases by
half, the force between them
A) ncreases to twice as much.
B) stays the same.
C) increases to four times as much.
D) decreases by one-quarter.
E) decreases by one-half.
11) Half way to the center of a planet of uniform density,
your weight compared to at the surface would be
A) one-quarter.
B) one-half.
C) three-quarters.
D) the same as at the surface.
E) zero.
12) Inside a freely-falling runaway elevator, your
A) acceleration is zero.
B) gravitational interaction with the earth is zero.
C) apparent weight is zero.
D) all of these.
E) none of these.
13) If the sun collapsed to a black hole, the earth's
gravitational attraction to it would be
A) the same.
B) more.
C) less.
14) How far must one travel to get away from the earth's
gravitational field?
A) to a region above the earth's atmosphere.
B) to a region beyond the solar system.
C) to a region well beyond the moon.
D) ...forget it; you can't travel far enough.
15) The main reason ocean tides exist is that the pull
of the moon
A) and sun are in conjunction at high tides and in opposition at low
tides.
B) is greater on oceans closer to the moon and less on oceans farther
from the moon.
C) and the sun on the oceans are in opposite directions.
D) is greater on the earth because the moon is closer to earth.
E) none of these.