Chapter 5: Circular Motion and
Gravity
A ball is whirled in a horizontal circle of radius r
and speed v. The radius is increased to 2r
keeping the speed of the ball constant. The
period of the ball changes by a factor of
A.
B.
C.
D.
E.
one half.
one.
two.
three.
four.
A ball is whirled in a horizontal circle of radius r
and speed v. The radius is increased to 2r
keeping the speed of the ball constant. The
period of the ball changes by a factor of
A.
B.
C.
D.
E.
one half.
one.
two.
three.
four.
The figure shows the position of
a ball as it is being whirled in a
vertical circle. At point (a), the
direction of the centripetal
acceleration is
A)
B)
C)
D)
a
E)
The figure shows the position of
a ball as it is being whirled in a
vertical circle. At point (a), the
direction of the centripetal
acceleration is
A)
B)
C)
D)
a
E)
Suppose a planet exists that has half
the mass of earth and half its radius.
On the surface of that planet, the
acceleration due to gravity is
A.
B.
C.
D.
E.
twice that on Earth.
the same as that on Earth.
half that on Earth.
one-fourth that on Earth.
none of these.
Suppose a planet exists that has half
the mass of earth and half its radius.
On the surface of that planet, the
acceleration due to gravity is
A.
B.
C.
D.
E.
twice that on Earth.
the same as that on Earth.
half that on Earth.
one-fourth that on Earth.
none of these.
The radius R of a stable, circular orbit for a satellite of
mass m and velocity v about a planet of mass M is
given by
A.
B.
C.
D.
E.
R = Gv/M
R = Gv/mM
R = GmM/v
R = GM/mv
R = GM/v2
The radius R of a stable, circular orbit for a satellite of
mass m and velocity v about a planet of mass M is
given by
A.
B.
C.
D.
E.
R = Gv/M
R = Gv/mM
R = GmM/v
R = GM/mv
R = GM/v2
As a satellite falls into a lower orbit, its speed
A.
B.
C.
D.
E.
decreases.
is unchanged.
increases.
depends on the mass of the satellites.
cannot be determined.
As a satellite falls into a lower orbit, its speed
A.
B.
C.
D.
E.
decreases.
is unchanged.
increases.
depends on the mass of the satellites.
cannot be determined.
Which of the following statements is
one of Kepler's three laws of planetary
motion?
A. A line joining any planet to the sun sweeps
out equal areas in equal times.
B. Only an odd number of planets can orbit the
sun.
C. The period of any planet about the sun is
proportional to the planet's distance from
the sun.
D. All planets move in elliptical orbits with the
earth at one focus.
E. F = GMm/R2
Which of the following statements is
one of Kepler's three laws of planetary
motion?
A. A line joining any planet to the sun sweeps
out equal areas in equal times.
B. Only an odd number of planets can orbit the
sun.
C. The period of any planet about the sun is
proportional to the planet's distance from
the sun.
D. All planets move in elliptical orbits with the
earth at one focus.
E. F = GMm/R2
Of the satellites shown revolving
around Earth, the one with the
greatest speed is
A.
B.
C.
D.
E.
1
2
3
4
5
Of the satellites shown revolving
around Earth, the one with the
greatest speed is
A.
B.
C.
D.
E.
1
2
3
4
5
central mass. A is a distance R from
the center, B is at 2R, C is at 3R, D at 4R
and E is at 5R. Which planet has the
longest period of revolution?
central mass. A is a distance R from
the center, B is at 2R, C is at 3R, D at 4R
and E is at 5R. Which planet has the
longest period of revolution?
A planet is orbiting a star in an elliptical orbit as
shown. The speed of the planet when it is at A is
_____ the speed when it is at B.
A.less than
B.equal to
C.greater than
B
rB
rA
A
A planet is orbiting a star in an elliptical orbit as
shown. The speed of the planet when it is at A is
_____ the speed when it is at B.
A.less than
B.equal to
C.greater than
B
rB
rA
A