Transcript Gravity Review

Gravity Review
A 100-kg satellite is 200,000 meters
above the surface of the Earth. If the
radius of the Earth is 6.4E6 meters and
its mass is 5.97E24 kg, what is the
gravitational force acting on the
satellite? (G is 6.67E-11)
A 100-kg satellite is 200,000 meters
above the surface of the Earth. If the
radius of the Earth is 6.4E6 meters and
its mass is 5.97E24 kg, what is the
centripetal acceleration (m/s2) of the
satellite? (G is 6.67E-11)
A 100-kg satellite is 200,000 meters
above the surface of the Earth. If the
radius of the Earth is 6.4E6 meters and
its mass is 5.97E24 kg, what is the
centripetal velocity (m/s) of the
satellite? (G is 6.67E-11)
The centers of two 15.0-kilogram
spheres are separated by 3.00 meters.
The magnitude of the gravitational
force between the two spheres is
approximately
A. 1.11 × 10–10 N
B. 3.34 × 10–10 N
C. 1.67 × 10–9 N
D. 5.00 × 10–9 N
The radius of Mars is approximately onehalf the radius of Earth, and the mass of
Mars is approximately one-tenth the mass
of Earth. Compared to the acceleration due
to gravity on the surface of Earth, the
acceleration due to gravity on the surface of
Mars is
A. smaller
B. larger
C. the same
A planet is orbiting a star that is about
10 times the size of our sun. If the star
were to collapse and become a black
hole, what would happen to the
gravitational attraction between the
star and the planet?
A. smaller
B. larger
C. the same
If the Earth were twice as massive
as it is now, then the gravitational
force between it and the Sun would
be
A. the same
B. twice as great
C. half as great
D. four times as great
Compared to the mass of an object
at the surface of the Earth, the
mass of the object a distance of two
Earth radii from the center of the
Earth is
A. the same
B. twice as great
C. one-half as great
D. one-fourth as great
Two objects of equal mass are a fixed
distance apart. If the mass of each
object could be tripled, the
gravitational force between the objects
would
A. decrease by one-third
B. triple
C. decrease by one-ninth
D. increase 9 times
Which graph represents the relationship between
the magnitude of the gravitational force exerted
by Earth on a spacecraft and the distance
between the center of the spacecraft and center
of Earth?
A.
B.
C.
D.
What is the period of orbit of a
communications satellite in
geosynchronous orbit about Earth?
A. 1 year
B. 24 hours
C. 12 hours
D. 60 minutes
An artificial satellite makes 4 complete
revolutions about the Earth in 8 hours.
The period of revolution of the satellite
is
A. ½ hour
B. 2 hours
C. 8 hours
D. 32 hours
In order to experience
weightlessness in a spaceship, an
astronaut must have an
acceleration that is
A. less than that of the ship
B. more than that of the ship
C. the same as that of the ship
Which diagram best represents the gravitational
forces, Fg, between a satellite, S, and Earth?
A.
B.
C.
D.
The shape of the Earth's orbit is
A. circular
B. elliptical
C. helical
D. spherical
The comet Hyakutake, seen in the
Earth's sky in 1996, will take more
than 10,000 years to complete its orbit.
Which object is at a focus of the
comet's orbit?
A. Earth
B. Sun
C. Moon
D. Jupiter
Compared to the time the planet takes
to move from C to D, the time it takes to
move from A to B is
A. less
B. greater
C. the same
Area 1 equals area 2.
Which satellite has the greatest
tangential velocity (m/s)?
A. A
B. B
C. C
D. D
Which satellite has the longest
period?
A. A
B. B
C. C
D. D
At which position in its orbit is the comet's
potential energy the greatest?
A. A
B. B
C. C
D. D