Universal Gravitation
Answer the following questions. Mark on the screen. You may change
your mind and re-mark before you hit the "grade test" button.
#1
What is the magnitude of the gravitational force between the moon (m
moon
= 7.36 x 10
22
kg) and the Earth (m
Earth
= 5.98 x 10
24
kg)? The average Earth-moon distance is 3.84 x 10
8
m.
a.
1.99 x 10
20
N
b.
7.96 x 10
20
N
c.
7.64 x 10
28
N
d.
2.93 x 10
31
N
#2
Suppose you are an astronaut exploring one of Saturnās moons. The radius of the moon has been determined to be about 3.0 x 10
6
m. While on the planet, you notice that things take about twice as long to fall a given distance as they take to fall the same distance on Earth. What is the best estimate of the moonās mass?
a.
1.1 x 10
17
kg
b.
2.2 x 10
17
kg
c.
3.3 x 10
23
kg
d.
6.6 x 10
23
kg
e.
More information is needed to estimate the moonās mass.
#3
A satellite of mass 1500 kg orbits around the Earth (m
Earth
= 5.98 x 10
24
kg) in a circular orbit at an
altitude
of 6.0 x 10
5
m. What is the orbital speed of the satellite?
a.
6.7 km/s
b.
7.6 km/s
c.
25.8 km/s
d.
57.3 km/s
