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Homework-18
1.
Fill the table
Fg
.5 N
100 N
m1
5000 kg
3.2 x 1026
5.2 x 1013
106 kg
m2
10,000 kg
1000 kg
5.9 x 1024 kg
r
100 m
100,000 m
5,000,000 m
2.
Two bowling balls each have a mass of 6.8 kg. They are located next to one
another with their centers 21.8 cm apart. What gravitational force do they exert
on each other?
3.
Two spherical balls are placed so their centers are 2.6 meters apart. The Fg
between them is 2.75 x 10-12 N. What is the mass of each ball if one is twice the
mass of the other ball?
2.6 m
m
2m
4.
What is the force of gravity between a 60 kg women and an 80 kg man standing
a) 5.0 m apart
b) .3 m apart
5.
Calculate the force of gravity on a spacecraft 12,800 km above the Earth’s surface
if its mass is 1400 kg. (radius of the earth = 6.38 x 106m, mass of the earth = 5.97
x 1024 kg)
6.
A person has weight of 1000 N, what would their weight be if
a) earth’s radius is ½ & mass is doubled
b) earth’s radius is ¼ & mass is tripled
c) earth’s radius is doubled & mass is ½
d) earth’s radius is tripled & mass is ¼