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Since the lefthand side of this equation is the force given as 80 N, then we can solve for
the combination
mv
2
by multiplying both sides by
r
= 2.0
×
10
7
m. Thus,
mv
2
= (2.0
×
10
7
m) (80 N) = 1.6
×
10
9
J. Therefore,
()
29
8
11
1.6
10 J
8.0
10 J .
22
Km
v
==×
=
×
(b) Since the gravitational force is inversely proportional to the square of the radius, then
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 Spring '08
 Any
 Physics, Acceleration, Circular Motion, Force

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