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70. We estimate the planet to have radius
r
= 10 m. To estimate the mass
m
of the planet,
we require its density equal that of Earth (and use the fact that the volume of a sphere is
4
π
r
3
/3):
3
33
4/
3
4
/
3
E
E
EE
mM
r
rR
R
§·
=
¡
=
¨¸
ππ
©¹
which yields (with
M
E
≈
6
×
10
24
kg and
R
E
≈
6.4
×
10
6
m)
m
= 2.3
×
10
7
kg.
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This note was uploaded on 05/17/2011 for the course PHY 2049 taught by Professor Any during the Spring '08 term at University of Florida.
 Spring '08
 Any
 Physics, Mass

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