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55. In our system, we have
m
1
=
m
2
=
M
(the mass of our Sun, 1.99
×
10
30
kg). With
r
=
2
r
1
in this system (so
r
1
is onehalf the EarthtoSun distance
r
), and
v =
π
r/T
for the
speed, we have
()
2
23
12
1
2
2
.
2
rT
Gm m
r
mT
rr
G
M
=
¡
=
With
r
= 1.5
×
10
11
m, we obtain
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 Spring '08
 Any
 Physics, Mass

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