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51. (a) The period of the comet is 1420 years (and one month), which we convert to
T
=
4.48
×
10
10
s. Since the mass of the Sun is 1.99
×
10
30
kg, then Kepler’s law of periods
gives
2
10
2
3
13
11
3
2
30
4
(4.48
10 s)
1.89
10
m.
(6.67 10
m /kg s )(1.99
10 kg)
aa
π
−
§·
×=
¡
=×
¨¸
×⋅
×
©¹
(b) Since the distance from the focus (of an ellipse) to its center is
ea
and the distance
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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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