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[其他] 求 一道物理题 12点前

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发表于 2009-11-10 21:41 | 显示全部楼层 |阅读模式
老杨团队,追求完美;客户至上,服务到位!
A space craft of mass 5.9×104 kg is in orbit around a planet of 5.1×1024 kg. If the planet can be assumed to be a uniform sphere of radius 5.4×106 m and the space ship is orbit a height of 6.9×105 m above the surface what is the gravitational potential energy of the ship? [G=6.674×10-11 Nm2kg-2]
' `* E7 Q( R* F' m/ f/ w4 V; ?: O4 X; S! R/ g! q6 M
[Specify units of 'J', 'kJ', 'MJ' or 'GJ' in your answer.]( [6 E6 c0 T0 p6 B! v' V7 \

4 {$ Q! y# ~" D7 |; Y# m
' P$ s2 r( v0 `2 R5 q. p8 ]7 `so far what I have done is used the equation for GPE
, \8 p: _: W6 G, z  G0 S/ G" {8 Vwhich is 9 ^: G" ~: N% k( [# q  B# O
U = - (G me m) / r
9 U( @/ M- n- x. c
' x& |; ?- m% O) v/ [4 @! s1 {where G is 6.674e-11 Nmkg-2
7 u% g2 i4 d7 X5 @7 D" K' kme is the mass of the planet 5.1e24 kg ! y" H; ]3 p3 G, t4 I' c3 K# E
m is the mass of the space ship 5.9e4 kg
0 H8 _8 D$ b) z+ `3 _r is (i think) the radius of the planet (5.4e4 m) added to the height of the space ship is above the planet (6.9e5 m) and then divided it into G me m
理袁律师事务所
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 楼主| 发表于 2009-11-10 22:03 | 显示全部楼层
做出来了 谢谢
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发表于 2009-11-10 22:50 | 显示全部楼层

' ^  C, g% ~1 i# k" T/ @
# ^: z& q! B' T用这个公式错了么?  |: e3 J9 n) k% A& @% B; B( o: ?
还是说只是纯粹的计算出错?
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 楼主| 发表于 2009-11-11 10:13 | 显示全部楼层
老杨团队 追求完美
3# Maths
5 S5 Y% k6 L& W+ _' j
2 R" I, ~, A9 q! I8 y! c  ~( ?- L. A9 `8 B$ J$ U
这个公式对的
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