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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]2 h1 |: ^: @6 Q1 y6 M

6 l" ?! V8 a- {" Y' d[Specify units of 'J', 'kJ', 'MJ' or 'GJ' in your answer.]' O) d" F. N( G/ P6 i1 ]

% ?" }' z/ v/ g# r" c* X
6 p+ o* E. h; S0 |, U3 Mso far what I have done is used the equation for GPE
. U2 i! V3 n5 F( _# c: T' Lwhich is
( I6 V, v$ V# G$ X4 f. H8 jU = - (G me m) / r
5 A  c2 j- ?: |' ]) y8 G+ w" s+ \" a9 J. j
where G is 6.674e-11 Nmkg-25 a9 J. d0 |* Y6 }3 |
me is the mass of the planet 5.1e24 kg
+ Q+ u* C- b! w- Q* {m is the mass of the space ship 5.9e4 kg
8 |& z$ T1 f3 N4 [8 C$ Mr 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
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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

+ |4 W; H0 m1 @; ~7 }5 s% A/ P7 \8 U8 w
用这个公式错了么?
: v8 J( `' P6 g  y# J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   b7 x0 U( O4 _- e

3 O8 V# b; `5 o5 E2 f% t% u' d0 t( g7 {; L+ X8 d: ]
这个公式对的
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