求 一道物理题 12点前

chulinlong

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]
& E  j# O9 n: w: Z
' h* z& g' l9 N[Specify units of 'J', 'kJ', 'MJ' or 'GJ' in your answer.]
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% }0 G( Z4 z4 ^. f9 c- p+ g; uso far what I have done is used the equation for GPE
which is
. ^' Y: j+ i$ Z7 w  A) WU = - (G me m) / r

where G is 6.674e-11 Nmkg-2
+ ]' J: I* ?( y( U! ]- P7 {7 a+ v; V8 Yme is the mass of the planet 5.1e24 kg
4 i. }! x# Z1 w5 lm is the mass of the space ship 5.9e4 kg
+ K' p( J0 \1 {: h  F! S0 br 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

chulinlong

做出来了 谢谢

Maths

/ K, ]" y3 J  n7 P% z
用这个公式错了么?
还是说只是纯粹的计算出错?

chulinlong

3# Maths
, J; E4 e% [3 b% q! C5 X( ~
' Y; A: X' M1 x6 Z6 y- S) L
' s4 ~( s/ }/ A  ~这个公式对的