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]

[Specify units of 'J', 'kJ', 'MJ' or 'GJ' in your answer.]

9 _& R0 W2 V! {* P+ Y4 {
/ e7 _7 A2 w3 s  T% Kso far what I have done is used the equation for GPE
0 P- `  Y) m8 T3 |which is
) C% ^  ~: l% d7 I9 OU = - (G me m) / r

3 v& K  r7 B" G! X8 j' m5 ~" nwhere G is 6.674e-11 Nmkg-2
9 |0 U8 m0 z! W- \me is the mass of the planet 5.1e24 kg
m is the mass of the space ship 5.9e4 kg
5 Q# E9 g) P/ l4 P! |% o. X6 jr 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

& k4 |! N. m: p% i3 o5 f) |' N9 V
$ ~' i+ R, F$ I3 i  j用这个公式错了么?
还是说只是纯粹的计算出错?

chulinlong

3# Maths
% a6 k8 S; w( {! L" x
5 b" l  V& R1 e# O3 T% t( I
这个公式对的