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]
/ e2 J2 t$ c! F6 [  U& V( |
[Specify units of 'J', 'kJ', 'MJ' or 'GJ' in your answer.]
0 ?6 B# o% X! c+ K6 x" O' m

3 O' R; Q  ~0 G/ f8 U7 h% r8 ?* K5 _so far what I have done is used the equation for GPE
which is
U = - (G me m) / r

5 T/ G5 E& b7 |! r% awhere G is 6.674e-11 Nmkg-2
me is the mass of the planet 5.1e24 kg
1 R6 N0 G- q5 q3 n0 C9 |m is the mass of the space ship 5.9e4 kg
% w1 j* q1 Z* P. L$ Q" @1 `( b& Cr 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

2 U, ]2 x! I; ]3 X) n
用这个公式错了么?
还是说只是纯粹的计算出错?

chulinlong

3# Maths


这个公式对的