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]
; m; Z5 ?0 p( S9 V6 W
[Specify units of 'J', 'kJ', 'MJ' or 'GJ' in your answer.]
7 N8 I" x+ w" [! [6 ~# [% T

so far what I have done is used the equation for GPE
/ e3 F5 ~4 m& W! u: F7 T: L- Iwhich is
: L% Q- `# T9 v+ |; VU = - (G me m) / r
- ]( M+ i. Q& N
where G is 6.674e-11 Nmkg-2
me is the mass of the planet 5.1e24 kg
m is the mass of the space ship 5.9e4 kg
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

chulinlong

做出来了 谢谢

Maths

$ a- i. S2 n* \/ X5 C用这个公式错了么?
" [. H5 S1 H9 T: t还是说只是纯粹的计算出错?

chulinlong

3# Maths
/ r, n! U( @- w# U) T, W
% R; l# W( _1 Q' ]& T8 [2 r
1 h1 i" I: Q1 h" {- v! E这个公式对的