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]
5 m' g  s, Q) D8 E
7 A- M# h/ u& @$ g2 Q[Specify units of 'J', 'kJ', 'MJ' or 'GJ' in your answer.]
! H* f9 \4 Y6 l; R! E
: U% S/ L: j, V- K, P
so far what I have done is used the equation for GPE
which is
U = - (G me m) / r

3 ~4 |4 w* d% f, L0 z5 Y7 }" ywhere G is 6.674e-11 Nmkg-2
me is the mass of the planet 5.1e24 kg
# B& {8 c" ]7 y8 hm is the mass of the space ship 5.9e4 kg
5 e# [; l5 `3 Vr 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

) ]& B4 G4 C2 X8 N用这个公式错了么?
9 o1 Z9 W6 o& [. {( J/ \" \) }5 B" q还是说只是纯粹的计算出错?

chulinlong

3# Maths
+ P9 Q6 P' `7 L6 Q& z) N" }

: v9 D; @( D" a& k这个公式对的