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.]

3 [* t6 ^: V& X/ `5 }
so far what I have done is used the equation for GPE
which is
6 [! C+ d/ J. ?$ q# eU = - (G me m) / r
( J6 l8 w0 f1 B/ z. B  F
, y9 `% h8 J( w* ~8 Hwhere G is 6.674e-11 Nmkg-2
' {$ Y4 T* D, v, p9 B. a4 N. e. Mme is the mass of the planet 5.1e24 kg
m is the mass of the space ship 5.9e4 kg
* ^( ?: Z1 F: Q" I- X+ nr 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

' t- r  u' T0 y# p. G# ?: i' Y/ r用这个公式错了么?
+ W2 u, v9 ^* n; V# {还是说只是纯粹的计算出错?

chulinlong

3# Maths


这个公式对的