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.]
% f  r1 X; q4 R3 R) L. u1 F( j8 ^
' I  {2 R: o3 p4 j  {$ f
4 [) z( D8 [3 ?2 H* jso far what I have done is used the equation for GPE
which is
- W8 N" D, l, i$ M$ ?/ P8 fU = - (G me m) / r

; Y5 a' \: K, Q6 n4 Q4 {7 k0 [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

2 V% i" o) O2 K/ Q5 }% Y3 ^
9 j6 D# @& e- p5 J用这个公式错了么?
3 J( x+ @; G4 t还是说只是纯粹的计算出错?

chulinlong

3# Maths
) f: c3 D! j- }: a

; D* q9 \/ r% V& Q& o这个公式对的