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]

9 u7 N% ^* Q2 }) _# |, H[Specify units of 'J', 'kJ', 'MJ' or 'GJ' in your answer.]

4 w9 x4 S* C1 k; e
9 f  @- D/ P/ t' v% H. {: E* aso far what I have done is used the equation for GPE
which is
U = - (G me m) / r
  m/ k* N3 l. E- [
- i& Y$ n+ B1 M; Z- ~1 r) `& ~, Fwhere G is 6.674e-11 Nmkg-2
- u3 I/ T7 L2 T; U) @8 Q/ k/ Vme is the mass of the planet 5.1e24 kg
m is the mass of the space ship 5.9e4 kg
6 H' m4 R, f+ `& o. J7 a) p; Lr 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

5 T" H% B* ?4 L( B, X" `用这个公式错了么?
2 m: T9 T+ a7 p' a% f2 J还是说只是纯粹的计算出错?

chulinlong

3# Maths


这个公式对的