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.]


so far what I have done is used the equation for GPE
which is
" J7 p5 |  @9 E3 r- PU = - (G me m) / r
+ C* C* i+ b( y) O" J5 E
* p; ?; ?9 x7 Z$ ]  L. gwhere 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

! K+ o' m1 T5 q$ B  a% A6 k+ }3 d
用这个公式错了么?
4 T  ~6 v8 g: I* J9 u, W0 \还是说只是纯粹的计算出错?

chulinlong

3# Maths


# m, j8 a9 k- H  c0 O0 Y) V这个公式对的