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 p! ~8 g$ x- ]. G[Specify units of 'J', 'kJ', 'MJ' or 'GJ' in your answer.]

9 M7 \+ E6 C2 w3 v6 p
so far what I have done is used the equation for GPE
which is
6 H/ ]; @3 N+ V, F# iU = - (G me m) / r
8 p$ K: M, q2 `+ V! j% c
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

# b+ h% ?, h: _+ |1 u! ^
! m5 R# ]6 p; T7 K用这个公式错了么?
还是说只是纯粹的计算出错?

chulinlong

3# Maths


这个公式对的