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]
7 U4 ?% B9 l# z. \
[Specify units of 'J', 'kJ', 'MJ' or 'GJ' in your answer.]
5 |+ G% J' ^. L4 n6 p7 ?

: O3 ^4 s; S  v2 d9 Q- Aso far what I have done is used the equation for GPE
which is
U = - (G me m) / r

where G is 6.674e-11 Nmkg-2
6 E6 n/ A- Z( N9 F: ?0 Tme is the mass of the planet 5.1e24 kg
7 p) u1 q9 T& pm is the mass of the space ship 5.9e4 kg
! t, y! G* ~- A: V, gr 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

' G! C: u+ e* F
用这个公式错了么?
. C/ ]7 E1 Y+ h/ R! d还是说只是纯粹的计算出错?

chulinlong

3# Maths
( c) [) a' u% \* h! P$ \
8 K7 R5 V) L" H, E
0 V2 o' ]$ j! g1 \这个公式对的