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]
+ ?0 z: R' r5 J0 s7 I, n# l
[Specify units of 'J', 'kJ', 'MJ' or 'GJ' in your answer.]
' w$ x( ~2 p! g, e( k) Y" H' \) T1 ]

so far what I have done is used the equation for GPE
which is
U = - (G me m) / r
& n6 F$ e0 V/ }+ \" {4 P
8 l& _) i2 m% T( `* d% Vwhere G is 6.674e-11 Nmkg-2
me is the mass of the planet 5.1e24 kg
# y* Y9 p) ]. d8 }m is the mass of the space ship 5.9e4 kg
8 `$ D2 K$ u2 `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

! X4 h2 G/ U* q1 \+ j- \6 ]; V
. P) s. Y; U( @( i* m2 {用这个公式错了么?
' H7 ?  Z; N( L1 i1 E还是说只是纯粹的计算出错?

chulinlong

3# Maths

- f$ L6 N( N5 l5 Z' n
( k% l" ~$ n* B$ t/ u这个公式对的