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]

( ?2 W9 g1 U6 e  f: p6 s[Specify units of 'J', 'kJ', 'MJ' or 'GJ' in your answer.]
: a' ~9 G4 z, r6 t* C; a

so far what I have done is used the equation for GPE
+ `+ f: \, w* n9 ~2 ^# Qwhich is
U = - (G me m) / r
9 o) z4 Q) p8 X
where G is 6.674e-11 Nmkg-2
# g: t& r5 f( m, F- ]5 t. M0 Xme 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

  s: A8 ]% R6 l) G' J) F3 }用这个公式错了么?
还是说只是纯粹的计算出错?

chulinlong

3# Maths

2 \: v8 Q4 H# _( ~4 H' z
这个公式对的