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]
) |! u/ F3 M0 f/ L9 [. v
[Specify units of 'J', 'kJ', 'MJ' or 'GJ' in your answer.]

5 F* o' a* ^* }8 G4 \$ Q
so far what I have done is used the equation for GPE
which is
U = - (G me m) / r

! s/ _! t4 e, V" N  Q3 w$ Cwhere G is 6.674e-11 Nmkg-2
; F' x. h* Q3 X+ X7 g  |/ Hme 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

+ d4 m# y4 q3 \3 X用这个公式错了么?
还是说只是纯粹的计算出错?

chulinlong

3# Maths
' z+ V, y# a6 x: u6 _) P

' p$ ]' b6 w, {% S. [8 L) P这个公式对的