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]

[Specify units of 'J', 'kJ', 'MJ' or 'GJ' in your answer.]

* a. [/ G4 B5 f
! {. Q' @; T1 Z+ g" N. Y" hso far what I have done is used the equation for GPE
which is
1 e3 @, y' ?$ @" ~% D8 XU = - (G me m) / r

) |+ t% u' k* L% p" z: Ewhere 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
+ b6 X3 u. m* j4 T" M& q6 t$ @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

% n9 O% ~) _0 \+ G% d7 e
用这个公式错了么?
, @  _4 y& w0 p7 J. d. f: ]- V还是说只是纯粹的计算出错?

chulinlong

3# Maths
1 ~* {5 i" A$ n* a  @

这个公式对的