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]& g+ @5 \% ?1 [( i& J0 {# l
. Y. W1 s3 V# W[Specify units of 'J', 'kJ', 'MJ' or 'GJ' in your answer.] " A( Q; J8 u/ r$ P* A5 w% Q & A1 f( i5 w9 t9 Q5 a6 H- \, C% _6 Y# Z3 l) ]- j
so far what I have done is used the equation for GPE - E& s/ [6 ~+ j7 r2 b* Qwhich is l" e( h" Q4 N9 r/ k3 JU = - (G me m) / r6 Y7 f C5 T! b b
; J* j0 S* o% q9 b9 T3 j
where G is 6.674e-11 Nmkg-2# X0 d B ?& V
me is the mass of the planet 5.1e24 kg , ?) \6 s7 ^# ^. X6 im is the mass of the space ship 5.9e4 kg 2 B$ Y1 t1 s5 t. u5 @
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
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发表于 2009-11-10 21:41
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