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], x0 A: j% o5 v2 h3 z: x& M
8 b. H. d2 |: A. x
[Specify units of 'J', 'kJ', 'MJ' or 'GJ' in your answer.]" ?" l- T3 N( J/ D( A* j* V' a
" V5 H; ^- q8 E* ~# A
% q$ @9 y/ w- F' R/ N* s+ E
so far what I have done is used the equation for GPE5 @( M8 ~( j4 B2 h u$ ]
which is " I4 e+ H4 t% n, p6 ^
U = - (G me m) / r1 S3 g) R! c( j* F& v! I- |6 Q- |6 T
1 `) V8 }( D/ L/ l* J1 P; g5 _: J
where G is 6.674e-11 Nmkg-2) F( p# J' S1 B" p
me is the mass of the planet 5.1e24 kg # q( `. _: c( ]
m is the mass of the space ship 5.9e4 kg 6 y" H: b& p3 O5 \% W% A
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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