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] 5 E& e) D) S& P) R 0 i# u1 s+ P# Y% S f. I[Specify units of 'J', 'kJ', 'MJ' or 'GJ' in your answer.]5 m+ W; i( ~' s3 Y8 ?+ V2 q q4 V' _. H
* K# k( ~3 X! w
8 d8 s4 ^& J4 [- @so far what I have done is used the equation for GPE ; e/ I# _! v! `: hwhich is : |6 i* X4 c; Y4 WU = - (G me m) / r % Z& V! U/ g4 j0 u# P8 ]/ ? & V% c8 B7 p$ _& H% dwhere G is 6.674e-11 Nmkg-2 / J# D; P# Q# O9 Z; k7 ~2 M$ ime is the mass of the planet 5.1e24 kg K. T' m1 [3 bm is the mass of the space ship 5.9e4 kg # t; }- c9 z5 C( A/ U4 y- }1 l5 ?
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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