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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]
2 Z9 D; m4 V G2 M4 [! k
0 a" j7 n3 F% a: c* W[Specify units of 'J', 'kJ', 'MJ' or 'GJ' in your answer.]" V1 o( \2 ~) g: a" R; b' U
+ m+ Z" q" l4 j+ T k* B' ?5 g
p( p, ~6 z+ m7 M# F4 o. d1 Iso far what I have done is used the equation for GPE
9 b, E0 o' n. r& jwhich is 1 N2 _4 r5 W* C4 |" P6 v- ~
U = - (G me m) / r- @. o1 a$ o1 r: L* [' `
( K/ `1 o4 H D/ h6 W! ^where G is 6.674e-11 Nmkg-2
9 c8 k* V5 p9 M2 mme is the mass of the planet 5.1e24 kg 0 p2 H# g! G. e |' V" l" A
m is the mass of the space ship 5.9e4 kg
( r# n2 ?, k) u- K3 X2 u4 r0 n1 {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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