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]. x% R [, a. b5 T
+ o' s6 B) H- H3 P# S7 {' _[Specify units of 'J', 'kJ', 'MJ' or 'GJ' in your answer.] / q+ C7 |- U# v! b2 w0 s7 q ( y& f4 N& q- }! g0 a4 }7 ]: ^) l, _2 ^7 u
so far what I have done is used the equation for GPE - e5 _& h3 F7 Q. _which is 4 B/ k& I. E% U2 v
U = - (G me m) / r ( a5 O# n' ~" \5 D4 R$ o! k+ w1 C @$ ~
where G is 6.674e-11 Nmkg-20 w k7 k* c5 c
me is the mass of the planet 5.1e24 kg 5 j3 W j8 D9 o7 ]
m is the mass of the space ship 5.9e4 kg ' z' F1 a" Y- b: x6 g
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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