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] + q' @" C8 g( m. I# m ( O8 L7 e1 E0 d3 K& {( I2 j[Specify units of 'J', 'kJ', 'MJ' or 'GJ' in your answer.] / K; v( ? b9 O" Q$ E1 c5 u* V1 [ S4 N8 }6 b4 X4 y+ Y
) n; C+ [7 Y9 H2 }2 o* b! lso far what I have done is used the equation for GPE0 z9 N5 O( g4 \& O8 A; l" a& M
which is 1 I( T J7 D8 D6 u
U = - (G me m) / r5 d1 @- E' `0 E: J2 v5 d
, ` n9 Y& z$ e n
where G is 6.674e-11 Nmkg-2& ]( p: w. U- _$ z4 a% H
me is the mass of the planet 5.1e24 kg . E% h [" D/ c: t; g
m is the mass of the space ship 5.9e4 kg : ~( p1 A1 m8 D0 a: wr 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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