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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]
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[Specify units of 'J', 'kJ', 'MJ' or 'GJ' in your answer.], O s8 q- |& ^- o
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so far what I have done is used the equation for GPE' ^: S9 r" P* U1 G, F8 E' y7 U2 q
which is * f& ~+ x8 r, ~' S
U = - (G me m) / r; _" D4 b" E1 D" y4 u: m& l
* P1 N: x* M, u8 W2 K; _where G is 6.674e-11 Nmkg-2
9 e- [, @4 R4 C9 t t9 l9 ~1 A' Ume is the mass of the planet 5.1e24 kg 9 Y% M( u% u5 ?2 m$ f
m is the mass of the space ship 5.9e4 kg - K, x9 q" t: E3 |- g% u: 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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