 鲜花( 0)  鸡蛋( 0)
|
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 F* S4 w7 h% {! H
0 f( L, M3 x3 R& {0 y8 Z) Y: z[Specify units of 'J', 'kJ', 'MJ' or 'GJ' in your answer.]# D! S1 P7 k. |
5 b3 j/ F. f, v% B! D* H8 u
$ F4 }1 h& X. Q* \& j9 _3 qso far what I have done is used the equation for GPE p6 o2 _* x, }( G' t% \
which is 2 F3 c) a8 ^, X9 O" F& |. D- G+ k
U = - (G me m) / r
7 m( V% M, V$ G9 R6 f5 F4 |4 `' k, |$ w# N
where G is 6.674e-11 Nmkg-2& @- Q5 K/ s5 V6 e# i" Y8 v
me is the mass of the planet 5.1e24 kg - ]& l3 h+ E& s! u8 e6 S; x
m is the mass of the space ship 5.9e4 kg 9 ^* t4 u/ f$ L( W w2 D
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 |
|
狗仔卡
发表于 2009-11-10 21:41
提升卡
置顶卡
沉默卡
喧嚣卡
变色卡
显身卡
楼主
$ Y# v8 U* L% j