 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]- }# N1 l- N2 u E: H M& q; _7 T8 b
' y& W- i, @; V
[Specify units of 'J', 'kJ', 'MJ' or 'GJ' in your answer.]
* V, V8 M4 a) e, v( r7 r) A2 u
+ l1 v2 L, E0 a3 T) G9 \% p. D% ?% O* l' A% e
so far what I have done is used the equation for GPE9 p+ c7 }$ O s) r
which is + d, _9 P: p: B H
U = - (G me m) / r O" K$ ]: P' ~: U
4 y" J; }% Q; S# J( t. S' I
where G is 6.674e-11 Nmkg-2; ~* q% G, {5 h5 C: t8 G
me is the mass of the planet 5.1e24 kg
- {4 W8 z# h2 N7 [6 ]! Y3 fm is the mass of the space ship 5.9e4 kg - Y, X- l7 c, M3 H, ~0 @
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
