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], H$ s j# B4 {0 z* S3 F E
5 ^# w3 u$ ]; Z7 ?/ O
[Specify units of 'J', 'kJ', 'MJ' or 'GJ' in your answer.] 5 `3 M+ s( _4 f3 A9 \6 F0 w6 D2 m
) w& e3 p6 P* i8 [7 V1 ]! tso far what I have done is used the equation for GPE7 e8 r; I: p ~- ^
which is 0 t X! B w0 R8 \
U = - (G me m) / r# a B* e9 c3 ?+ L+ q7 i
* `# S8 z4 }5 H8 r1 o j. y
where G is 6.674e-11 Nmkg-2 6 I7 H$ @6 N& g* r& o- D5 Qme is the mass of the planet 5.1e24 kg ) w# u, p0 ` s$ h* A; B& z
m is the mass of the space ship 5.9e4 kg ( c& E0 D5 ]$ D( r- v
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
鲜花(
鸡蛋(
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
