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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]
! n# {5 H3 Z2 |, V1 {/ t: O5 V0 N0 D% R) M" [. t+ D) q% m
[Specify units of 'J', 'kJ', 'MJ' or 'GJ' in your answer.]
- h. m% ^" k! b+ Y7 n" K, S1 d6 t- F( X. [) M. C
@% U" h \+ O: cso far what I have done is used the equation for GPE
8 a3 W& c9 N; `3 _7 Dwhich is ; B [9 t5 u' q6 x$ G, Z* m2 P
U = - (G me m) / r) N1 [( M. C$ S! D
4 p% l2 E$ Q. {3 x1 [) z
where G is 6.674e-11 Nmkg-2
, @9 P5 S% }3 U5 lme is the mass of the planet 5.1e24 kg
" M) y3 V- b' [! u Qm is the mass of the space ship 5.9e4 kg ( L. L; ?- k7 h8 R ^
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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狗仔卡
发表于 2009-11-10 21:41
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