M 2Mr dr dM = ( 2nr ) dr = T ( 4R ) 2 – T ( 3R ) 2 7R2 . ... 2 g or OC r X =3 8 Vex 8 x р р :: = : The gravitational potential Gm G ( 4m ) 3Gm 6Gm lp rr 9Gm ...
確定! 回上一頁