ch13-p035 - 35. (a) The work done by you in moving the...

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11 3 2 11 22 2 () 0.12 m 2(0.040 m) (6.67 10 m /s kg)(0.010 kg)(0.080 kg 0.020 kg) (0.040 m)(0.12 0.040 m) 5.0 10 fi B A C BA C B A C WU UG mm m dL d L dd Ld d L Gm m m Gm m m dL d ªº §· =− = + ¨¸ «» −− ©¹ ¬¼ =+ = × 13 J. (b) The work done by the force of gravity is ( U f U i ) = 5.0 × 10 13 J. 35. (a) The work done by you in moving the sphere of mass m B equals the change in the potential energy of the three-sphere system. The initial potential energy is
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