81. (a) From Eq. 22-38 (and the facts that ##ii=1⋅and ji=0⋅), the potential energy is ()3026ˆˆˆ3.00i4.00j 1.24 10C m4000 N C i1.49 10J.UpE−−ªºªº=− ⋅ =−+×⋅⋅¬¼¬¼=−×GG(b) From Eq. 22-34 (and the facts that ii0×=and ## #ji=k×−), the torque is GGGτ=×=+×⋅ ××⋅−−pE300124 104000198 103026..#.#
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This note was uploaded on 01/25/2011 for the course PHYSICS 17029 taught by Professor Rebello,nobels during the Fall '10 term at Kansas State University.