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ch22_p81 - 81(a From Eq 22-38(and the facts that i i = 1...

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81. (a) From Eq. 22-38 (and the facts that # # i i = 1 and # # j i = 0 ), the potential energy is ( ) ( ) ( ) 30 26 ˆ ˆ ˆ 3.00i 4.00j 1.24 10 C m 4000 N C i 1.49 10 J. U p E ª º ª º = − = − + × ¬ ¼ ¬ ¼ = − × G G (b) From Eq. 22-34 (and the facts that # # i i 0 × = and # # # j i = k × ), the torque is G G G τ = × = + × × = − × p E 300 124 10 4000 198 10 30 26 . # # . # . # i 4.00j
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