ch11-p032 - 32 We use a right-handed coordinate system with...

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32. We use a right-handed coordinate system with # k directed out of the xy plane so as to be consistent with counterclockwise rotation (and the right-hand rule). Thus, all the angular momenta being considered are along the – # k direction; for example, in part (b) G A =− 40 2 . # t k in SI units. We use Eq. 11-23. (a) The angular momentum is constant so its derivative is zero. There is no torque in this instance. (b) Taking the derivative with respect to time, we obtain the torque: () 2 ˆˆ 4.0k ( 8.0 N m)k dd t t dt dt τ == = G A G . This vector points in the – # k direction (causing the clockwise motion to speed up) for all
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