ch10-p073 - 73 We choose positive coordinate...

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73. We choose positive coordinate directions (different choices for each item) so that each is accelerating positively, which will allow us to set aa R 12 == α (for simplicity, we denote this as a ). Thus, we choose upward positive for m 1 , downward positive for m 2 and (somewhat unconventionally) clockwise for positive sense of disk rotation. Applying Newton’s second law to m 1 m 2 and (in the form of Eq. 10-45) to M , respectively, we arrive at the following three equations. Tm gm a mg T ma TR TR I 11 1 1 22 2 2 21 −= (a) The rotational inertia of the disk is
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