73. We choose positive coordinate directions (different choices for each item) so that each is accelerating positively, which will allow us to set aaR12==α(for simplicity, we denote this as a). Thus, we choose upward positive for m1, downward positive for m2and (somewhat unconventionally) clockwise for positive sense of disk rotation. Applying Newton’s second law to m1m2and (in the form of Eq. 10-45) to M, respectively, we arrive at the following three equations. Tmgmamg TmaTR TR I1111222221−=(a) The rotational inertia of the disk is
This is the end of the preview. Sign up
access the rest of the document.