Chapter 18.2, Problem 2aTH

Parts i−iv refer to the instant shown in the diagram below.

1. For each block, state whether the angular acceleration is in a clockwise sense, in a counterclockwise sense, or zero. Explain.
2. Rank the magnitudes of the angular accelerations of the blocks $\left(a_1,a_2,a_3\right)$ . Explain.
3. The diagrams on the previous page have been reproduced below. Sketch a vector on each block to indicate the direction of the acceleration of the center of mass $\left({\stackrel{\to }{a}}_{\text{cm}}\right)$ of that block. If for any block ${\stackrel{\to }{a}}_{\text{cm}}=0$, state the explicitly. Explain.



4. Rank the magnitudes of the accelerations of the centers of mass of the block $\left(a_{\text{cm1}},a_{\text{cm2}},a_{\text{cm3}}\right)$ . Explain.