A length of massless thread is wound around a solid spool of mass \(M\) and radius \(R\). The end of the thread is attached to a horizontal bar as shown in the figure. If the solid spool of thread is dropped from rest and falls without slipping, its acceleration will be:
Hint: You will need to look up the moment of inertia for the solid spool of thread. You should assume it is a “solid disk or cylinder about a cylinder axis”.
\(3g \over 4\)
\(2g \over 3\)
\(g \over 2\)
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