question_answer

                          A rod PQ of mass M and length L is hinged at end R The rod is kept horizontal by a massless string tied to point Q as shown in figure. When string is cut, the initial angular acceleration of the rod is       

A) g/L

B) 2g/L

C) \[\frac{2g}{3L}\]           

D) \[\frac{3g}{2L}\]

Correct Answer: D

Solution :

[d]       angular acceleration \[\alpha =\frac{3g}{2L}\]