question_answer

Uniform rod AB is hinged at end A in horizontal 5 position as shown in the figure. The other end is connected to a block through a massless string as shown. The pulley is smooth and massless. Masses of block and rod is same and is equal to m. Then acceleration of block just after release from this position is

A) 6g/13               

B) g/4

C) 3g/S                             

D) None

Correct Answer: C

Solution :

\[\alpha =\frac{a}{1}\]                                                   ? (ii) \[mg-T=ma\]                                          ? (i) \[Tl-mg\frac{1}{2}\,=\,\frac{m{{l}^{2}}}{3}\alpha \]                             ? (iii) Solving the above equations: \[a=\frac{3g}{8}\]