. A rod PQ of mass M and length L is hinged at end P 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

Best Answer


The formula of torque is Torque = mass × acceleration × length.

Before curtting the rod the torque was acting at the center of rod and its value is 85

Assume the initial angular acceleration of rod as μ.

On cutting the string, after the torque become balanced at point Q we get:


Final Answer:

Hence, option A is correct


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