Questions
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 [NEET 2013)
detailed solution
Correct option is A
When the string is cut, the rod can be shown asTorque on the rod = Moment of weight of the rod about P,τ=MgL2 …(i)∵ Moment of inertia of rod about P,I=ML23 . ..(ii)As, τ=IαFrom Eqs. (i) and (ii), we getMgL2=ML23α∴ The initial angular acceleration of the rod, α=3g2LTalk to our academic expert!
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