Questions
A cord is wrapped on a pulley (disk) of mass M and radius R as shown in figure. To one end of the cord, a block of mass M is connected as shown and to other end in (a) a force of 2 Mg and in (b) a block of mass 2M. Let angular acceleration of the disk in A and B is , respectively, then (cord
is not slipping on the pulley).
detailed solution
Correct option is B
In figure, T2−T1R=MR22αAT1−Mg=MaAT2=2MgaA=RαAαA=2g3RFrom figure,T2−T1×R=MR22αBT1−Mg=MaB2Mg−T2=2MaBaB=RαBαB=2g7RSo, αA>αBTalk to our academic expert!
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A uniform rood AB of length and mass is free to rotate about point A. The rod is released from rest in the horizontal position. Given that the moment of inertia of the rod about A is , the initial angular acceleration of the rod will be
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