InterviewSolution
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InterviewSolution
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Three spools `A, B` and `C` each having moment of inertia `I=MR2//4` are placed on rough ground and equal force `F` is applied at positions as shown in the figures (a), (b) and (c). Then A. frictional force on spool `A` acts in forward directionB. frictional force on spool `A` acts in backward directionC. frictional force on spool `B` acts in forward directionD. frictional force on spool `B` and `C` acts in backward direction |
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Answer» Correct Answer - A::D For figure `A` and `B` If `k^(2)gtRx` friction will act in backward direction otherwise in forward direction. For given spool `K^(2)=(R^(2))/4` Figure a `Rx=R.R/3=(R^(2))/3` friction forward Fig b `R=R.R/4=(R^(2))/5` friction backward. In figure c as force is below the diametric plane, hence friction backward. |
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