InterviewSolution
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InterviewSolution
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(a) Why can we not associate a potential energy with the frictional force as we did with the gravitational force ? (b) A uniform chain of mass m and length I is lying on a table with `(1//4)` of its length hanging freely from the edge. Find the amount of work required to be done in dragging the chain on the table completely. |
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Answer» (a) We cannot recover the energy lost due to frictional effects. (b) Mass of `(1//4)` length of the chain =` m//4` the weith `(mgh//4)` of this part of the chain acts an its CG which is at a distance `(i//8)` from the edga. Work done in dragging the chain on the table completely = force`xx` distacne = weight of the `(I//4)` length of the chain `xx` distance through its CG is to be moved = `(mg//4) (I/8) = mgl//32`. |
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