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A chain of length L and mass per unit length `rho` is piled on a horizontal surface. One end of the chain is lifted vertically with constant velocity by a force P.A. P as function of height x of the end above the surface will be `rho(gx+v^(2))`B. no energy will loss in this process.C. work done by force will be `1/2rhogL^(2)+rhov^(2)L`D. loss in energy `1/2rhogLv^(2)` |
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Answer» Correct Answer - A::C::D `F_(ext)=V_(rel)(dm)/(dt)+m(dv)/(dt)` `(dv)/(dt)=0`(v is contant) `P=rhoxg+rhov^(2)` `w_(P)+w_(g)=DeltaKE` `w_(P)=+underset0oversetLint rhoxgdx+underset0oversetLint(rhodx)v^(2)` `w_(P)=(rhoL^(2)g)/2+rhoLv^(2)` |
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