1.

A small body with relative density d_(1) falls in air from a height 'h' on to the surface of a liquid of relative density d_(2) where d_(2)gt d_(1).The time elapsed after entering the liquid to the instant when it comes to instantaneous rest inside liquid

Answer»

`SQRT((2h)/(G))(d_(2))/(d_(1))`
`sqrt((2h)/(g))((d_(1))/(d_(2)-d_(1)))`
`sqrt((2h)/(g))(d_(1))/(d_(2))`
`sqrt((2h)/(g))((d_(2)-d_(1)))/(d_(1))`

Solution :`(DQ)/(DT)=-KA (dT)/(dx)=-alphaTA (dT)/(dx)`
`(dQ)/(dt)=-alphaAT(dT)/(dx)impliesi=-alphaAT(dT)/(dx)implies iintdx =- alphaAunderset(T_(1))OVERSET(T_(2))intTdT`
`implies i(l)=alphaA((T_(1)^(2)-T_(1)^(2)))/(2)implies i=(alphaA)/(2l)(T_(1)^(2)-T_(2)^(2))`


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