1.

A disc of mass m is connected with an ideal spring of spring constant k inside a lift as shown. The left starts moving with constant acceleration (a hat (i)- a hat (j)). At the same moment disc starts rolling without sliding on the wall of lift (from rest). If spring is in natural length initially then friction force acting on disc as a function of y is given by : (y is the displacement of the disc with respect to lift)

Answer»

`-ky`
`(2)/(3)(MG + ma-ky)`
`(1)/(3) (mg +ma-ky)`
`mg+ma-2ky`

SOLUTION :`((mg + ma - ky)R)/((3)/(2)mR^(2)) = (FRR)/((1)/(2)mR^(2))`
`rArr fr = (1)/(3) (mg + ma - ky)`


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