Problem : A membrane of uniform density a per unit arca is stracthed on a Circular frame of radius a' to uniform stress ac? , where at t = 0 fthe membrane is released from rest in the position u = €(a² – r2) , where ɛ is small and r is the distance from the centre. Show that the displacement of the centre at time t is 8ea? E cos (En ) =1 Ji(En)

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