In the figure shown a thin light inextensible string is wrapped around a uniform disc. One end of the strin is fixed to the ceiling of the lift and the other end is fied to the circumference of the disc. Acceleration `'a'` of the lift is such that the centre of the disc not move with respect to ground. Find the value of `(a)/(g)`. String does not slip on pulley.

Answer

2

Explanation

`a_(A) = a = alpha.R` …….(i)
`T - mg = 0` ……(ii)
`T.R = (mR^(2))/(2).alpha"……….."(iii)`

`:. g = (a)/(2)`