A disc of radius is rotatating with angular frequency 10 rad/sec. A block of mass 2 kg is to be put on the disc frication coefficient between disc and block is`mu_(K)= 0.4`, then find the maximum distance from axis where the block can be placed without slidding:

Options

A. `2 cm`
B. `3 cm`
C. 4 cm
D. 6cm

Answer

C

Explanation

`mu_(K)g = omega^(2)g`
`0.4 xx 10 = (10)^(2) x`
`x = 4/100 m = 4 cm`