Question

A string breaks if its tension exceeds 10 newton. A stone of mass 250 g tied to this string of length 10 cm is rotated in a horizontal circle. The maximum angular velocity of rotation can be

(A) 20 rad/s 

(B) 40 rad/s

(C) 100 rad/s 

(D) 200 rad/s

Answer 1

Answer is (A) 20 rad/s

Using, 

T = mω²r

∴ 10 = 0.25 x ω² x 0.1

∴ω = 20 rad/s