Q.

A man carrying a monkey on his shoulder does cycling smoothly on a circular track of radius 9 m and completes 120 revolutions in 3 minutes. The magnitude of centripetal acceleration of monkey is (in m/s2)                 [2024]

1 4π2 ms-2  
2 57600π2 ms-2  
3 16π2 ms-2  
4 Zero  

Ans.

(3) 

        Given : R = 9m and 120 revolutions in 3 min

        Angular velocity, ω=120 Rev.3 min.=120×2π rad3×60 sec=4π3rad/s

        acentripetal=ω2R=(4π3)2×9=16π2 m/s2