Particles of mass 10^-2kg is fixed to the tip of a fan blade which rotates with angular velocity of 100rad-1. If the radius of the blade is 0.2m, the centripetal force is

A. 2 N
B. 20 N
C. 200 N
D. 400 N

Correct Answer:

Option B – 20 N

Explanation

F = mv²/r

= mω²r

(Since V = ωr)

F = 10¯²x 100² x 0.2

F = 20 N