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
Explanation
F = (frac{mv ^2}{r})
= (mω^2r)
(Since V = ωr)
F = 10(^{-2}) x 100(^2) x 0.2
F =20 N