An electric fan has blades of length `30 cm` as measured from the axis of rotation. If the fan is rotating at `1200 rpm`, find the acceleration of a point on the tip of a blade.

Options

A. `1600m//s^(2)`
B. `4740m//s^(2)`
C. `2370m//s^(2)`
D. `5055m//s^(2)`

Answer

B

Explanation

`r=0.3m`
`omega=(2piN)/(60)=(2pixx1200)/(60)=40 pi rad//s`
`a_(c)=omega^(2)r=(40pi)^(2)xx0.3=4740 m//s^(2)`