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An electric fan rotates 100 times in one...

An electric fan rotates 100 times in one second. If the length of its wing from its axis of rotation is 0.5 m . Then the speed of the fan is ______ m `s^(-1)`

A

`100 pi`

B

`50 pi`

C

`200 pi`

D

100

Text Solution

Verified by Experts

The correct Answer is:
A
Radius of the circular path traced by fan = 0.5 m the number of rotation per second = 100
Speed - `("distance")/("time")= (100 xx (2pir))/ (1 "sencond")`
`100 xx 2 pi xx 0.5 `
`50 xx 2pi= 100 pi m s^(-1)`
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