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Question

A wheel rotates with a constant angular acceleration of 2.0 rads2. If the wheel starts from rest, how many revolutions will it make in the first 10 seconds? 



A

32

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B

8

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C

16

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D

4

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Solution

The correct option is C

16


The angular displacement in the first 10 seconds is given by

θ = ω0t + 12at2 = 12(2.0rads2)(10s)2 = 100 rad.

As the wheel turns by 2π radian in each revolution, the number of revolutions in 10 s is

n = 1002π 16.


Physics

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