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

B

8

C

16

D

4

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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