Rotational Motion Question 170

Question: The instantaneous angular position of a point on a rotating wheel is given by the equationθ(t)=2t36t2 . The torque on the wheel becomes zero at

Options:

A) t=1s

B) t=0.5s

C) t=0.25s

D) t=2s

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Answer:

Correct Answer: A

Solution:

[a] When angular acceleration

α is zero then torque on the wheel becomes zero.

θ(t)=2t36t2dθdt=6t212t

α=d2θdt2=12t12=0t=1sec.



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