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Circular Motion

Section: Physics

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Question : 53 of 76

Marks: +1, -0

A fly wheel is accelerated uniformly from rest and rotates through 5 rad in the first second. The angle rotated by the fly wheel in the next second, will be:

[24-Jun-2022-Shift-2]

$7.5 \text{rad}$
$15 \text{rad}$
$20 \text{rad}$
$30 \text{rad}$

Solution:

\theta_1 = \frac{1}{2} \alpha (2 \times 1 - 1) = 5 \text{rad}

\Rightarrow \alpha = 10 \text{rad} / \text{sec}^2

So

\theta_2 = \frac{1}{2} \times \alpha (2 \times 2 - 1) = 15 \text{rad}

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