A disc initially at rest, is rotated about its axis with uniform angular acceleration. In the first 2 s, it rotates an angle θ . In the next 2 s , the disc rotates through an angle

Question

TestHub · Accepted Answer

Because of uniform angular acceleration. we can use the equation of motion in rotation

$θ = \frac{1}{2} α {(2)}^{2} [ω_{0} = 0]$

$θ = 2 α$

And
$θ + θ' = \frac{1}{2} α {(2 + 2)}^{2} [∵ ω_{0} = 0]$

$θ + θ' = 8 α$

Hence, $θ' = 3 θ$

Physics - Circular Motion Question with Solution | TestHub

Options:

Doubts & Discussion