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Physics - Circular Motion Question with Solution | TestHub

PhysicsCircular MotionMiscellaneousEasy2 minPYQ_2020

PhysicsEasysingle choice

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

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Answer:

Solution:

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, $θ' = 3 θ$

Stream:NTA_ABHYAS_NEETSubject:PhysicsTopic:Circular MotionSubtopic:Miscellaneous

⏱ 2mℹ️ Source: PYQ_2020

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