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Physics - Rotation Question with Solution | TestHub

PhysicsRotationRotational KinematicsEasy2 minPYQ_2016

PhysicsEasysingle choice

A uniform circular disc of radius $50 cm$ at rest is free to rotate about an axis which is perpendicular to its plane and passes through its centre. It is subjected to a torque which produces a constant angular acceleration of $2.0 r a d s^{- 2}$ . Its net acceleration in $m s^{- 2}$ at the end of $2.0 s$ is approximately:NEET 2016 (Phase 1)

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Answer:

Solution:

At the end of $2 sec,$ $w = w_{0} + α t$

$w = 0 + 2 (2) = 4$ $rad/sec$

Particle acceleration towards the center is $= a_{c} = r w^{2}$

$a_{c} = \frac{1}{2} {(4)}^{2} = 8 {m/s}^{2}$

Tangential acceleration $a_{t} = α \cdot R$

$= 1 {m/s}^{2}$

$a_{net} = \sqrt{a_{c}^{2} + a_{t}^{2}}$

$= \sqrt{8^{2} + 1^{2}}$

$= \sqrt{65} \approx 8$ (approximately)

Stream:NEETSubject:PhysicsTopic:RotationSubtopic:Rotational Kinematics

⏱ 2mℹ️ Source: PYQ_2016

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