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Physics - Rotation Question with Solution | TestHub

PhysicsRotationRotational KinematicsHard2 minPYQ_2018

PhysicsHardsingle choice

An elevator starts going up with an acceleration $2 m / s^{2}$ . If radius of the wheel attached to the elevator is $0.1 m$ , then find out number of revolutions in $10 s$ .

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Answer:

Solution:

$θ = 2 πn = \frac{1}{2} (α) t^{2}$ $n = \frac{1}{2} (\frac{a}{r}) \frac{t ^{2}}{2 π}$ Here, $a = 2 m / s^{2}, r = 0.1 m, t = 10 s, n =$ ? $∴ n = \frac{1}{2} (\frac{2}{0.1}) \frac{1 0 ^{2}}{6.28} \approx 160$

Stream:AIIMSSubject:PhysicsTopic:RotationSubtopic:Rotational Kinematics

⏱ 2mℹ️ Source: PYQ_2018

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