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Physics - Rotation Question with Solution | TestHub

PhysicsRotationRotational KinematicsMedium2 minPYQ_2021

PhysicsMediumsingle choice

The moment of inertia of a body about a given axis is $1.2 kg \cdot m^{2}$ . Initially the body is at rest. In order to produce rotational kinetic energy of $1500 J$ , an angular acceleration of $25 rad / s^{2} must$ be applied about an axis for a time duration of

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Solution:

$I = 1.2 kg - m^{2}, K . E . = 1500 J, α = 25 rad / s^{2} K.E. = \frac{1}{2} I ω^{2} ∴ 1500 = \frac{1}{2} \times 1.2 \times ω^{2} ω = 50 rad / s ω = ω_{0} + α t 50 = 0 + 25 t = 25 t t = 2 s$

Stream:MHT_CETSubject:PhysicsTopic:RotationSubtopic:Rotational Kinematics

⏱ 2mℹ️ Source: PYQ_2021

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