Chapter: Rotational Dynamics· Physics

A torque of magnitude 400 Nm acting on a body of mass 40 kg produces an angular acceleration of 20 rad/s2. Calculate the moment of inertia of the body.

Q.12 A torque of magnitude 400 Nm acting on a body of mass 40 kg produces an angular acceleration of 20 rad/s². Calculate the moment of inertia of the body.

Doubtly Asked 29 Oct 2026 Board exam · July 2024 hsc 12th Save WhatsApp Report

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Answer: \(I = 20\) kg m\(^2\)

\(\tau = I\alpha\), so

\[I = \frac{\tau}{\alpha} = \frac{400}{20} = 20\ \mathrm{kg\,m^2}\]

(The mass of the body is not needed.)

Doubtly AI · 29 Oct 2026 AI-generated · not yet verified Report

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A torque of magnitude 400 Nm acting on a body of mass 40 kg produces an angular acceleration of 20 rad/s2. Calculate the moment of inertia of the body.

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