1. 104π 2. 2π 3. 4π 4. 12π

Answer: 3. 4π Convert rpm to rad/s using ω=2π N/60 . Δ N=3120-1200=1920 rpm, so Δω=2π×1920/60=64π\ rad/s . α=Δω/t=64π/16=4π\ rad/s² . Option (3).

The angular speed of a fly wheel moving with uniform angular acceleration changes from 1200 rpm to 3120 rpm in 16 seconds. The angular acceleration in rad/s^2 is :

1. \(104\pi\)

2. \(2\pi\)

3. \(4\pi\)

4. \(12\pi\)

Doubtly Asked 30 Oct 2026 NEET UG 2022 Practice test neet Save WhatsApp Report

Best answer

Answer: 3. \(4\pi\)

Convert rpm to rad/s using \(\omega=2\pi N/60\).

\(\Delta N=3120-1200=1920\) rpm, so \(\Delta\omega=\dfrac{2\pi\times1920}{60}=64\pi\ \text{rad/s}\).

\(\alpha=\dfrac{\Delta\omega}{t}=\dfrac{64\pi}{16}=4\pi\ \text{rad/s}^2\). Option (3).

Doubtly AI · 30 Oct 2026 AI-generated · not yet verified Report

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