Q107 / 200 · NEET 2022 (Phase 1) · Physics

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:

  • Correct answer
    A
    4π
  • B
    12π
  • C
    104π
  • D
    2π

Solution

For uniform angular acceleration we can write,

ω=ω0+αt⇒α=ω-ω0t

Given, ω=3120 rpm=3120×2π60=104π rad s-1

and ω0=1200 rpm=1200×2π60=40π rad s-1

Therefore, α=104π rad s-1-40π rad s-116=4π rad s-2

Hence, the correct answer is option: 'A'.

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