The angular speed of a flywheel making $120 \, \text{revolutions/minute}$ is:

  • A
    $1 \pi \, \text{rad/sec}$
  • B
    $2 \pi \, \text{rad/sec}$
  • C
    $4 \pi \, \text{rad/sec}$
  • D
    $4 \pi^2 \, \text{rad/sec}$

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