One revolution of the second hand – 360 ° or 2p rad.
This means that in 20 revolutions the second hand will turn to:
360 * 20 = 7200 ° or 2p * 20 = 40p rad.
To find the angular velocity, you need to divide the angle of rotation by time.
ω = φ / t.
One revolution of the second hand is equal to a minute, 20 revolutions will take 20 minutes.
20 minutes = 1200 s.
40p / 1200 = p / 30 = 0.105 rad / s.
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