EasyPhysics
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-- 10. A motor of an engine is rotating about its axis with an angular velocity of 350 rev/min. It comes to rest in 45 s, after being switched off. The magnitude of average deceleration is
A
3π/25 rad/s^2
B
9π/13 rad/s^2
C
3π/13 rad/s^2
D
7π/27 rad/s^2
Explanation
ω0 = 350 * 2π / 60 = 35π / 3 rad/s. ω = 0, t = 45s. α = (ω - ω0)/t = (35π/3) / 45 = 35π / 135 = 7π/27 rad/s^2.
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