alleryStart learning →A fan at 90 rpm stops after 21 turns under constant friction. Time to stop (s)?
Aalong axis, thumb rule
Balong the tangent line
Ctowards circle centre
Dalong radius outwards
Answer & Solution
Correct answer: B. along the tangent line
With ω0 = 3π rad/s and θ = 42π rad, average speed 1.5π gives t = 42π / 1.5π = 28 s.
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