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Answer:
(a)
(b) 4.17 rev
(c) 6.40 sec
Explanation:
We have given the angular velocity of fan decreases from 550 rev/min to 180 rev/min
So initial angular speed
Final angular speed
Time is given as t = 4.3 sec
(a) We know that angular acceleration is given by
(b) We know the relation \Theta =\omega _0t+\frac{1}{2}\alpha t^2=9.166\times 4.3-\frac{1}{2}\times 1.43\times 4.3^2=26.1935rad=\frac{26.1935}{2\pi }=4.17rev
(c) Now final angular velocity
So time
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