Question

4. An electric fan shuts off and its angular velocity decreases uniformly from 500 rev/min to 200 rev/ min in 4.00 seconds. (a)Calculate the angular acceleration, in rad/s^2, assuming that it is constant, in rev/s^2. (b)Calculate the time it takes you to come to a complete stop.

Answer 1

1 rieva a radls W - Soo r/min - Sooxar = 52.3 rad/sec wa 200 rev mina 200x20 = 20.93 Mad/sec OD t = 4 sec wf- We taat 22 wf-wi - 20.93- 52.33 at d = -7.849 rad/sa magnitude dl = 7.849 gradesa who wpawit ad o= Wetat to w = ta - Wi = - 52.3 -7.849 [t= 6.663 sec )