ceiling fan is rotating at 086 revs When tumed off, it slows uniformly to a stop

Question

ceiling fan is rotating at 086 revs When tumed off, it slows uniformly to a stop in 2.8 min ow many revolutions does the fan make in this time? )3068 rev B) 50 45 rev C)72.24 Tey D) 8238 rev E)92.52 rev F) 101.7 rev 24. What is the fan's angular acceleration in revis? A, 1004-10, revis, B) 26s-10" rew c) 3.89×10'revisi D)468.10, revis, E) 5.12-10, rev 25. How many revolutions must the fan make for its speed to decrcase from 0.86 rev/s to 0.48 rev/s A) 17.9 rev B)248 rev C) 36.2 rev D) 49.7 rev E) 53.6 rev F) 67.1 re

Explanation / Answer

Rate = 0.86 rev/s

t = 2.8 min = 2.8*60 = 168 s

revs = Rate*t = 0.86*168 = 144.48 = 144 revolutions

Rate = 1/2*(Final rate + initial Rate) = (144 + 0) /2= 72 revs.

choose B

Q24

angular acceleration:

accelartion = dRate/dt = (0.86-0)/(2.8*60) = 0.00511 rev/s/s

choose E

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