a fan is rotating at 180 rpm.it is then switched off.it stops after 21 revolutions.calculate the time taken by it to stops
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Answer:
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Explanation:
In this case, the initial angular velocity of the fan is ω
0
=0 and the final angular velocity of the fan is ω=100rev/sec.
The total number of revolutions before the fan coming to stop is calculated as follows.
θ=(
2
ω+ω
0
)t=(
2
100+0
)×(5×60)=15,000rev
Hence, the total number of revolution made before it stops is 15,000rev.
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