A fan is running at 3000rpm . It is switched off. It comes to rest by uniformly decreasing its angular spead uniformly in 10 seconds. The total number of revolution in this period.
A
150
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B
250
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C
350
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D
300
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Solution
The correct option is C250 ω0=3000rad/minω0=300060rad/sec=50,t=10secωf=0,ωf=ω0+αt
θ=50−α(10)α=5vad/sec2θ=ω0t+12αt2θ=50×10+12×−10×102θ=500−250=250revolution Option B is correct