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Q.

The speed of a motor increases from 1200 rpm to 1800 rpm in 20s. How many revolutions does it make in this period of time

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a

200

b

400

c

500

d

800

answer is C.

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Detailed Solution

ω1=2π×120060=40π 

ω2=2π×180060=60π

α=ω2−ω1t

=60π−40π20=π

θ=ω1t+12αt2

2πn=40π×20+12×π×20×20

n=500

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