Kinematics Question 551

Question: A fan is making 600 revolutions per minute.If after some time it makes 1200 revolutions per minute, then increase in it’s angular velocity is[BHU 1999]

Options:

A) 10πrad/sec

B)20πrad/sec

C) 40πrad/sec

D)60πrad/sec

Show Answer

Answer:

Correct Answer: B

Solution:

Increment in angular velocity ω=2π(n2n1)

ω=2π(1200600)radmin=2π×60060rads

=20πrads



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