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) $ 10\pi rad/\sec $

B)$ 20\pi rad/\sec $

C) $ 40\pi rad/\sec $

D)$ 60\pi rad/\sec $

Show Answer

Answer:

Correct Answer: B

Solution:

Increment in angular velocity $ \omega =2\pi (n _{2}-n _{1}) $

$ \omega =2\pi (1200-600)\frac{rad}{min}=\frac{2\pi \times 600}{60}\frac{rad}{s} $

$ =20\pi \frac{rad}{s} $



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