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Q.

When a ceiling fan is switched on, it makes 10 revolutions in the first 3 seconds. Assuming a uniform angular acceleration, how many revolutions it will make in the next 3 seconds?

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a

10

b

20

c

40

d

30

answer is C.

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Detailed Solution

θ=12t2

θ1:θ2=1:3 

where θ1 and θ2 are the angle traveled in successive interval of time

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When a ceiling fan is switched on, it makes 10 revolutions in the first 3 seconds. Assuming a uniform angular acceleration, how many revolutions it will make in the next 3 seconds?