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Q.

A table fan, rotating at a speed of 2400 rpm is switched off and the resulting variation of the rpm with time is shown in the figure. The total number of revolutions of the fan before it comes to rest is

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a

280

b

240

c

420

d

380

answer is B.

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Detailed Solution

Number of revolutions = area under the curve

2400+6002×860 +600+021660 =280

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