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

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

VITEEEVITEEE 2013

Solution:

Total number of revolutions $=$ area under $n-t$ graph
$=\frac{1}{2} \times 8 \times \frac{1800}{60}+8 \times \frac{600}{60}+\frac{1}{2} \times 16 \times \frac{600}{60}$
$=120+80+80=280$