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NEET
Exam
NEET
Subject
Physics
Chapter
Rotational Motion

NEET · Physics · Rotational Motion

A table fan rotating at a speed of 2400 rpm is switched off and the...

A table fan rotating at a speed of 2400rpm2400 \mathrm{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 A table fan rotating at a speed of 2400 rpm is switched off and the resulting variation of revolution/minute with time

Options

  1. A160
  2. B280
  3. C380
  4. D420

Correct answer

B. 280

Step-by-step solution

Total number of revolutions = area under n−t graph =12×8×180060+8×60060+12×16×60060=120+80+80=280\begin{array}{l} \mathrm{n}-\mathrm{t} \text{ 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 \end{array}
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