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6. system of particles and rotational motion — Physics STD 11 Science — Question

Gujarat BoardEnglish MediumSTD 11 SciencePhysics6. system of particles and rotational motion1 Mark
MCQ
When a ceiling fan is switched on, it makes $10$ rotations in first $3\,seconds,$ How many rotations will it make in the next $3\,seconds.$ (Assume uniform angular acceleration)
  • A
    $10$
  • B
    $20$
  • ✓
    $30$
  • D
    $40$
✓

Answer

Correct option: C.
$30$
c
For constant acceleration

$n_1 : n_2 : n_3 ..... = 1 : 3 : 5 : \,...........$

$\therefore $ if $n_1 = 10$ rotation then $n_2 = 30$ rotation

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