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3.2 , motion in plane — Physics STD 11 Science — Question

Rajasthan BoardEnglish MediumSTD 11 SciencePhysics3.2 , motion in plane1 Mark
MCQ
A body performing unifom circular motion completed $140$ revolution in a second. Its angular speed is .......... $rad / s$
  • ✓
    $880$
  • B
    $440$
  • C
    $220$
  • D
    $240$
✓

Answer

Correct option: A.
$880$
a
(a)

$f=140 red / sec$

$\omega=2 \pi F \rightarrow$ frequency

$\downarrow$

angular speed

$\omega=2 \pi x 140$.

$\omega=280 \times 3.14=879.8 rad / s$

$\omega \simeq 880 rad / s$

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