Physics
Grade-10
Easy

Question

Richa is sitting in a merry-go-round.  The time period of circular motion if it forms a circle of 56 m radius. The speed of rotation is 40 m/s.

  1. 2.8 pi s
  2. 280 pi s
  3. 0.14 pi s
  4. 28 pi s

hintHint:

Using formula for time period of uniform circular motion.

The correct answer is: 2.8 pi s


    Speed, v = 40 m/s
    Time period, t = ?
    Radius, r = 56 m
    So, T equals fraction numerator 2 pi r over denominator V end fraction 
    equals fraction numerator 2 cross times pi cross times 56 over denominator 40 end fraction
    equals 2.8 pi space s

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