Physics
Grade-10
Easy

Question

A boy moves a tied stone above his head in circles, time period of circular motion is 2 sec and it forms a circle of 20 cm radius. What is the speed of rotation?

  1. 0.5 m/s
  2. 0.6 m/s
  3. 0.7 m/s
  4. 0.8 m/s

hintHint:

Deriving formula of Speed, v = fraction numerator 2 pi r over denominator T end fraction

The correct answer is: 0.7 m/s


    Time period, T = 2s
    Radius, r = 20cm = 0.20m
    Speed, v = fraction numerator 2 pi r over denominator T end fraction
    equals fraction numerator 2 cross times 3.14 cross times 0.20 over denominator 2 end fraction
    = 0.728 m/s
    Hence choice 3 is correct.

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