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Question

An object is moving in a circle of radius 100 m with a constant speed of 31.4 blank m s to the power of negative 1 end exponent. What is its average speed for one complete revolution?

  1. Zero    
  2. 31.4 blank m s to the power of negative 1 end exponent    
  3. 3.14 blank m s to the power of negative 1 end exponent    
  4. square root of 2 cross times 31.4 blank m s to the power of negative 1 end exponent    

The correct answer is: 31.4 blank m s to the power of negative 1 end exponent


    The time taken by the particle for one complete revolution.
    t equals fraction numerator 2 pi r over denominator s p e e d end fraction
    equals fraction numerator 2 cross times 3.14 cross times 100 over denominator 31.4 end fraction equals 20 s
    H e n c e comma blank a v e r g e blank s p e e d blank i s blank
    v subscript a v end subscript equals fraction numerator 2 cross times 3.14 cross times 100 over denominator 20 end fraction equals 31.4 blank m s to the power of negative 1 end exponent

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