Each wheel of a car is making 5 revolutions per second :

Each wheel of a car is making 5 revolutions per second. If the diameter of a wheel is 84 cm, then the speed of the car in cm/sec. would be

  1. 264 cm/sec
  2. 1320 cm/sec
  3. 1000 cm/sec
  4. 420 cm/sec
Anurag Mishra Professor Asked on 27th December 2015 in Maths.
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  • 1 Answer(s)

    Answer:  (2) 1320 cm/sec

    Explanation:-
    The diameter of a wheel = 84 cm 
    Then, the radius of the wheel = 84/2
     = 42 cm 

    The perimeter of the wheel = 2 x 22 x 42/7
     = 44 x 6
     = 264 

    Then, distance covered by a car in a revolution = 264 cm 
    Therefore,  distance covered by a car in  5 revolution = 264 x 5 
      = 1320 cm

    Thus, the speed of the car in cm/sec will be 1320 cm/sec. 

    Hence, the correct answer is option (2) 1320 cm/sec. 

    Anurag Mishra Professor Answered on 27th December 2015.
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