Question

If the radius of the wheel of a bus is 70 cm and its speed is 66 kmph, then the rpm (revolutions per minute) of the wheel will be​

Answer 1

Step-by-step explanation:

Question:

If the radius of the wheel of a bus is 70 cm and its speed is 66 kmph, then the rpm (revolutions per minute) of the wheel will be ?

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Radius = 70cm

circumference = 2 * 22/7 * 70

                     = 440 sq.cm

                      = 0.0044 km

speed * time = distance

distance = 66 * 1/60     ( 1min = 1/60 hr )

              = 1.1 km

No. of revolutions = distance / circumference

                            = 1.1 / 0.0044

  = 250 revolutions / minute Ans

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