Question

the radius of the wheel of a bus is 70cm , how many revolution per minute must a wheel make in order to move at a speed of 66 km/ h

Answer 1

Hey dear here is your answer

R=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


Please mark me as brainliest,Thank you and follow me.