Question

the diameter of the driving wheel of a bus is 140 cm how many revolutions per minute must the will make in order to keep a speed of 66 km per hour

Answer 1

$<b>$Circumference = No.of revolutions * Distance covered

 

Distance to be covered in 1 min. = (66 X1000)/60 m = 1100 m.


Circumference of the wheel = 2 x (22/7) x 0.70 m = 4.4 m.


Number of revolutions per min. =(1100/4.4) = 250.