Question

the wheels of a car are of diameter 80cm each.how many complete revolutions does each wheel make in 10 min when the car is travelling at a speed of 66km per hour​

Answer 1

First, Convert 66 kmph into m/s i.e 66*1000/3600 = 66*5/18= 55/3 m/s.

Now, Distance covered in 10 min = (55/3*10*60)m = 11,000 m.

Circumference of wheel= (22/7*80/100 )m , which is distance covered in one Revolution.

No. of complete Revolution = 11000/(22/7*80/100 ) = 4,375.