Question

The diameter of a wheel is 0.70 m. Find the distance covered by it in 500 revolutions. If the wheel takes 5 minutes to make 500 revolutions; find its speed in : 

(i) m/s 

(ii) km/hr.

Answer 1

Diameter = 0.70 m 

Radius, r = 0.35 m 

Distance covered in 1 revolution, i.e. circumference = 2πr = 2 x 22/7 x 0.35 = 2.20 m 

Distance covered in 500 revolutions = 2.20 x 500 = 1100 m 

Time taken = 5 minutes = 5 x 60 = 300 sec.