Question

The wheels of a car of diameter 70 cm are. Making 550 revolutions per minute. Find the speed per hour.

Answer 1

Answer:

diameter =70 cm ; radius=35 cm

one revolution=2πr

=2*22*35/7=220 cm so,

per minute the tyre travels distance

=550*220 cm ;=1210 cm

speed=distance/time

1210 cm/(60*60)

121 meter/3600 second