The radius of the wheel of a vehicle is 42 cm. How many revolutions wi

1.	The radius of the wheel of a vehicle is 42 cm. How many revolutions will it complete in a 19.8-km-long journey?
Answer» Radius of the wheel = r = 42 cm (given) Circumference of wheel = Circumference of circle = 2πr = 2 x 22/7 x 42 = 264 Circumference of wheel is 264 cm. Again, distance travelled by wheel = 19.8 km = 1980000 cm (Convert km into cm) Now, number of revolutions taken by a wheel = 1980000/264 = 7500

The radius of the wheel of a vehicle is 42 cm. How many revolutions will it complete in a 19.8-km-long journey?

Answer»

Radius of the wheel = r = 42 cm (given)

Circumference of wheel = Circumference of circle = 2πr = 2 x 22/7 x 42

= 264

Circumference of wheel is 264 cm.

Again, distance travelled by wheel = 19.8 km = 1980000 cm

(Convert km into cm)

Now, number of revolutions taken by a wheel = 1980000/264 = 7500