Question

a car runs at the speed of 66 km per hour each wheel makes 400 Revolution per minute find the radius of the wheel of the car in centimetres

Answer 1

Answer:

Step-by-step explanation:

In one hour the wheel covers 66 km.

In one minute the wheel makes 400 revolutions.

If it covers 66km in 1 hr how many kilometers will it cover in 1 minute.

Distance covered in one minute is :

66/60 = 1.1 km

It makes 400 revolutions to cover 1.1 km

One revolution = 1.1/400 =0.00275km

The formulae for getting the circumference :

Circumference = 22/7 × 2r

= 44/7r

0.00275 = 44/7r

r = 7/44 × 0.00275 = 0.0004375Km

In meters it is :

0.0004375 × 1000 = 0.4375m