Question

The radius of the front wheel of Paul's bike is 63cm. Paul goes for a cycle and travels 69.89km. How many full revolutions did Paul's front wheel complete?

Answer 1

Answer:
`17,649`

Explanation:

Given

The radius of the cycle is
`r=63\ cm`

Distance traveled by Paul is
`68.89\ km`

Distance traveled by one complete revolution of wheel is equivalent to circumference of wheel i.e.

`\Rightarrow 2\pi r\\\\\Rightarrow 2* (22)/(7)* 63\\\\\Rightarrow 396\ cm\ \text{or}\ \text{3.96}\ m`

No of revolution made by wheel

`\Rightarrow n=(69.89* 1000)/(3.96)\\\\\Rightarrow n=17,648.9899\approx 17,649`