Question

How many revolutions will a circular disk with a diameter of 3 feet have completed after it has rolled 18 feet?

Answer 1

The circumference of a circle is given as:

`C=\pi d`

The diameter of the circular disc is 3 feet'

It follows:

`\begin{gathered} C=3\pi \\ C=9.4 \end{gathered}`

Therefore the number of revolution is:

`(18)/(9.4)=1.9`

Therefore the number of revolution is approximately 2 revolutions