Question

For model 5, the tip of the blade travels 0.18 mile per revolution. What is the approximate speed, in revolutions per minute, for model 5?

Answer 1

19 revolutions per minute, for model 5.

Explanation:

Consider the model shown below:

From the table:

The blade length for model 5 is 148 feet

Also the maximum blade tip speed is 200 miles per hour.

It is given that the tip of the blade travels 0.18 mile per revolution.

To find the number of revolution per hour simply divide the maximum speed of the blade with the revolution.

Number of revolutions per hour =
`(200)/(0.18)=1111.111`

We need to find the speed, in revolutions per minute, so divide the obtained revolution per hour with 60.

`(1111.11)/(60) =18.52\approx19`

Hence, 19 revolutions per minute, for model 5.