Question

A flywheel flows from 250rpm to 150rpm in 4.2 seconds. How many revolutions occur during this time ​

Answer 1

7revolutions

Step-by-step explanation:

Given parameters:

Initial revolution = 250rpm

Final revolution = 150rpm

Time = 4.2s

Unknown:

Number of revolutions that occur at this time = ?

Solution:

To solve this problem;

let us find the change in revolution = 250rpm - 150rpm = 100rpm

Convert the time to seconds;

60s makes 1 minute

4.2s will make
`(4.2)/(60)` = 0.07min

So;

The number of revolutions at this time = 100rpm x 0.07min

= 7revolutions