A flywheel rotates about a fixed axis and slowsdown from 400 4rpm to 200 rpm in one minute.How many revolutions does the flywheel completein the same time?

To find the number of revolutions the flywheel completes in one minute, we need to calculate the difference in the number of revolutions between the initial and final speeds.

Given:
Initial speed = 400 rpm
Final speed = 200 rpm
Time = 1 minute

The change in speed is given by:
Change in speed = Initial speed - Final speed

Change in speed = 400 rpm - 200 rpm = 200 rpm

Now, we know that revolutions per minute (rpm) is a measure of how many times an object completes a full rotation in one minute.

Therefore, the number of revolutions the flywheel completes in one minute is equal to the change in speed:

Number of revolutions = Change in speed = 200 rpm

So, the flywheel completes 200 revolutions in one minute.

rotation=avgspeed*time= (wi+wf)/2 * time