Afly wheel is making 180 rev/min and after 20s,its running at 120 rev/min.how many rev will it make and what time would ellapse before it stops. If the retartation is uniform
Please name the School Subject PHYSICS, because that's what these look like?
Sra
To determine the number of revolutions the flywheel will make before it stops and the time it will take, we need to calculate the deceleration rate.
First, let's find the change in rev/min over time:
Δrev/min = final rev/min - initial rev/min
= 120 rev/min - 180 rev/min
= -60 rev/min
Next, let's calculate the deceleration rate (retardation):
Deceleration rate = Δrev/min / time
= -60 rev/min / 20 s
= -3 rev/min/s (negative sign indicates deceleration)
To find the time it takes for the flywheel to stop, we can divide the final rev/min by the deceleration rate:
Stopping time = final rev/min / deceleration rate
= 120 rev/min / 3 rev/min/s
= 40 s
Finally, to calculate the number of revolutions before it stops, we multiply the stopping time by the initial rev/min:
Revolutions before stopping = initial rev/min * stopping time
= 180 rev/min * 40 s
= 7200 rev
Therefore, the flywheel will make 7200 revolutions, and it will take 40 seconds for it to stop.