Hi people.(adsbygoogle = window.adsbygoogle || []).push({});

I wonder if anyone could check a problem I had been set as homework and [possibly point me in the right direction for the second part.

A solid disc flywheel, mass 900kg, 0.75m radius accelerated at 0.8rads/s(sq) from rest to 480 RPM in 63 secs.

a) Calculate the number of revolutions during the acceleration period.

I tried it like this:

used the formula theta = w.t + 1/2.alpha.t(sq)

then once i got the answer in radians divide it all by 2pi to get the revolutions. Is that correct? (252 revs)

on a previous question I calculated the torque to be 202 Nm

This next question is causing me some real problems, if anyone could point me in the right direction i would be gratefull.

d) if 20% of the enery is used during a press operation calculate the reduction in speed (RPM) of the flywheel.

Thanks

Tom

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# Help with Flywheel problem.

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