- #1
mini670
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Hi people.
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 energy is used during a press operation calculate the reduction in speed (RPM) of the flywheel.
Thanks
Tom
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 energy is used during a press operation calculate the reduction in speed (RPM) of the flywheel.
Thanks
Tom
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