Physics (angular motion)
posted by George on .
The blades of a fan running at low speed turn at 230rpm . When the fan is switched to high speed, the rotation rate increases uniformly to 370rpm in 5.80s .
What is the magnitude of the angular acceleration of the blades?
How many revolutions do the blades go through while the fan is accelerating?
for here, you have to choose your units. I think I would change time to minutes, so angular acceleration would be in rev/min^2
= 140*60/5.8 work that our rpm^2
= 230*5.8/60 + 1/2 above acc*(5.8/60)^2
or you could have done it with avg velocity
rev=avgvelocity*time=(wf+wi)/2 * 5.8/60