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 .
Part A
What is the magnitude of the angular acceleration of the blades?
Part B
How many revolutions do the blades go through while the fan is accelerating?

angular acceleration=(wfwi)/time
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
acceleration= (370230)/(5.8/60)
= 140*60/5.8 work that our rpm^2
rev=wi*time+1/2 acceleration*time^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