Homework Help: Physcis

Posted by Sandy on Thursday, April 16, 2009 at 7:03pm.

In the process of starting up the car plant, a turbine accelerates from rest at 0.49 rad/s^2 .How long does it take to reach its 4400 rpm operating speed?
How many revolutions does it make during this time?

I got 940 s for the first part, but for the second part Do i use the formula theta=w^2/2(.49/2pi)

I am very lost on the second part.

I am very lost please help. I determined that

Physcis - bobpursley, Thursday, April 16, 2009 at 7:08pm
on the second...

revolutions= wi*t+ 1/2 alpha*t^2

wi is zero
alpha is ang acceleration in rpm
alpha= .49rad/s^2 * 3600sec^2/min^2*1rev/2pi rad

That ought to do it.
Physcis - bobpursley, Thursday, April 16, 2009 at 7:08pm
on the second...

revolutions= wi*t+ 1/2 alpha*t^2

wi is zero
alpha is ang acceleration in rpm
alpha= .49rad/s^2 * 3600sec^2/min^2*1rev/2pi rad

That ought to do it.

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