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?

Question

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

bobpursley · Answer

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.