Originally Posted by **man_in_motion** In an example problem the book gives 500 rev/min. It says to solve for the number of revolutions in 5.5s you need to use the formula w=w_o+ \alpha t Why can't one just convert the revolutions into radians/second and multiply that with 5.5s? kind of like x=vt that would be the way to do it by only looking at the units of the solution |

Please post the whole problem. How can the book gives the result in rev/min if it asks a number?

It's hard to understand where you're having problem since as stated, the problem is incomprehensible. Maybe your method works only when the angular acceleration is null and wouldn't work in the case the rotating object has an increasing angular acceleration. Just to be sure, please post the full problem.