1. The problem statement, all variables and given/known data A fan blade is rotating with a constant angular acceleration of +12.0 rad/s2. At what point on the blade, as measured from the axis of rotation, does the magnitude of the tangential acceleration equal that of the acceleration due to gravity? 2. Relevant equations aT=(r)([itex]\alpha[/itex]) 3. The attempt at a solution What I did is rearrange the equation so that r=aT/[itex]\alpha[/itex] This gave me r=(9.80m/s^2)/(12.0rad/s^2) So, r=0.0817 m/rad The answer is supposed to be 0.817 m, but why am I getting m/rad? In fact, m/rad doesn't even make sense. Is there another way to rearrange the equation? Any help is much appreciated. Thank you.