How far has the disk moved? Disk has .34m radius with a mass of 7.4. The angular acceleration about the center of mass is 100.2 rad/s2. So this is what i did: ang. disp= .5(ang. accel)*t^2 (x=.5(a)t^2 =>pretty much) I got my ang. disp to be 84.669 rad. Now i need to convert it to meters. The circum. of the circle i got was 2.136 (2(pi)r= 2*3.1415*.34). so thats how far it goes in 1 revolution. So i do 84.669rad* (1 rev/(2(pi) rad) * (2.136 m/ 1 rev)..... so (84.669*2.136) / (2(pi)) I got the answer to be 28.78 m...and when i checked it was wrong...no idea where i went wrong Also the 2nd part of the question asks what is the translational speed of the disk... i have no idea what translational speed is or means. please help!!