1. The problem statement, all variables and given/known data (Actually, this is not a homework, but a project I'm trying to accomplish but I have almost forgotten physics...) There is a disk weighting 100kg with a radius of 0.6 meters. What would be the torque needed to accelerate the disk from 0 rpm to 6 rpm in 10 seconds? Variables: m=100 kg r=0.6 meters rpmA=0 rpm rpmB=6 rpm t=10 seconds 2. Relevant equations If I'm not wrong: The mass moment of inertia of a disk with a uniform mass is considered to be: (m*r^2)/2 where m=mass, r= radius Converting rpm to radians/sec: rad/s = rpm * (pi/30) where pi = 3.14159... 3. The attempt at a solution So, trying to solve the problem: moment of inertia of the disk I = (m*r^2)/2 = (100*0.6^2)/2 = 18 Average angular velocity in radians per second v = (rpmB-rpmA) * (pi/30) = 0.628319 Angular acceleration in rad/s^2 a = Angular velocity in radians per sec /t sec = v/t = 0.0628319 Torque T = Angular acceleration * Moment of Inertia = a*I = 1.13097 Is this correct? Is the above result of Torque in Kg-m? What exactly is the unit of the above inertia result? Is it Kg-m^2 ? Any help will be appreciated!