1. The problem statement, all variables and given/known data Lets say I am tightening a screw and I have multiple torque values with their respective number of revolution. How should I go on about calculating the power required? Also lets assume we know the time it takes to tighten the screw. 2. The attempt at a solution I know Power = T*dθ/dt = Tω = 2*pi*n*T, where T = torque, ω = angular velocity, n = number of revolution/sec Since the torque is not constant I am not sure how to approach this problem. Is there any other information i need in order to calculate the power?