1. The problem statement, all variables and given/known data A pulley, with a rotational inertia of 1.5✕ 10-3kg·m2 about its axle and a radius of 10 cm, is acted on by a force applied tangentially at its rim. The force magnitude varies in time as F = 0.50t + 0.30t2, where F is in newtons and t in seconds. The pulley is initially at rest. Find angular velocity at t=7s (a) Calculate the torque required to accelerate the Earth in 7 days from rest to its present angular speed about its axis. 2. Relevant equations 3. The attempt at a solution Okay, for the first one, I integrated the Force and got (0.5t^2)/2 + (0.3t^3)/3 = I (alpha) and entered the equation. For the second, I'm found the Moment of Inertia of Earth to be 9.74e37 and tried to find angular velocity by this (2 (pi))/604800 The 604800 is the amount of seconds in 7 days on Earth. Please help and thank you in advance.