1. The problem statement, all variables and given/known data A wheel (M = 8.64 kg, R = radius 0.738 m) in the shape of a disk is rotating at fo = 76.6 rpm when a tool is pressed against the edge of the wheel, slowing it down at a constant rate to ff = 31 rpm in time t = 4.62 seconds. Find: τ, the magnitude of the torque exerted by the tool on the wheel 2. Relevant equations Used the kinematic equations and the um.. torque formula. 3. The attempt at a solution Here is my approach... ω_0 = 76.6 * 2π/60 ω_f = 31 * 2π/60 Then... α = (ω_f - ω_0)/t So I believe I get... τ = Iα = mr²/2 * (ω_f - ω_0)/t = 8.64 * 0.738²/2 * (3.25 - 8.02)/4.62 ≈ -2.43?