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A uniform disk of radius 0.9 m and mass 3.2 kg is rotating about its center of mass. Its moment of inertia about its center of mass is I=1/2mR². Its angular velocity as a function of time is given by ω(t)=3kt²/t₁³ where k = 5 rad and t1= 5 s. Find the magnitude of the net torque about the center of mass acting on the disk at t= 7 seconds.

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