wilkinsonei1256 wilkinsonei1256

13-12-2022
Physics

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an electric sander consisting of a rotating disk of mass 0.3 kg and radius 14 cm rotates at 20 rev/sec. when applied to a rough wooden wall, the rotation rate decreases by 21%. (a) what is the final rotational kinetic energy of the rotating disk (in j)? j (b) how much has its rotational kinetic energy decreased (in j)?

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