Question

Angling for a New Idea Conservation of L A) I Spin while holding two dumbbells close to your body with your arms folded, spin around on the ro- tating chair (be sure your feet are not touching the chair or ground). Next quickly push the dumbbells straight out to arm's length When you moved the dumbbells away from your trunk, was there a net torque applied to the system (you + rotating chair + dumbbells)? Explain whether or not and how this accounts for what you observed, by considering changes in the rotational inertia, I. B) Torqued by Angular Impulse 1) Hold a fast spinning bike wheel with your feet not touching the chair or ground. Vith the wheel spinning fast and the axis of rotation vertical, quickly turn it end-over-end once while sitting on an initially stationary stool. Consider you and the stool together to be one part and the bike wheel to be a second part of one physical system. Is the torque you exert on the bike wheel an external or internal torque? What happens to the angular momentum of the entire physical system? (if you do this quickly, frictional torques exerted by the wheel bearings are not significant). 2) How does the angular momentum of the two individual parts change? Draw angular mo- mentum vectors for the objects of you & stool, the wheel, and the system for the cases of before and after the flip, to explain what you observed. Conserved + AL L L System 0 Total System

Answer 1

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