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A student sits on a freely rotating stool holding two dumbbells, each of mass 3.07 kg (see figure below). When his arms
Posted: Wed Apr 27, 2022 7:46 am
by answerhappygod
- A Student Sits On A Freely Rotating Stool Holding Two Dumbbells Each Of Mass 3 07 Kg See Figure Below When His Arms 1 (76.02 KiB) Viewed 58 times
A student sits on a freely rotating stool holding two dumbbells, each of mass 3.07 kg (see figure below). When his arms ar extended horizontally (Figure a), the dumbbells are 1.04 m from the axis of rotation and the student rotates with an angular speed of 0.741 rad/s. The moment of inertia of the student plus stool is 2.56 kg .m2 and is assumed to be constant. The student pulls the dumbbells inward horizontally to a position 0.305 m from the rotation axis (Figure b). w; b (a) Find the new angular speed of the student. rad/s (b) Find the kinetic energy of the rotating system before and after he pulls the dumbbells inward. Kbefore = J Kafter J