Question

A student sits on a freely rotating stool holding two dumbbells, each of mass 2.91 kg (see figure below). When his arms are extended horizontally (Figure a), the dumbbells are 1.08 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 2.80 kg m² and is assumed to be constant. The student pulls the dumbbells inward horizontally to a position 0.304 m from the rotation axis (Figure 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. $K_{before}$ = $K_{after}$ =

          A student sits on a freely rotating stool holding two dumbbells, each of mass 2.91 kg (see figure below). When his arms are extended horizontally (Figure a), the dumbbells are 1.08 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 2.80 kg m² and is assumed to be constant. The student pulls the dumbbells
inward horizontally to a position 0.304 m from the rotation axis (Figure 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.
$K_{before}$ = 
$K_{after}$ =

A student sits on a freely rotating stool holding two dumbbells, each of mass 2.91 kg (see figure below). When his arms are extended horizontally (Figure a), the dumbbells are 1.08 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 2.80 kg m² and is assumed to be constant. The student pulls the dumbbells
inward horizontally to a position 0.304 m from the rotation axis (Figure 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 =
Kafter =

Added by Robin J.

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