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23 Nov 2019
A student sits on a rotating stool holding two 2.0 kg objects. Whenhis arms are extended horizontally, the objects are 1.0 m from theaxis of rotation, and he rotates with an angular speed of 0.75rad/s. The moment of inertia of the student plus stool is 3.0 kg·m2and is assumed to be constant. The student then pulls the objectshorizontally to 0.40 m from the rotation axis.
(a) Find the new angular speed of the student.
rad/s
(b) Find the kinetic energy of the student system before and afterthe objects are pulled in.
A student sits on a rotating stool holding two 2.0 kg objects. Whenhis arms are extended horizontally, the objects are 1.0 m from theaxis of rotation, and he rotates with an angular speed of 0.75rad/s. The moment of inertia of the student plus stool is 3.0 kg·m2and is assumed to be constant. The student then pulls the objectshorizontally to 0.40 m from the rotation axis.
(a) Find the new angular speed of the student.
rad/s
(b) Find the kinetic energy of the student system before and afterthe objects are pulled in.
