A student sits on a rotating stool holding two 3.0 kg objects.When his arms are extended horizontally, the objects are 1.0 m fromthe axis 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 0.20 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.
before _______ J
after _______ J
I am really having trouble with the setup of this problem andhaven't been able to calculate the right answer. I need helpfiguring out how I should approach this. It would really help tosee the problem worked out to have something to compare my workwith so I can see where I'm making my mistakes. Thank you!
A student sits on a rotating stool holding two 3.0 kg objects.When his arms are extended horizontally, the objects are 1.0 m fromthe axis 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 0.20 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.
before _______ J
after _______ J
I am really having trouble with the setup of this problem andhaven't been able to calculate the right answer. I need helpfiguring out how I should approach this. It would really help tosee the problem worked out to have something to compare my workwith so I can see where I'm making my mistakes. Thank you!
