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March 30, 2015

March 30, 2015

Posted by **Jessica** on Tuesday, November 27, 2012 at 10:59pm.

(a) Find the new angular speed of the student. (rad/s)

(b) Find the kinetic energy of the student before and after the objects are pulled in.

-before(J)

-after(J)

- Physics -
**Jennifer**, Wednesday, November 28, 2012 at 2:30pmUse conservation of momentum

Initial momentum:

The momentum of inertia of the objects the students is m*r^2

(3.0 + 3.4*1^2 + 3.4*1^2)*wi = (3.0 + 3.4*.45^2 + 3.4*.45^2)*wf

where wi = 0.75 is the initial angular momentum, and wf is the final angular momentum. Solve for wf

b) Kinetic energy = 1/2*I*w^2

Initial kinetic energy is

(3.0 + 3.4*1^2 + 3.4*1^2)*wi^2

Final kinetic energy is

(3.0 + 3.4*.45^2 + 3.4*.45^2)*wf^2

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