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Physics problems: conservation laws

Conservation of angular momentum

 

Problem 5.

A small body of mass is attached to a light thread which passes through a hole at the centre of a smooth table. The body is set into rotation in a circle of radius , with a speed of . The thread is then pulled down shortening the radius of the path to . What will the new linear speed and the new angular speed be?

Solution

 

Problem 15.

A particle of mass m moving in a circular orbit of radius r has angular momentum j about its center. Calculate kinetic energy in terms of j, m and r.

Solution

 

 

 

 

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