Torque and inertia question

1. Dec 3, 2005

faculaganymede

A thin uniform rod of mass M and length L is positioned vertically above an anchored frictionless pivot point and then allowed to fall to the ground. With what speed does the free end of the rod strike the ground?

2. Dec 3, 2005

andrewchang

the gpe is being transformed into KE rotational. you would use the height as L/2 since the center of mass is changing that much distance.
the moment of inertia of a stick rotating about the end is 1/3mL^2

$$mg(0.5L) = 0.5I\omega^2$$

3. Dec 4, 2005

marlon

You should not have posted this here. Did you not read this thread ?

regards
marlon

4. Dec 5, 2005

faculaganymede

sorry, that was my first post. didn't know better.

5. Dec 5, 2005

faculaganymede

Thanks Andrew!!