Posted by kelsey on .
Two turtles (each 2 kg) sit on an approximately massless branch in the water. They sit on opposite sides of the branch's center, each 3 m away.
The branch (10 m long) is spinning at 2 rad/s about its center (nearly without friction).
Now, if both turtles walk to the ends of the log, then the new angular speed of the log+turtles system would be:
rad/s
do you use conservation of torque? what can be set equal?

physics help 4 please!! 
drwls,
<<do you use conservation of torque?>>
There is no torque on the branch. Angular momentum about the center of the branch is conserved.
They each move from 3 to 5 m from the center of the branch.
Angular velocity w decreases by a ratio 3/5 to keep the angular momentum constant 
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