c*w
发帖数: 4736 | 1 Oops, it looks like no one really worked this problem out.
Maybe it is a little bit tricky.
The key to this problem is the the conservation of angular
momentum. Since to any axis lying on the surface of the turn
table (which does NOT turn with the turntable), the total
angular momentum of the ball conserves, because no torque
exerts on the ball.
Set lab coordinate x-y, which lies on the surface of the
turntable, and whose center is the center of the turntable.
(NOTE, it does not turn with the tu |
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