题目内容
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A small ball with mass m initially is at point A as shown in the figure, then it slides down along the smooth circular track ADCB of radius r, what are the angular velocity when the small ball reaches point C and its force on the circular track？
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Fifth Avenue is the place 查看材料
A.do whatever they like for relaxation
B.where you can play all kinds of ball games
C.than the world famous Broadway
D.enjoy the colorful night life of the city
E.where the wealthy people would go shopping
F.for what seems to be a very small sum today
听力原文：Woman: All right, now. Before you step up to the tee, take one practice swing.
Man: I know. And keep my eye on the ball. I remember everything you've told me.
Woman: Good. And don't throw your club. That won't help matters at all. If you miss the ball, just stay calm and try again. You don't want to lose your concentration, so it's really important to stay calm.
Man: All right, all right. I get it. Will you be quiet now so I can try hitting the ball？
Where are the speakers？
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