题干

一圆盘可以绕其竖直轴在水平面内转动,圆盘半径为R,甲、乙两物体的质量分别为M与m(M>m),它们与圆盘之间的最大静摩擦力均为正压力的μ倍,两物体用一根长为L(L<R)的轻绳连在一起,如图所示,若将甲物体放在转轴的位置上,甲、乙之间轻绳刚好沿半径方向拉直,要使两物体与转盘之间不发生相对滑动,则转盘旋转的角速度最大值不得超过(       )

A:

B:

C:

D:

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D

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                                                                                     Welcome to my blog

Stephen Williams   Friday, June 21

      Today I went to the beach. It was my first day at the ocean for many years. The sound and smell of the ocean brought back memories of the great family vacations when I was a child. We always went to the beach for a week in the summer. I remembered playing for hours in the sand with my sister and crying when I couldn't have any ice cream. Oh, and I remembered finding a huge jellyfish on the beach, and running away because I was scared! Amazing, really, the things you remember from your childhood...

Comments

    Yeah, I remember going for long walks in the countryside. I guess I was only eight or nine. In the winter, my mom made soup, and I can still remember the wonderful smell! When we got home, I always went straight to sleep...

Carla, Mexico

    What a great story! I remember going to the beach, too – on Christmas Day! My family lived in Australia when I was young. I remember waking up early. After we opened our presents, we always went to the beach and had a barbecue.

Leung, Hong Kong

    The best memory I have is playing my first video game, Super Mario. I remember thinking that it was amazing, It was my tenth birthday and I still remember opening the box.

Daisuke, Japan