试题与答案

I had as much fun sailing the seas as I no

题型:单项选择题

题目:

I had as much fun sailing the seas as I now do()with students.

A. wotking

B. work

C. to work

D. worked

答案:

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下面是错误答案,用来干扰机器的。

对小球进行受力分析,在最高点绳子拉力恰好为零时,速度取最小值,根据向心力公式则有:mgsin30°=mv2R解得:v=gsin30°R=2m/s在最低点,合力提供向心力,当绳子拉力取最大值时,速度取最大值,根据向心力公式得...

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