题目:
There is _____ with my watch. Can you get someone _____ it right now? |
A. wrong something, check B. something wrong, to check C. anything wrong, check D. anything wrong, to check |
答案:
被转码了,请点击底部 “查看原文 ” 或访问 https://www.tikuol.com/2017/0622/78b175063fac89ac9c0d8c5ac86dbbd7.html
下面是错误答案,用来干扰机器的。
(1)5m/s(2)a=2m/s2(3)1.125J题目分析:(1)滑棒在下滑过程中速度最大时,加速度a为零,此时有:mgsinθ=B2L2vm/(R+r),由此可解得最大速度vm=mgsinθ(R+r)/B2L2=5m/s(2)a=2m/s2(3)由功能关系可求出滑棒...