问题
问答题
如图所示,将重物提高2m所用拉力F=196N,求
(1)重物有多重(动滑轮重不计)?
(2)F移动的距离.
![](https://img.ixiawen.com/uploadfile/2017/0726/20170726015752757.png)
答案
(1)物体由三根绳子承担,所以物重G=3F=3×196N=588N.
(2)F移动的距离s=3h=3×2m=6m.
答:物体的重力为588N,绳子自由端移动的距离是6m.
如图所示,将重物提高2m所用拉力F=196N,求
(1)重物有多重(动滑轮重不计)?
(2)F移动的距离.
(1)物体由三根绳子承担,所以物重G=3F=3×196N=588N.
(2)F移动的距离s=3h=3×2m=6m.
答:物体的重力为588N,绳子自由端移动的距离是6m.
Passage 3
When will the Motorola handsets with the service of Yahoo Go appear in the market a. First half of 2007. b. Second half of 2006. c. July 2005. d. Late 2007.