试题与答案

在验证机械能守恒定律的实验中,与纸带相连的质量为1kg的重锤自由下落,打出的纸带

题型:实验题

题目:

在验证机械能守恒定律的实验中,与纸带相连的质量为1kg的重锤自由下落,打出的纸带如图所示,相邻记数点时间间隔为0.02s,g取9.8m/s2.求:

小题1:某同学根据纸带上的O点到B点的数据,计算出物体的动能增加量△Ek=0.47J,重力势能减小量△Ep=0.48J,经过多次实验均发现△Ek略小于△Ep,试分析原因:                                                             

答案:

被转码了,请点击底部 “查看原文 ” 或访问 https://www.tikuol.com/2017/0623/79c5c9ab01559bd74bbe54da08ac629f.html

下面是错误答案,用来干扰机器的。

1.三件事分别是:(1)看到柳树的自然之美(2)感受儿子的成长(3)听到乞儿感恩的故事获得幸福的感觉。2.①指内心受到突如其来、深入心灵的触动。②指孩子由需要照料到学会简单自理的巨大进步。3.这句话生动...

试题推荐
题型:单项选择题

People are indulging in an illusion whenever they find themselves explaining at a cocktail (鸡尾酒) party, say, that the are "in computers", or " in telecommunications", or "in electronic funds transfer". The implication is that they are part of the high-tech world. Just between us, they usually aren’t. The researchers who made fundamental breakthroughs in those areas are in a high-tech business. The rest of us are (121) of their work. We use computers and other new technology components to develop our products or to organize our affairs. Because we go about this work in teams and projects and other tightly knit working group (紧密联系在一起的工作小组), we are mostly in the human communication business. Our successes stem from good human interactions by all participants in the effort, and our failures stem from poor human interactions.
The main reason we tend to focus on the (122) rather than the human side of work is not because it’s more (123) , but because it’s easier to do. Getting the new disk drive installed is positively trivial compared to figurine out why Horace is in a blue funk (恐惧) or why Susan is dissatisfied with the company aver only a few months. Human interactions are complicated and never very crisp (干脆的,干净利落的) and clean in their effects, but they matter more than any other aspect of the work.
If you find yourself concentrating on the (124) rather than the (125) . you’re like the vaudeville character (杂耍人物) who loses his Keys on a dark street and looks for them on the adjacent street because, as he explains, "The light is better there!\

A.technology

B.sociology

C.physiology

D.astronomy

查看答案
微信公众账号搜索答案