您所在的当前位置：高中物理试题 >

冲量

> 质量为1kg的物体做变速直线运动，它的速度—时间图像如图所示，则该物体在20s内所受合外力的功和冲量的大小分别是（） A．10J，10N·s B．25J，—10N·s C．0J，10N·s D．0J，—10N·s

问题：

发布时间：2020-03-13

质量为1kg的物体做变速直线运动，它的速度—时间图像如图所示，则该物体在20s内所受合外力的功和冲量的大小分别是（）

A．10J，10N·s

B．25J，—10N·s

C．0J，10N·s

D．0J，—10N·s

参考答案：

提问用户：d8***5K4

可能感兴趣的题目：

1 Please do me a favor-_____ my friend Mr. Smith to Youth Theater at 7:30 tonight. [ ] A. to invite B. inviting C. invited D. invite
2 为调查某市中学生平均每人每天参加体育锻炼时间X（单位：分钟），按锻炼时间分下列四种情况统计：①0～10分钟；②11～20分钟；③21～30分钟；④30分钟以上，有10000名中学生参加了此项活动，如图是此次调查中某一项的流程图，若平均每天参加体育锻炼的时间在0～20分钟的学生的频率是0.15，则输出的结果为______．
3 下列湿地，分布在高纬度地区的是 A.湖泊湿地 B.沼泽湿地 C.河流湿地 D.海岸湿地
4 卡文迪什通过实验研究得出万有引力恒量的实验装置示意图是图______________；库仑通过实验研究得出电荷之间相互作用力规律的实验装置示意图是图______________。
5 甲、乙两相邻的化工厂，排放的污水经处理后，仍然各溶有以下八种离子（Ag +、Fe 3+、Ba 2+、Na +、Cl -、SO 4 2-、NO 3 -、OH -）中各不相同的4种，若单独排放，则造成环境污染，如果将甲、乙两厂的污水按适当比例充分混合，再经沉淀后，排放的污水转变为无色澄清的NaNO 3溶液，污染程度大为降低，又经测定，甲厂污水的pH大于7，试推断：（l）甲厂中含有的离子：______；（2）乙厂中含有的离子是______．
6 阅读理解。 Edmund Halley was an English scientist who lived over 200years ago. He studied the observations of comets which other scientists had made. The orbit of one particular comet was a very difficult mathematical problem. He could not figure it out. Neither could other scientists who dealt with such problems. However, Halley had a friend named Isaac Newton. Who was a brilliant mathematician. Newton thought he had already which he had done it. He told Halley that the orbit of a comet had the shape of an ellipse. Now Halley set to work. He figured out the orbits of some of the comets that had been observed by scientist. He made a surprising discovery. The comets that had appeared in the years 1531, 1607 and 1682 all had the same orbit. Yet their appearances had been 75 to 76 years apart. This seemed very strange to Halley. Three different comets followed the same orbit. The more Halley thought about it, the more he thought that there had not been three different comets, as people thought. He decided that they had simply seen the same comet three times. The comet had gone away and had come back again. It was an astonishing idea! Halley felt certain enough to make a prediction of what would happen in the future. He decided t hat this comet would appear in the year 1758. There were 53 years to go before Halley"s prediction could be tested. In 1758 the com et appeared in the sky. Halley did not see it, for he had died some years before. Ever since then that comet been called Halley"s comet, in his honor. 1. Halley made his discovery _____. A. by doing experiments B. by means of his own careful observation C. by using the work of other scientists D. by chance 2. Halley made a surprising but correct prediction in the year _____. A.1704 B.1705 C. 1706 D.1707 3. This text in general is about _____. A. Halley and other scientists B. the orbit of a comet C. Newton and Halley D. Halley and Halley 4. Which of the following is TRUE? A. Edmund Halley was an American scientist B. Halley made his discovery by doing experiments. C. Isaac Newton was a famous mathematician. D. The orbit of a comet had the shape of an around.
7 ____ the tower building,where you see the whole city. [ ] A. Standing on the top of B .If you climb to C. When you reach the top of D. Get to the top of
8 Too much drinking will do________to your health；you should take the doctor’s advice. A．harm B． trouble C．damage D．hurt
9 下列关于西部地区的叙述不正确的是 A.西部地区的省、市、区数量为我国多一点，但面积却接近国土的一半 B.西部地区发展经济的优势是面积广大，资源丰富 C.我国的水能资源70%以上集中在西南地区 D.我国的风能资源大多集中在西北地区
10 在科学发展史上，不少物理学家作出了重大贡献。下列陈述中不符合历史事实的是（） A．伽利略对自由落体的研究，开创了研究自然规律的科学方法 B．密立根最早通过实验，比较准确的测定了电子的电量 C．牛顿发现了万有引力定律并测出了万有引力常量 D．库仑总结并确认了真空中两个静止点电荷之间的相互作用规律

质量为1kg的物体做变速直线运动，它的速度—时间图像如图所示，则该物体在20s内所受合外力的功和冲量的大小分别是（ ） A．10J，10N·s B．25J，—10N·s C．0J，10N·s D．0J，—10N·s

可能感兴趣的题目：

质量为1kg的物体做变速直线运动，它的速度—时间图像如图所示，则该物体在20s内所受合外力的功和冲量的大小分别是（）

A．10J，10N·s

B．25J，—10N·s

C．0J，10N·s

D．0J，—10N·s