您所在的当前位置：高中物理试题 >

动量守恒定律

> 在光滑水平面上有一辆平板车，质量分别为m 1、m 2的两人站在车的两端（如图所示），他们以对地速度v 1、v 2相向而行，则在下列三情况下，车的运动方向如何？（1）m 1=m 2,v 1=v 2; (2)m 1≠m 2,v 1=v 2; (3)m 1=m 2,v 1≠v 2.

问题：

发布时间：2024-09-11

在光滑水平面上有一辆平板车，质量分别为m ₁、m ₂的两人站在车的两端（如图所示），他们以对地速度v ₁、v ₂相向而行，则在下列三情况下，车的运动方向如何？

（1）m ₁=m ₂,v ₁=v ₂;
(2)m ₁≠m ₂,v ₁=v ₂;
(3)m ₁=m ₂,v ₁≠v ₂.

参考答案：

提问用户：Hg***bks

可能感兴趣的题目：

1 .Last summer I had ______ in the south of France . A．amusing experience B．a amusing experience C．an amused experience D．an amusing experience
2 手机已从简单的通话工具演变为个人信息智能终端设备。至2012年底,我国手机用户突破11亿。“世界上最遥远的距离,莫过于我们坐在一起,你却在玩手机。”有人因为使用手机成瘾,让手机变成了“手雷”,严重影响身心健康。对此,我们应该　(　　) ①正视手机控制社会的事实 ②适度使用,防止矛盾的转化 ③辩证否定手机功能的拓展 ④创新科技,消除人性的弱点 A．①③ B．①④ C．②③ D．②④
3 与10 0E正好相对的经线是 A.900W B.1700E C.1700W D.1400E
4 Authorities in Shanghai said Thursday night that another person has died from H7N9 bird flu, bringing the death toll to five around the country. The city has reported six infections (感染) to date, and four have died, said the Shanghai Municipal Health and Family Planning Commission. Of the rest two, there was a four-year-old, the agency said. The baby was recovering from mild illness, it added. The person died at Huashan Hospital on Wednesday and was confirmed infected with the H7N9 bird flu on Thursday. Also on Thursday, the commission reported the city"s third death from the H7N9 bird flu. The case involved a 48-year-old man surnamed Chu, a poultry (家禽) transporter from Rugao in neighboring Jiangsu Province. He developed symptoms(症状) of cough on March 28. After having a fever on Monday, he went to a private clinic for treatment. The man then sought help in the Tongji Hospital in Shanghai in the early hours of Wednesday after his condition worsened. Chu died three hours after being admitted to the hospital. He was confirmed infected with the H7N9 virus on Thursday. Eight people who had close contact with him have shown no abnormal symptoms. So far, China has confirmed 14 H7N9 cases -- six in Shanghai, four in Jiangsu, three in Zhejiang and one in Anhui, in the first known human infections of the lesser-known type of bird flu. Of all, four died in Shanghai and one died in Zhejiang. China"s Ministry of Agriculture said Thursday the H7N9 avian flu virus has been detected from pigeon (鸽子) samples collected at a marketplace in Songjiang District of Shanghai. After gene sequence analysis, the national avian flu reference laboratory concluded that the H7N9 virus found on pigeons was highly congenetic with those found on persons infected with H7N9 virus. China"s health authorities have promised transparency(透明) and cooperation (合作) to the World Health Organization in regards to human infections of the new type of bird flu. The Chinese Center for Disease Control and Prevention said Wednesday that no human-to-human transmission of H7N9 has been discovered. 小题1:What does the underlined word “confirmed” probably mean? A．said B．doubted C．proved D．made 小题2:What does the news report mainly about? A．How many people died of H7N9 bird flu B．How the development of the H7N9 bird flu vaccine (疫苗) is going on C．What measures the government has taken to stop the spreading of H7N9 D．The new outbreak of the H7N9 bird flu 小题3:Which of the following statements is NOT true according to the news report? A．H7N9 bird flu has killed four people in Shanghai and one in Zhejiang. B．H7N9 virus is not one that spreads from human to human C．So far, China has confirmed 14 deaths from the H7N9 bird flu D．The government agreed to cooperate with WHO in regards to the H7N9 小题4:What can we infer from the second paragraph? A．Chu, a poultry transporter is the city’s third death from the H7N9 bird flu B．Chu developed symptoms of cough and a fever C．Chu died three hours after being admitted to a private clinic D．Eight people who had close contact with him haven’t been infected with H7N9
5 在昆明市拟建一大型化工厂，下列四幅图中可供选址的是
6 随着经济的快速发展和人民生活水平的日益提高，我国城乡居民住房需求逐渐增加，刺激了房地产市场的发展。但是，拔地而起的一栋栋楼房在满足了人们需要的同时，也耗费了大量的资源、能源。据统计，我国建筑使用能耗占全社会总能耗的比重约为28%。未来一段时间，我国的建筑能耗将持续上升。这说明 [ ] ①建筑行业节能降耗潜力巨大②我国转变经济发展方式的任务比较艰巨③房地产行业应该加强技术创新，低碳生产、绿色生产④国家要重视对低碳技术的研发和推广 A．①②③④ B．①②④ C．②③④ D．①③④
7 多选关于超导现象和半导体，下列说法中正确的是( ) A．处于超导状态的导体，其电阻等于零 B．电流在超导状态的导体中传输，导体不发热 C．半导体的电阻随温度的升高而增大 D．半导体的电阻随温度的升高而减小
8 spending your vacation in a hotel. Why not try hiking in the country? A.Instead of B.Because of C.As a result of D.In spite of
9 有两只标有“220V 40W”、“220V 100W”字样的电灯，串联后接入电压是 440V的电路中，那么 A.两灯的实际电压各为220V，它们能正常发光 B.“220V 40W”的电灯可能会被烧毁 C.“220V 100W”的电灯可能会被烧毁 D.两灯都可能会被烧毁
10 It was the second time that the show__________in the good place. A．was B．has been C．had been D．am

在光滑水平面上有一辆平板车，质量分别为m 1、m 2的两人站在车的两端（如图所示），他们以对地速度v 1、v 2相向而行，则在下列三情况下，车的运动方向如何？ （1）m 1=m 2,v 1=v 2; (2)m 1≠m 2,v 1=v 2; (3)m 1=m 2,v 1≠v 2.

可能感兴趣的题目：