您所在的当前位置：高中物理试题 >

动量定理

> 物体静止在水平地面上，对它施加竖直向上的大小为F的恒定拉力，物体离地运动起来，经时间t撤去该拉力，物体又运动了时间3 t时，速度减为零，不计空气阻力，求：（1）物体的质量；（2）物体离开地面的最大高度。

问题：

发布时间：2024-09-10

物体静止在水平地面上，对它施加竖直向上的大小为F的恒定拉力，物体离地运动起来，经时间t撤去该拉力，物体又运动了时间3 t时，速度减为零，不计空气阻力，求：
（1）物体的质量；
（2）物体离开地面的最大高度。

参考答案：

提问用户：FC***Jw3

可能感兴趣的题目：

1 It was the surprising degree of accuracy that the old man predicated with_______ shocked the public. A．how B．that C．who D．which
2 粮食和畜产品出口较多的南半球发达国家是 A　　巴西 B 　美国 C　澳大利亚 D　　阿根廷
3 函数 f(x)=cos(x+ π 4 )-cos(x- π 4 )是（　　） A．周期为π的偶函数 B．周期为2π的偶函数 C．周期为π的奇函数 D．周期为2π的奇函数
4 下图是关于闰年的程序框图，则以下年份是闰年的为（　　） A．1998年 B．1994年 C．2100年 D．1996年
5 我省著名风景区崀山位于 A.张家界 B.邵阳 C.怀化 D.湘潭
6 已知向量，向量，且，则实数等于( ) A ． B ． C ． D ．
7 阅读理解。 Anthony was sad. He was, as he put it, "not very bright" and couldn"t win the attention of his very wealthy parents, who preferred his "clever" older brother. At age 8, Anthony was sent away to a boarding school in his native England, even though he screamed and pleaded with (恳求) his parents year after year not to send him. "The thought was ,it would be good for me," he recalled. It was not. Anthony did badly in his studies, had few friends and was bullied for five years. "My teachers couldn"t have had a lower opinion of me," he said. "I wasn"t even smart enough to rebel. The one thing I remember from the very earliest age was the desire to write. When I was 10 years old, I remember asking my parents to get me a typewriter for my birthday because I wanted to be a writer." Now, at 55, Anthony is one of the world"s most successful children"s book authors. His Alex Rider series has sold more than 5 million copies,and the eighth book featuring the young spy, Crocodile Tears, has come out. The Alex Rider books tell the adventures of 14-year-old Alex Rider, an agent for the British intelligence agency M16. Anthony says he doesn"t try to write for kids; it just comes out that way." I have a feeling that it has something to do with purity and simplicity. I give as little information as is necessary to describe the room, the character in the room, and get on with the action," he said. The style has also made Anthony a successful writer of television shows for adults in Britain because, he says, writing books for kids is a lot like writing television for grown-ups: In both cases, it"s all about entertaining people with a good story. Now, Anthony couldn"t be happier with his life. He sums up his success:"…you can be anything you want to be if you just believe in yourself. I do believe it completely." 1. Which of the following is true of Anthony? A. He was the beloved child of his family. B. Although he is successful, he isn"t very happy. C. He places more emphasis on the characters" behavior in his stories. D. Studying in a boarding school proved a good choice for him. 2. At boarding school , Anthony"s teachers ________. A. often criticized him. B. showed great concern for him. C. encouraged him to be a writer. D. thought little of his ability. 3. What would be the best title for the passage? A. Anthony"s popular books- Alex Rider series B. Alex Rider, a popular character C. Anthony, a successful children"s book author D. Special writing style 4. What advice does Anthony give to readers? A. Confidence is the key to success. B. Hardship teaches valuable lessons. C. Internet is the best teacher. D. Failure is the mother of success.
8 有一列火车正在做匀加速直线运动.从某时刻开始计时，第1分钟内，发现火车前进了240m. 隔了3分钟后再观察2分钟，发现火车前进了1128m.则火车的加速度为（） A．0.01m/s2 B．0.02m/s2 C．0.05m/s2 D．1.2m/s2
9 汽车在下雨或寒冷天气行车时，风档玻璃上往往会积水或积雪，影响驾驶员视野清晰和行车安全．新一代后风窗玻璃可通过玻璃内夹有的电热丝加热除雾、除冰、除霜，立即消除驾驶员的后顾之忧，这主要利用了金属的 A.延展性 B.导电性 C.弹性 D.磁性
10 我国近年来塑料大棚菜田发展迅速，主要得益于 ①雨热同期的气候 ② 平原为主的地形 ③农业技术的推广 ④城市市场需求量的增大 A．①② B．①③ C．②④ D．③④

物体静止在水平地面上，对它施加竖直向上的大小为F的恒定拉力，物体离地运动起来，经时间t撤去该拉力，物体又运动了时间3 t时，速度减为零，不计空气阻力，求： （1）物体的质量； （2）物体离开地面的最大高度。

可能感兴趣的题目：

物体静止在水平地面上，对它施加竖直向上的大小为F的恒定拉力，物体离地运动起来，经时间t撤去该拉力，物体又运动了时间3 t时，速度减为零，不计空气阻力，求：
（1）物体的质量；
（2）物体离开地面的最大高度。