您所在的当前位置：初中物理试题 >

动能与势能的应用

> 如图为麦克斯韦滚摆，当它在最高处时，重力势能______，动能______；当它由上而下滚动时，重力势能______，动能______；当它到达最低处时，重力势能______，动能______；当它由下而上滚动时，重力势能______，动能______．

问题：

发布时间：2024-09-09

如图为麦克斯韦滚摆，当它在最高处时，重力势能，动能；当它由上而下滚动时，重力势能，动能；当它到达最低处时，重力势能，动能；当它由下而上滚动时，重力势能，动能．

参考答案：

提问用户：1r***ndi

可能感兴趣的题目：

1 今年4月20日，四川芦山发生了里氏7.0级大地震，给当地人民造成了巨大的损失，“一方有难，八方支援”，我县某中学全体师生积极捐款，其中九年级的三个班学生的捐款金额如下表：班级（1）班（2）班（3）班金额（元） 2000 吴老师统计时不小心把墨水滴到了其中两个班级的捐款金额上，但他知道下面三条信息：信息一：这三个班的捐款总金额是7700元；信息二：（2）班的捐款金额比（3）班的捐款金额多300元；信息三：（1）班学生平均每人捐款的金额大于48元，小于51元．请根据以上信息，帮助吴老师解决下列问题：（1）求出（2）班与（3）班的捐款金额各是多少元；（2）求出（1）班的学生人数．
2 用天气符号表示“晴转阴”，正确的是（）
3 某校六(2) 班以“北京奥运会”为主题开展了一次知识竞赛活动，共有30 道题，每答对一题得5 分，答错或不答一题都扣2 分，若小明得分超过96 分，则他至少答对多少道题？
4 有网友“晒出”父母给自己发过的短信：“孩子，天冷了，注意别着凉。”“读书的面可以再宽一些，知识充实了，思路才敏捷。”……这些简短朴实的话语凝结着 ①家人的浓浓亲情 ②家长对子女的唠叨不休 ③父母对子女健康成长的期盼 ④父母对子女生活无微不至的关怀 A．①②③ B．①②④ C．①③④ D．②③④
5 阅读《话说中国画》，回答问题。概括本文主旨。 ____________________________________
6 阅读理解 The undersea world is very beautiful. Now more and more people want to dive in the water to find the secret there. Scuba diving is a new sport today. It can take you into a wonderful undersea world. You will find many strange animals in the sea. Some are as large as a school bus. Many sea animals give out light in the dark and some have sharp teeth. During the day, there is enough light. Here, under the sea, everything is blue and green. When fishes swim nearby, you can catch them with your hands. When you have bottles of air on your back, you can stay in deep water for a long time. However, you can"t dive too deep. And you must be very careful when you dive in deep water. The deep sea is not an easy place to live in. It"s cold. And it"s dark, too. The deeper it is, the less sunlight there is. At about 3,000 feet, there is no light at all. It is very dark in the sea. Many fishes have no eyes. Some have big eyes. A few have eyes on one side. Besides(除了) the cold and the darkness, deep-sea animals face a third danger than other animals. Animals eat! They must find food to eat. Many animals eat plants. However, some animals eat meat. This means these sea animals have two big jobs. They need to find animals as food, and they have to try not to become other animals" meal. 1. Why do people want to dive in the sea? Because __________. A. they want to catch fish B. they want to find the secrets of the undersea world C. the sea is deep 2. In the daytime, when you dive in the sea, you __________. A. can see everything green and blue B. can"t be in danger C. can catch nothing 3. How many dangers will animals meet in the deep sea? A. One. B. Two. C. Three. 4. When you do scuba diving, you can __________. A. stay in deep water for a long time B. dive very, very deep C. live in deep water easily 5. The WRONG sentence is __________. A. one animal finds something to eat, and it may be eaten by others B. at the depth of 3,000 feet under the sea, many animals can find their way by hearing and feeling C. at the depth of 3,000 feet under the sea, all animals can find their way by seeing
7 常吃标准米、标准面能有效预防 [ ] A．夜盲症 B．脚气病 C．坏血病 D．佝偻病
8 现有甲、乙、丙三种金属，将甲、乙两种金属分别放入硫酸铜溶液中，甲表面有红色固体析出，乙没有明显现象；将甲、丙分别与相同的稀硫酸反应，甲比丙反应慢。由此推测这三种金属活动性由弱到强的顺序为 A．丙＞甲＞乙 B．甲＞乙＞丙 C．乙＞甲＞丙 D．丙＞乙＞甲
9 小丽同学在做“探究平面镜成像特点”的实验时，将一块玻璃板架在水平实验台上，如图所示。（1）小丽同学取两段完全相同的蜡烛A和B，如图所示，点燃玻璃板前的蜡烛A，并意图移动蜡烛B放在所看到的蜡烛A的像的位置，然后进行数据测量但是无论她向哪个方向移动蜡烛B，始终不能得到像与物到镜面的距离相等的正确结论，你认为她在实验中出现的主要问题是：_________________。（2）在实验中，小丽想证明平面镜所成的像是虚像，她应该如何操作：______________________。
10 下列化学药品保存方法中不符合要求的是 [ ] A．避免阳光直接照射 B．易燃、易爆等危险品必须单独存放 C．易挥发、腐蚀类药品应分别密闭保存 D．药品只要分类摆放即可，不用做出特别规定