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巧妙听到别人说活的秘密

2021-06-14 20:23 未知

  拔河比赛胜于力量吗?

  什么是拔河比赛?很多人会说:当然,哪支球队比那支强!实际上,这个问题不是那么简单。

  根据牛顿第三定律(即 当物体A在物体B上施加力时,对象B必须同时给对象A反作用力,作用力和反作用力大小相等,相反的方向并在同一行上),对于两队拔河,A对B施加了多少拉力,B也同时在A上产生相同量的拉力。

  有趣的物理学

  2020-1个1-09

  指南针为何能指向方向

  磁铁可以吸引铁, 钴, 镍

  磁铁吸引原理:金属原子结构

  大多数物质是由分子组成的分子是由原子组成的,原子由原子核和电子组成。在原子内部电子不断旋转并围绕核旋转。电子的运动都会产生磁性

  有趣的物理学

  2020-11-09

  举升如何产生

  任何飞机在起飞前都必须产生大于其自身重力的升力。这是飞机飞行的基本原理。就像我们之前提到的飞机可分为两类:轻于空中的飞机和重于空中的飞机。比飞机轻的飞机 例如气球, 飞艇 等等。,主要部分是一个大安全气囊,用比空气密度小的气体(例如热空气, 氢, 等等。),就像我们小时候的玩具氢气球一样,可以依靠空气的静态浮力上升到空气中。一千多年前我们的祖先发明了孔明灯, 一种巧妙的乐器,借助热风升空到空中。可以被认为是比空气轻型飞机的鼻祖。

  有趣的物理学

  2020-11-05

  为什么既可以助燃又可以扑灭大火?

  为什么大风可能会引起火灾,但是有时它可以用于灭火吗?风灭火器的原理是什么?让我们一起找出答案。

  1

  怎样产生火?

  要了解灭火的原理,我们必须首先了解燃烧的基本原理。燃烧是剧烈的氧化还原反应,通常会散发出火焰 同时可见光和烟雾。燃烧产生物质的燃烧需要同时满足三个必要条件:可燃物, 助燃剂和点火源。

  有趣的物理学

  2020-10-15

  在生活中,儿童最感兴趣的50个物理技巧

  机械学

  1。磨刀后迅速切蔬菜,那是, 相同压力下的受力面积越小, 压力越大。

  2。沸腾的气泡越来越多,那是, 随着深度的减小, 水压降低。

  3。饺子煮熟后会漂浮在水面上。密度变小,音量变大浮力变得更大。

  有趣的物理学

  2020-09-22

  生命中有趣的物理现象的声音和光学

  物理学与生命息息相关,每个有趣且看似习惯的生活现象都包含不同的物理含义。老胡收集了12种有趣的生活现象,包括12种物理现象,这是高中入学考试的必修物理知识,快来发现!

  1。但是听完之后我没看见他-声波在传播,当障碍物的大小小于波长时,可能会发生明显的衍射。普通墙的高度是几米,声波的波长大于壁的高度,所以,它可以绕着地面和高墙,使墙外的人都能听到; 光波的波长更短(大约10-6米),比墙壁的高度小得多所以, 人体发出的光不能衍射到墙的外面,墙外的人看不见里面的人。

  有趣的物理学

  2020-09-21

  知识渊博!如何利用物理知识更科学地减少浪费?

  “一个粥, 一顿饭当思考不容易时; 半线半线,横年的物质资源正在苦苦挣扎。“严格遵守经济,反对浪费,这是中华民族数千年来的传统美德。

  In order to thoroughly implement the spirit of the important instructions of General Secretary Jinping,Resolutely curb "waste on the tip of the tongue" in the catering process,Accelerate the formation of a social trend of "shameful waste and pride in saving".recently,The Women's Federation of Hebei Province will present various forms of "CD Action" with the theme of "Saving Food".

  At noon on the day of hoeing,Sweat drips down the soil,Who knows Chinese food,Every bit is hard.

  Fun physics

  2020-09-04

  Mechanics and temperature of interesting physical phenomena in life

  Physics is closely related to life,Each interesting and seemingly accustomed phenomenon has different physical meanings behind it.Lao Hu collected 19 interesting life phenomena,Every life phenomenon contains a compulsory physics knowledge in the senior high school entrance examination,Come and find out!

  1.Small weighing heavy weight——according to the principle of lever balance,The force is inversely proportional to the force arm,If the power arm is a fraction of the resistance arm,The power is several times the resistance.If the force arm of the weighing mound is very large,So it is completely possible to "should a thousand catties in four or two ways".

  Fun physics

  2020-08-27

  The secret of boulders in the chest

  I often see street performers performing shows with broken boulders on their chests in film and television dramas.I saw a person lying on a bed full of steel nails,Place a big stone on the chest,Another person woke up a sledgehammer,I saw the stone was broken,People are safe and sound.This is the so-called "golden bell jar,Iron cloth shirt".So how is this kind of kung fu made?

  1. Knowledge reserve and term explanation

  1. Pressure: refers to the force generated by the object on the supporting surface,This force is generally not equal to the gravity of the object,Only when placed on a horizontal surface,The pressure of the object on the contact surface is equal to the gravity of the object.

  Fun physics

  2020-06-17

  Physical problems in the flute

  The flute is a musical instrument,historical.In ancient times,People used to use the bones of longer animals,For example, the wing bones and leg bones of birds make flutes.The vertical bone flute excavated in Wuyang County, Henan Province,Is made of bird limb bones,It has a history of more than 8,000 years.To today,The Chinese flute has a very mature shape,The body is usually made of bamboo,There is a blow hole, a membrane hole,Six finger holes,And two front sound holes and two rear sound holes.

  Fun physics

  2020-06-03

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