I can always depend on a good friend. If he tells me he will meet me somewhere at a certain time, I can be sure that he will be there. If I need a favor, he will do his best to help me. If I am in trouble, he will not run away from me.When I meet someone who is ...
Einstein had many new ideas about physics that changed the 3 we think about the world. His most famous ide a is called the "theory of relativity."( A “theory” is an important ide a that explains something in science.) Anyway, Einstein's theory describes how time and distance are not ...
George Musser
Fluid statics is the physics of stationary fluids. Conceptual Questions 1. What physical characteristic distinguishes a fluid from a solid? 2. Which of the following substances are fluids at room temperature: air, mercury, water, glass? 3. Why are gases easier to compress than liquids and ...
They result from oscillations of the electromagnetic field and don't need a physical medium, so they, like other types of electromagnetic wave, can travel basically anywhere, through a vacuum, or through atmosphere or water. 它们产生于电磁振动,而且不需要物理媒介,所以它们,和其他类型的电磁波一样,...
A. Place flammable materials nearby B. Do not use a heat - resistant container C. Monitor the temperature constantly D. Leave the E. xperiment unattended 相关知识点: 试题来源: 解析 C。解析:选项A将易燃物放在附近在有热产生的实验中极易引发火灾,非常危险。选项B不使用耐热容器可能会导致容器损坏甚...
As we know, his father is a very famous scientist in physics. But what you don't know is that he ___ as a farmer for five years.( )A.has workedB.workedC.had workedD.works 相关知识点: 试题来源: 解析 B 【答案】本题考查动词时态.根据句意可知爸爸现在是科学家,是农民的五年是过去...
What is a field in particle physics? Define electric field stress What is the charge of a Van de Graaff generator? What determines the electric potential of a point charge? What's the difference between the electric and electrostatic force?
740.Albert Einstein, who is perhaps the greatest scientist in modern physics, is often considered one of the smartest men who ever lived. 阿尔伯特·爱因斯坦——这位或许是现代物理学领域最伟大的科学家——被公认是有史以来...
In physics, flux is a measure of the number of electric or magnetic field lines passing through a surface in a given amount time. Field lines provide a mechanism for visualizing the magnitude and direction of the field being measured. They are imaginary lines that follow different patterns, dep...