Relative velocity - 相对速度
V PT = velocity of the Passenger relative to the Train = + 2.0 m/s V TG = velocity of the Train relative to the Ground = + 9.0 m/s V PG =...
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Yu Zhe
May 8, 2017
Kinematics in two dimension - 二维运动
The figure above shows an airplane moving horizontally with a constant velocity of + 115 m/s at an altitude of 1050 m. The directions to...
Yu Zhe
May 8, 2017
Atomic mass and atomic number - 元素周期表基础 - 1
Atomic mass in periodic table is equal to ‘atomic weight’ or ‘mass number’. Its unit is called atomic mass units (amu). Atomic number in...
Yu Zhe
May 8, 2017
Naming inorganic acid - 命名无机酸
我们需要考虑无机酸是否含有氧原子： 无氧原子： hydro + anion root + -ic + acid HF: Hydrofluoric acid HCN: Hydrocyanic acid H2S: Hydrosulfuric acid 有氧原子： anion...
Yu Zhe
May 8, 2017
Naming covalent compounds - 命名共价键化合物
1. the first element in the formula is named first, using the full element name. 2. the second element is named as if it were an anion....
Yu Zhe
May 4, 2017
Naming ionic compounds with polyatomic ions - 多原子的离子化合物
在上表中有很多阴离子含有不同数量的氧原子，例如(SO3)2-, (SO4)2-，我们命名氧原子数量少的后缀为-ite, 数量多的后缀为 -ate。 我们练习下以下几道题目： Na2SO4 Sodium sulfate Na2SO3 Sodium sulfite Na2CO3...
Yu Zhe
May 4, 2017
Kinematics for one dimension - a motorcycle ride
A motorcycle ride consists of two segments, as shown in the figure blow. During segment 1, the motorcycle starts from rest, has an...
Yu Zhe
May 3, 2017
Naming simple compounds - 简单无机物的英文命名
只含有两种元素的无机物命名直接参考TABLE 2.3： NaCl: Sodium chloride CaO: Calcium oxide 这种命名其实比较容易，cation阳离子采用该元素本身的英文单词，例如钙元素和钙离子都是calcium， 而阴离子则需要加后缀 -...
Yu Zhe
May 3, 2017
Kinematics for constant acceleration - 加速度恒定
A jet is taking off from the deck of an aircraft carrier, as the figure shows. Starting from rest, the jet is catapulted with a constant...
Yu Zhe
May 2, 2017
Chemistry - distillation - 蒸馏经典实验设备
也许大多数中国学生都有做过这样的化学实验，可是在用英文表达时我们似乎哑口无言，记得在雅思托福口语考试准备时，很多学生想讲一个自己做过的实验，大家都会记得蒸馏实验的中文描述，却不知道接受瓶receiving flask这样一个简单的实验设备如何说。而对于在国际学校读书的学生更...
Yu Zhe
May 2, 2017
Chemistry/Physics - density - 密度比较
上面的表格直观地体现了密度在不同状态的物质中的区别，大致上我们可以总结为固体密度大于液体密度大于气体密度。 水分子在固体ice，液体water和气体gas中明显体现出了分子间的密度差异性。通过图解的方式会让我们对于抽象的物理化学原理能够有更深刻的理解。 #Chemistry...
Yu Zhe
May 2, 2017
Chemistry/Physics - temperature - 温度换算
关于温度的换算是一个非常基本的化学和物理常识： Temperature (Kelvin) = temperature (Celsius) + 273.15 大家发现Kelvin和实际温度的关系，也是比较容易理解的，接下来我们要强调下Fahrenheit和Celsius之间的...
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