IB DP Maths: AA HL复习笔记3.4.2 Exact Values
Trigonometry Exact Values What are exact values in trigonometry? For certain angles the values of sin θ, cos θ and tan θ can be written exactly This means using fractions and surds You should be fa...
AQA A Level Physics复习笔记7.1.2 Gravitational Field Strength
Gravitational Force There is a universal force of attraction between all matter with mass This force is known as the ‘force due to gravity’ or the weight The Earth’s gravitational fie...
AQA A Level Physics复习笔记7.1.1 Force Fields
Concept of a Force Field A force field is any region of space where a body will experience a non-contact force This will cause the body to move, interact or be deformed in some way A ...
AQA A Level Physics复习笔记6.6.5 Evolving Models of Gas Behaviour
Evolving Models of Gas Behaviour Our knowledge and understanding of the behaviour of gases has changed significantly over time The gas laws were developed by many scientists over thousands o...
IB DP Maths: AA HL复习笔记3.4.1 The Unit Circle
Defining Sin, Cos and Tan What is the unit circle? The unit circle is a circle with radius 1 and centre (0, 0) Angles are always measured from the positive x-axis and turn: anticlockwise for positi...
AQA A Level Physics复习笔记6.6.4 Brownian Motion
Brownian Motion Brownian motion of particles is the phenomenon when: Small particles (such as pollen or smoke particles) suspended in a liquid or gas are observed to move around in a random,...
AQA A Level Physics复习笔记6.6.3 Average Molecular Kinetic Energy
Average Molecular Kinetic Energy An important property of molecules in a gas is their average kinetic energy This can be deduced from the ideal gas equations relating pressure, volume, tempe...
IB DP Maths: AA HL复习笔记3.3.3 Applications of Trigonometry & Pythagoras
Bearings What are bearings? Bearings are a way of describing and using directions as angles They are specifically defined for use in navigation because they give a precise location and/or direction...
IB DP Maths: AA HL复习笔记3.3.2 Non Right-Angled Trigonometry
What is the sine rule? The sine rule allows us to find missing side lengths or angles in non-right-angled triangles It states that for any triangle with angles A, B and C Where a is the side opposi...
22fall香港留学入境最新政策有什么攻略？
22fall香港留学入境最新政策有什么攻略？如果想要去到香港不隔离的同学，那么针对非香港居民在入境香港前14天没去过香港，广东或澳门以外的其他地区，同时没去过“来港易计划暂不适用的风险地区名单”内的地方，则...
IB DP Maths: AA HL复习笔记3.3.1 Pythagoras & Right-Angled Triganometry
What is the Pythagorean theorem? Pythagoras’ theorem is a formula that works for right-angled triangles only It states that for any right-angled triangle, the square of the hypotenuse is equal to t...
IB DP Maths: AA HL复习笔记3.2.2 Volume & Surface Area
What is volume? The volume of a 3D shape is a measure of how much 3D space it takes up A 3D shape is also called a solid You need to be able to calculate the volume of a number of common shapes How...
