高含金量生物竞赛BBO和USABO难度如何？哪个比赛更适合你？
近年来，医学、生物医学、生物科学、生物化学等作为热门专业，备受不少家长和同学欢迎。 不论藤校还是G5，对于生物学相关的理工科专业，参加国际生物学术活动都能为申请增色不少。 然而与生物相关的国际学术活动...
CIE A Level Maths: Mechanics复习笔记2.2.1 Using Calculus in 1D
Using Calculus in 1D How is calculus used in kinematics? s, v and a are all functions of time Velocity, v, is the rate of change of displacement, s, with respect to time Acceleration, a, is the rat...
CIE A Level Maths: Mechanics复习笔记2.1.3 Drawing Travel Graphs
Drawing Travel Graphs How do I draw a displacement-time graph or a velocity-time graph? You may be asked to draw a displacement-time graph or a velocity-time graph You will be given information abo...
CIE A Level Maths: Mechanics复习笔记2.1.2 Velocity-Time Graphs
Velocity-Time Graphs What is a velocity-time graph? Velocity- time graphs show the velocity of an object as it moves in a straight line They show velocity (on the vertical axis) against time (on th...
CIE A Level Maths: Mechanics复习笔记2.1.1 Displacement-Time Graphs
Displacement-Time Graphs What is a displacement-time graph? Displacement-time graphs show the displacement of an object from a fixed origin as it moves in a straight line They show displacement (on...
CIE A Level Maths: Mechanics复习笔记1.1.5 Modelling Assumptions
Modelling Assumptions What is modelling in Mechanics? Mechanics uses modelling to solve problems in real life situations We use assumptions to simplify real life problems in order to turn them into...
CIE A Level Maths: Mechanics复习笔记1.1.4 Types of Force
Types of Force What is a force? A force is a vector quantity, it has both magnitude and direction A force is a push or a pull on an object A force is measured in Newtons In A level mathematical mod...
CIE A Level Maths: Mechanics复习笔记1.1.3 Derived Units
Derived Units What are derived units? Derived units for quantities such as velocity, acceleration and force etc. are combinations of S.I. units Speed or Velocity = distance ÷ time = m/s or m s-1 (V...
CIE A Level Maths: Mechanics复习笔记1.1.2 Fundamental Units
Fundamental Units What are fundamental units? Fundamental units or S.I. units are the international standardised units used around the world The three main units you will be using are: Length measu...
CIE A Level Maths: Mechanics复习笔记1.1.1 Scalars & Vectors
Scalars & Vectors Mechanics uses a variety of different scalar and vector quantities. What are scalars? Scalars are quantities without direction, they only have a size (magnitude) e.g. a speed ...
CIE A Level Physics复习笔记25.2.3 Hubble's Law & the Big Bang Theory
Hubble's Law & the Big Bang Theory Edwin Hubble investigated the light spectra emitted from a large number of galaxies He used redshift data to determine the recession velocities of these galax...
CIE A Level Physics复习笔记25.2.2 Doppler Redshift
Redshift of EM Radiation Recall the Doppler effect is defined as: The apparent change in wavelength or frequency of the radiation from a source due to its relative motion away from or toward the ob...
