Physics
The distance travelled in a particular direction.
Displacement
tiny region in the centre of the atom
Nucleus
the set of input values for a function
Domain
A term used by economists to describe all natural resources used in production
land
Convert (waste) into reusable material.
Recycle 回收
The rate of change of an object’s displacement, it is a vector quantity
Velocity
positively charged particle in the centre of the atom
Protons
a straight line that touches a curve at a point
Tangent
A curve that shows the combined maximum possible output of two products an economy can produce efficiently with existing resources and technology. It shows how much of one product must be given up to produce more of the other.
production possibility curve
To do work that is not paid, usually involving helping people
volunteer 志愿者
When the change in velocity of an object is the same in the same time period
uniform acceleration motion
atoms of the same element with different nucleon (mass) numbers
Isotopes
a rule that maps each x value to just one y value for a defined set of input x value
Function
Man-made products/resources that help to produce other goods and services
capital goods
Extremely funny and causing a lot of laughter
hilarious 很可笑的，很滑稽的
The magnitudes of a vector quantity in the horizontal direction
x-axis component
A way of representing the arrangement of the electrons in an atom.
Electronic configurations
a point P, on a curve where the value of y at this point is greater than the value of y at other points close to P.
Maximum point
An economic system in which decisions about how resources are used, what goods and services they produce and how they are allocated and taken by private sector firms and consumers
market economy
The number of years that someone is likely to live
life expectancy 预期寿命
An object remains at rest or travels at a constant velocity unless it is acted on by a resultant force
Newton’s first law of motion
energy needed to remove electrons from atom to form a positively charged ion
Ionisation energy
the part of the quadratic formula underneath the square root sign.
Discriminant
A person with enterprise and the willingness to take the risks and decisions necessary to organise scarce resources into firms to produce goods and services
entrepreneur
A person who is learning a job by working for someone who already has skills and experience
apprentice 学徒