美国大学常见专业类型盘点
对于出国留学的学生们而言，美国是现阶段大部分学生的留学目标国家，因为美国在教育方面是世界领先的，专业设置也是非常的丰富。对于留学生来说，大学专业的选择几乎就决定了未来的发展方向。今天我们就先来了解...
CIE A Level Physics复习笔记13.1.4 Geostationary Orbits
Geostationary Orbits Many communication satellites around Earth follow a geostationary orbit This is a specific type of orbit in which the satellite: Remains directly above the equator, therefore, ...
CIE A Level Physics复习笔记13.1.3 Circular Orbits in Gravitational Fields
Circular Orbits in Gravitational Fields Since most planets and satellites have a near circular orbit, the gravitational force FG between the sun or another planet provides the centripetal force nee...
CIE A Level Physics复习笔记13.1.2 Gravitational Force Between Point Masses
Newton's Law of Gravitation The gravitational force between two bodies outside a uniform field, e.g. between the Earth and the Sun, is defined by Newton’s Law of Gravitation Recall that the mass of...
CIE A Level Physics复习笔记13.1.1 Gravitational Fields
Defining Gravitational Field There is a force of attraction between all masses This force is known as the ‘force due to gravity’ or the weight The Earth’s gravitational field is responsible for the...
CIE A Level Physics复习笔记12.2.3 Calculating Centripetal Force
Calculating Centripetal Force An object moving in a circle is not in equilibrium, it has a resultant force acting upon it This is known as the centripetal force and is what keeps the object moving ...
CIE A Level Physics复习笔记12.2.2 Calculating Centripetal Acceleration
Calculating Centripetal Acceleration Centripetal acceleration is defined as: The acceleration of an object towards the centre of a circle when an object is in motion (rotating) around a circle at a...
CIE A Level Physics复习笔记12.2.1 Centripetal Acceleration
What Causes Centripetal Acceleration? Velocity and acceleration are both vector quantities An object in uniform circular motion is continuously changing direction, and therefore is constantly cha...
CIE A Level Physics复习笔记12.1.2 Angular Speed
Angular Speed Any object travelling in a uniform circular motion at the same speed travels with a constantly changing velocity This is because it is constantly changing direction, and is therefore ...
