Defining Thermal Equilibrium Thermal energy is always transferred from a hotter region to lower region Thermal equilibrium is defined as: When two substances in physical contact with each other no ...
Thermal Energy Transfer The conservation of energy states that energy is never created or destroyed, only transferred from one form to another When a thermometer is placed in a beaker of boiling wa...
Gravitational Potential Energy Between Two Point Masses The gravitational potential energy (G.P.E) at point in a gravitational field is defined as: The work done in bringing a mass from infinity to...
Gravitational Potential The gravitational potential energy (G.P.E) is the energy an object has when lifted off the ground given by the familiar equation: G.P.E = mgΔh The G.P.E on the surface of th...
The Value of g on Earth Gravitational field strength g is approximately constant for small changes in height near the Earth’s surface (9.81 m s-2) This is because from the inverse square law relati...
Deriving Gravitational Field Strength (g) The gravitational field strength at a point describes how strong or weak a gravitational field is at that point The gravitational field strength due to a p...
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...
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, ...
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...
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...
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...
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 ...
