# physics : Rock

Jun 17th, 2015
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A granite rock located on top of a hill near Sha Tin in Kowloon Hongkong, resembling a woman with child on her back. Its Cantonese name “Mong Fu Shek” literally means “the stone that is gazing out for her husband.”

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Thermal PhysicsTemperature:To understand the concept of temperature, we need to think about materials in terms of the particles from which they are made.According to the kinetic theory, when energy is supplied to an object, the particles in that object take up the energy as kinetic energy, and move faster.In solids, this motion is usually in the form of vibrations.If we are considering a gas, we imagine the molecules whizzing around their container at a greater speed. It is this kinetic energy that determines temperature.If the average kinetic energy of the molecules of a substance increases, then it is at a higher temperature. It is important to remember that internal kinetic energy on the scale of the particles that make up an object is separate from the idea of overall movement of an object. For example, as a cricket ball flies through the air, it has kinetic energy due to its overall movement. In addition to this, its molecules will be vibrating within it, and it is this internal energy that determines the temperature. The molecule In chemistry you may have learned that a molecules is a combination of atoms. However, this term can be used to refer more generally to any small particle. In kinetic theory, the term molecule is used to describe any particle, even if it is an atom.Absolute Zero:Taking energy away from the molecules of a substance causes its temperature to become lower.If you imagine a situation in which energy is continuously being

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