New PDF release: CSET 123-127 physics : teacher certification exam (Second

By by Sharon Wynne.

ISBN-10: 1607877317

ISBN-13: 9781607877318

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Additional info for CSET 123-127 physics : teacher certification exam (Second Edition)

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Strictly speaking, molecules also contain some kinetic energy by rotating or experiencing other motions. The motion of a molecule from one place to another is called translation. Translational kinetic energy is the form that is transferred by collisions, and kinetic molecular theory ignores other forms of kinetic energy because they are not proportional to temperature. The pressure, temperature and volume relationships for an ideal gas (a gas described by the assumptions of the kinetic molecular theory listed above) are given by the following gas laws: Boyle’s law states that the volume of a fixed amount of gas at constant temperature is inversely proportional to the gas pressure, or: 1 V ∝ .

The most common example of an object moving in two dimensions is a projectile. A projectile is an object upon which the only force acting is gravity. Some examples: i) An object dropped from rest. ii) An object thrown vertically upwards at an angle iii) A canon ball. 8m/s2. This is most easily considered with an example such as the case of a bullet shot horizontally from a standard height at the same moment that a bullet is dropped from exactly the same height. Which will hit the ground first? If we assume wind resistance is negligible, then the acceleration due to gravity is our only acceleration on either bullet and we must conclude that they will hit the ground at the same time.

The above-mentioned examples are spontaneous as well as irreversible, both characteristic of increased entropy. Entropy change is zero for a complete cycle in a reversible process, a process where infinitesimal quasi-static changes in the absence of dissipative forces can bring a system back to its original state without a net change to the system or its surroundings. All real processes are irreversible. The idea of a reversible process, however, is a useful abstraction that can be a good approximation in some cases.

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CSET 123-127 physics : teacher certification exam (Second Edition) by by Sharon Wynne.


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