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System is in the equilibrium if all the forces (external and reactional - internal) are in the equilibrium - resulting force is zero vector.

Free body diagram is drawn for each body of the mechanical system. The body is disconnected from the system and contacts (sometimes called joints) are replaced by reactional forces. Then for each body equations of equilibrium can be written based on the principle of equilibrium.

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Principle of generator?

Light may be generated in two conditions. a) when a material is heated sufficiently that it glows - so-called black-body radiation, b) when an excited electron; previously raised to a higher energy level than its natural state; is allowed to cool and return to its natural energy level. In this energy shift, it will emit a quantum of light quite specific to the element concerned, and the energy change.

Related Questions

What is body fitness?

a principle that tries to explain something that happens in nature


What is meant by fbd in mechanics?

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