Q. 3) The relation Fé - Prı = 0 is called
A) Doppler's Principle
B) Lagranges Principle
C) D'Alembert's Principle
D) None of these
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c)D'Alembert's Principle
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Gravity, also called gravitation, in mechanics, the universal force of attraction acting between all matter. ... On Earth all bodies have a weight, or downward force of gravity, proportional to their mass, which Earth's mass exerts on them. Gravity is measured by the acceleration that it gives to freely falling objects.
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