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_____ is the law employed in the derivation of stagnation point.

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_____ is the law employed in the derivation of stagnation point.

(a) Hooke’s law

(b) Poisson’s law

(c) Second law of thermodynamics

(d) First law of thermodynamics

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I'd like to ask this question from Stagnation Properties in portion Compressible Flow of Fluid Mechanics

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The correct choice is (d) First law of thermodynamics

The best I can explain: First law of thermodynamics is the law employed in the derivation of stagnation point. It states that the change in the internal energy ΔU of a closed system is equal to the amount of heat Q supplied to the system, subtracting the amount of work W done by the system on its surroundings. It is a modified form of the law of conservation of energy.

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