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The law of conservation of energy is not applicable to mechanical systems as they require energy input to keep working.

(a) True

(b) False

The question was posed to me in class test.

This intriguing question originated from Various Forms of Energy : The Law of Conservation of Energy in division Work, Energy and Power of Physics – Class 11

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Correct choice is (b) False

The explanation is: The law of conservation of energy is applicable to mechanical systems but it may not necessarily be applicable to a “machine” that requires constant power input to operate because it would then essentially be an open system.

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