The first law of thermodynamics is a statement of

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Conservation of heat

Conservation of work

Conservation of momentum

Conservation of energy

answer is D.

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Detailed Solution

The first law of thermodynamics applies the conservation of energy principle to systems where heat transfer and doing work are the methods of transferring energy into and out of the system. The first law of thermodynamics states that the change in internal energy of a system ΔU, equals the net heat transfer into the system Q, plus the net work done on the system W. In equation form, the first law of thermodynamics is,
ΔU=Q+W
Here ΔU is the change in internal energy U of the system. Qis the net heat transferred into the system—that is, Q is the sum of all heat transfer into and out of the system. W is the net work done on the system.

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