1 2 3 Three blocks are stacked one atop the others as in the figure above. What systems experience an external interaction with block 1? Choose all that apply. A system with just block 1 A system with just block 2 A system with just block 3 A system with blocks 2 and 3 A system with blocks 1 and 2 A system with all three blocks What systems experience an external interaction with block 2? Choose all that apply. A system with just block 1 A system with just block 2 A system with just block 3 A system with blocks 2 and 3 A system with blocks 1 and 2 A system with all three blocks

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Helmholtz Free Energy

The Helmholtz free energy is a thermodynamic potential used to calculate the measure of useful work from a closed system. This system is kept at constant temperature and volume. German physicist Hermann Helmholtz introduced this concept in 1882.