POSSIBLE POI A car horn emits a frequency of 400 Hz in 20 °C air, at which temperature the speed of sound is 343 m/s. If th car moves toward a stationary observer at 20 m/s, what is the observed frequency of the horn? vtV obs obs source V y source V %3D source obs V = V source

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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.