In a truck-loading station at a post office, a small 0.200 kg package is released from rest at point A on a track that is one-quarter of a circle with radius 1.60 mm (Figure 1). The size of the package is much less than 1.60 mm, so the package can be treated as a particle. It slides down the track and reaches point B with a speed of 5.40 m/sm/s. From point B, it slides on a level surface a distance of 3.00 mm to point C, where it comes to rest.   What is the coefficient of kinetic friction on the horizontal surface? How much work is done on the package by friction as it slides down the circular arc from A to B

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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.