Question 14
A coconut nut hanging from its tree has a potential energy of 2000 J. When it falls, this potential energy is converted to kinetic energy. The kinetic energy is highest, the same as the initial potential energy, when the potential energy is 0, i.e. upon impact with a high velocity on the ground. Upon impact, this energy is converted to other forms of energy such as heat or sound. By the first law of thermodynamics (law of conservation of energy), it is theoretically possible to harness the same energy (2 000 J), by shouting or by heating, and put it into making the nut fly again, without a loss of energy. However, this is practically impossible because of what law?