Response to the following problem:
Calculate the entropy change of the universe as a result of the following processes:
(a) A copper block of 0.4 kg mass and with heat capacity at constant pressure of 150J/K at 100°C is placed in a lake at 100°C.
(b) The same block at 100C is dropped from a height of 100m into the lake.
(c) Two such blocks at 100°C and O°C are joined together.