One of the many statements of the second law of thermodynamics is: heat cannot flow from a colder body to a warmer one without external aid. assume two systems, 1 and 2, at t1 and t2 (t2 > t 1). show that if a quantity of heat q did flow spontaneously from 1 to 2, the process would result in a decrease in entropy of the universe. (you may assume that the heat flows very slowly so that the process can be regarded as reversible. assume also that the loss of heat by system 1 and the gain of heat by system 2 do not affect t1 and t2.)