Subsystem 1 has a mass M1, a specific heat c1 and is initially at temperature T1i when it is placed in thermal contact with Subsystem 2 having a mass M2 , specific heat c2 and initial temperature T2i . Assume that system comprised of the two subsystems is thermally isolated from the rest of the universe and that neither subsystem experiences a phase change as they reach thermal equilibrium with one another. The system eventually reaches an equilibrium temperature of Teq . Derive an algebraic expression for the specific heat, c2, of Subsystem 2 in terms of the other quantities. 5. A 25 gram sample of copper is initially at a temperature of 72 o C when it is added to a 45 gram sample of water. The initial temperature of the water is 4 o C. Assume that the system is thermally isolated from the environment and determine its equilibrium temperature.