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3. (35 pts) A four-inch cube of copper is at rest at the bottom of a 50 -cubic-foot tank filled with water. The top face of the cube is 10ft down from the water surface which is open to an atmospheric pressure of 14.7psi. The specific weight (weight-per-volume) of water and copper are 62.4lbf/ft3 and 558 lbf/ft3, respectively. a. (21 pts) If the copper is significantly hotter than the water, define a system and write an energy equation for the system as the cube and water come to thermodynamic equilibrium. List every reasonable assumption needed to identify which terms are zero in your energy equation. b. (7pts) Compute the absolute pressure of the water (in psi) at the top face of the copper cube. c. (7 pts) List one assumption necessary for your calculation in part b to be valid. Be specific