*3-28. Determine the tension developed in each cord required for equilibrium of the 20-kg lamp. 3-29. Determine the maximum mass of the lamp that the cord system can support so that no single cord develops a tension exceeding 400 N. A B 45° DO E 30° 3-59 A piston-cylinder device initially contains 50 L of liquid water at 40°C and 200 kPa. Heat is transferred to the water at constant pressure until the entire liquid is vaporized. (a) What is the mass of the water? (b) What is the final temperature? (c) Determine the total enthalpy change. (d) Show the process on a T-v diagram with respect to