Find the phase and the missing properties of p, t, v, u, and x for water at1. 500 kpa, 100°c2. 5000 kpa, h = 1800 kj/kg3. 5000 kpa, u = 2950 kj/kg4. −6°c, v = 1 m3/kg.

Does work output exceed work input when a machine is used? a) yes, it does, as machines create energy. b) it depends on the type of machine used. c) no, it doesn’t, as machines are inefficient. d) no, it doesn’t, as machines cannot create energy.