Lecture No 3 - Homework 1. Water is flowing from the inlet to the exit. At the inlet the speed is 20m/s. Calculate (a) the speed at the exit, (b) the volumetric flow rate, and (c) the mass flow rate. 20mm 40mm 2. 0.8 kg of an ideal gas "loses" 531kJ of enthalpy during a thermodynamic process from P1 = 6bar and T1 = 1000K to P2 = 1 bar and T2 = 273K and V2 = 0.5578m3. Calculate (a) R, (b) AU, (c) AH, (d) Cp, Cv, and (e) k. 3. A 1m3 tank contains 02 (Mr = 32kg/kmol, k = 1.4) at 300 K and 5bar. 200kJ of heat is supplied. Calculate (a) the final pressure and temperature, (b) the work exchanged. 4. An ideal gas (Cv = 2kJ/kgK, Mr=8.315kg/kmol) undergoes the following processes A. 1-2: B. 2-3: C. 3-4: D. 4-1: Adiabatic compression. Constant pressure heating. Adiabatic expansion. Constant pressure cooling. P1=1bar, T1=300K, P2=10bar, q23=1250kJ/kg. Calculate (a) T2, T3 and T4, (b) All technical works exchanged, (c) All heats exchanged, (d) the thermal efficiency of the thermodynamic cycle. Con