Motor oil, with a viscosity of 0.25 n ∙ s/m2, is flowing through a tube that has a radius of 3.0 mm and is 1.0 m long. the drop in pressure over the length of the tube is 200 kpa. what is the average speed of the oil

Air enters a gas turbine with two stages of compression and two stages of expansion at 100 kpa and 17°c. this system uses a regenerator as well as reheating and intercooling – the intercooler returns the air to the inlet temperature. the pressure ratio across each compressor is 4 ; 300 kj/kg of heat are added to the air in each combustion chamber; and the regenerator operates perfectly while increasing the temperature of the cold air by 20°c. determine the system’s thermal efficiency. assume isentropic operations for all compressor and the turbine stages and use constant specific heats at room temperature. (0.378)