Astream of smoothly flowing water arcs through the air and hits the side window of a house. it then spreads out smoothly in all directions along the window. at the surface of the window, right where the stream of water hits it, the water's pressure is(a) lower than atmospheric and the water's speed is faster than in the stream.(b) higher than atmospheric and the water's speed is faster than in the stream.(c) higher than atmospheric and the water's speed is slower than in the stream.(d) lower than atmospheric and the water's speed is slower than in the stream.

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)