you have 2 equal masses m1 and m2 and a spring with spring constant k. the mass m1 is connected to teh spring snd placed on a frictionless horizontal surface at the relaxed portion of the spring. you then hang m2, connected to m1 by a massless cord, over a pulley at the edge of the horizontal surface. when the entiresystem comes to rest in the equilibrium position, the spring is stretched an amount d1. determine amount the spring stretched when m1 is attached to m2

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)