1) Un resort are lungimea inițială de 6cm și când este deformat are 10 cm. Știind că resortul are 40 N /m, determină: a) Forța deformatoare. B) Forța elastică. C) Ce fel de deformare elastică suferă resortul ? D) Reprezintă cele două forțe ce acționează asupra resortului .

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)