Which statement is true according to hooke's law?

a. as the force on a spring increases, the spring's length remains unchanged.

b. the distance a spring stretches has nothing to do with how much force is applied to it.

c. as the force on a spring increases, the distance it stretches increases.

d. as the force on a spring increases, the distance it stretches decreases.

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)