What does Newton's first law of motion imply about an object in motion? A. It will tend to exert a friction force on the air around it.
B. It will tend to slow down until it comes to rest,
C. It will tend to remain at a constant velocity unless acted upon by a
force
D. It will tend to accelerate until it reaches the speed of light unless
acted upon by a force.

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)