Which answer accurately describes the difference between speed and velocity? question 22 options: speed is the result of a change in direction. velocity is the result of a change in acceleration. gravity affects speed. gravity does not affect acceleration. speed only requires distance. velocity requires direction. speed measures a change in inertia. inertia remains the same in velocity.

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)