A jogger hears a car alarm and decides to investigate. While running toward the car, she hears an alarm frequency of 868.5 Hz. After passing the car, she hears the alarm at a frequency of 843.5 Hz. If the speed of sound is 343 m/s. Calculate the speed of the jogger. (Express your answer to three significant figures.)

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)