Use the ke vs. time graph below to answer the following questions. express all answers in the appropriate mks units. ke vs. time graph a.) identify when the object was not moving. b.) over what period of time was the object speeding up? to c.) over what period of time was the object slowing down? to d.) over what period of time was the object maintaining a constant speed? to e.) determine the work done during the following 3 time frames: 0 to 50 s → 50 to 150 s → 150 to 250 s → f.) determine the total work done. g.) determine the power at the following 3 times: 25 s → 60 s → 215 s →

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)