Directions: Consider a 2-kg bowling ball sits on top of a building that is 40 meters tall. It falls to the ground. Think about the
amounts of potential and kinetic energy the bowling ball has:
· as it sits on top of a building that is 40 meters tall.
. as it is half way through a fall off a building that is 40 meters
tall and travelling 19.8 meters per second.
· as it is just about to hit the ground from a fall off a building
that is 40 meters tall and travelling 28 meters per second.
When

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)