On paper, make a careful scale drawing of the two rhenium nuclei just after fission, and label the drawing with the distances that you just calculated. if the two rhenium nuclei are nearly touching, this would be consistent with our model of fission, in which the th-228 nucleus fissions into two pieces that are initially nearly at rest. how big is the gap between the surfaces of the two nuclei? (if you have done the calculations correctly, you will indeed find that the gap is a rather small fraction of the center-to-center distance, which means that our simple model for the fission process is a pretty good model.)

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)