Asmooth sphere with a diameter of 90 mm is observed to fall through air at a temperature of 100 c with a terminal speed of 100 m/s. a) calculate the weight of the sphere. b) could the speed be increased by making the surface of the sphere rougher? support your answer. c) for these conditions, can the air be considered incompressible?

Abrayton cycle operates with a regenerator on the air-standard with properties evaluated at 400 k. the tem- perature of the air entering the compressor is 350k while the temperature of the air exiting the compressor is 600 k. the temperature of the air entering the turbine is 1600 k. the overall cycle produced 600 kj/kg of net work out. assuming a regenerator effectiveness of 0.8, what is the temperature of the air before heat addition (combustion)? draw this process on a t - s diagram