Air enters the compressor of a regenerative air-standard brayton cycle with a volumetric flow rate of 20 m3/s at 0.8 bar, 280 k. the compressor pressure ratio is 20, and the maximum cycle temperature is 1950 k. for the compressor, the isentropic efficiency is 92% and for the turbine the isentropic efficiency is 95%. for a regenerator effectiveness of 86%, determine:
(a) the net power developed, in mw.
(b) the rate of heat addition in the combustor, in mw.
(c) the percent thermal efficiency of the cycle.

Which lists the main components of darwin’s theory of evolution? a. random mutations drive evolution; the evolution of a population happens slowly; organisms have common ancestors; organisms do not change. b. natural selection drives evolution; the evolution of a population happens slowly; organisms have common ancestors; organisms change over time. c. natural selection drives evolution; the evolution of a population happens rapidly; organisms have common ancestors; organisms change over time. d. random mutations drive evolution; the evolution of a population happens rapidly; organisms have common ancestors; organisms do not change.

When a spring is compressed, the energy changes from kinetic to potential. which best describes what is causing this change? work power gravitational energy chemical energy

You are traveling in a car going at a constant speed of 100km/h down a long, straight highway. you pass another car going in the same direction which is traveling at a constant speed of 80km/h. as measured from your car's reference frame this other car is traveling at −20km/h. what is the acceleration of your car as measured from the other car's reference frame? what is the acceleration of the other car as measured from your car's reference frame?