Which of these reactions is responsible for energy radiating from stars, including the sun?
a)
nuclear fusion
nuclear fission
an exothermic chemical reaction
an endothermic chemical reaction
3

Most energy in an ecosystem comes originally from_

Apassenger walks toward the rear of a moving train. describe her motion as seen from a reference point on the train. then describe it from a reference point on the ground

Atwo-stage air compressor operates at steady state, compression 10m^3/min of air from 100 kpa and 300k to 1200 kpa. an intercooler between the two stages cools the air to 300k at a constant pressure of 350 kpa. the compression processes are isentropic. a) calculate the power required to run the compressor, in kw b) compare the result to the power required for isentropic compression from the same inlet state to the same final pressure.