A student is trying to decide what to wear. His bedroom is at 20.0 °C. His skin temperature is 35.0 °C. The area of his exposed skin is 1.50 m².People all over the world have skin that is dark in the infrared, with emissivity about 0.900.Find the net energy transfer from his body by radiation in 10.0 min.

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.