What is the heat transfer mechanism responsible for the daily wind cycle

If you want to change the pitch of a sound, you have to change the

When you push downward on a book at rest on a table, you feel an upward force. does this force depend on friction? defend your answer.

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.