Using a hammer to drive a nail, it is the reaction force that brings the motion of the hammer to a stop but the that drives the nail into the wood.

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.

The air that we breath is made mostly of which gaseous molecule

In which of these cases are the two wave points considered to be in phase with each other?