The development and use of alternative energy source is very necessary in present day world. Explain this statement.

Explain the doppler effect in terms of frequency, wavelength, and speed.

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.

What object a collides with object b and bounces back its final momentum is?