What is the energy density in j/m^3 of a plane sound wave in air at standard temperature and pressure (stp) when the sound pressure level of the wave is lp? take stp to be a pressure of 101.35 kpa and temperature of 20 c. lp (db)= 107;

Explain the difference laminar and turbulent flow. explain it with the shear stress and the velocity profiles.

The y form of iron is known as: a) ferrite b) cementite c) perlite d) austenite

Heat is added to a piston-cylinder device filled with 2 kg of air to raise its temperature 400 c from an initial temperature of t1 27 cand pressure of pi 1 mpa. the process is isobaric process. find a)-the final pressure p2 b)-the heat transfer to the air.