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;

Acompressor receives the shaft work to decrease the pressure of the fluid. a)- true b)- false

The higher the astm grain size number, the finer the gran is. a)-true b)-false

Which of the following ziegler nichols tuning methods the response of the controller to a step input should exhibit an s-shaped curve? a)-open loop mode b)-closed loop mode c)-both modes (open & closed) d)-none of the modes (open & closed)