Amotion sensor acts as a transmitter when it sends out pulses and as a receiver when it listens for echoes. the delay ∆t between sending the pulse and receiving the echo is equal to 8.9 ms. the air temperature is equal to 20º c. part a what is the distance between the motion sensor and the object?

Air is to be preheated by hot exhaust gases in a cross-flow heat exchanger before it enters the furnace. air enters the heat exchanger at 95 kpa and 20°c at a rate of 0.6 m^3/s. the combustion gases (cp = 1.10 kj/kg°c) enter at 160°c at a rate of 0.95 kg/s and leave at 95°c. determine the rate of heat transfer to the air and its outlet temperature.

What’s #16 asking and how do i solve it?

Directions: count the number of atoms. ar co2 na3po4 so3 nac2h3o2