The tesla is an Si-derived unit for the strength of a magnetic field. A scientist measures a magnetic field of strength 12.4 microteslas. Express this value in the base unit of teslas, writing your answer in
standard notation.

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.