Hysical Science Formulating a Hypothesis
Write a hypothesis about the use of an object's physical
characteristics to determine its density. Use the format "if.
... then ... because..."and be sure to answer the lesson
question "How can the density of an object be
determined?"

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.