a brick is resting on a level, smooth surface. when a student applies a horizontal force of 5 n to the brick, the force of friction on the brick is also 5 n. which statement best describes the effect of these two forces on the brick?

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.