Provide a general expression to clearly describe how to use yourknowlegde of an atom's composition to determine the sign and magnitude of its chargge

Protons and neutrons are found within the nucleus of an atom

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.

Often called simply "velocity," this is the velocity of an object at a particular moment in time.