The ability of the heart, blood vessels and lungs to supply oxygen to the body is?

What is work? how much work is done to move an object 0 meters?

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.

Which changes would result in a decrease in the gravitational force btween two objects? check all that apply