Aheating system that uses heated water has a total heating load of 300,000 btuh. how much heated water flow in gallons per minute (gpm) is required to satisfy the total load if the system is designed for: a) a 25°f temperature change b) a 35°f temperature change

What is created when solids, liquids, an gases mix with one another

Air is contained in a variable-load piston-cylinder device equipped with a paddle wheel. initially, air is at 400 kpa and 17°c. the paddle wheel is now turned by an external electric motor until 75 kj/kg of work has been transferred to air. during this process, heat is transferred to maintain a constant air temperature while allowing the gas volume to triple. calculate the required amount of heat transfer in kj/kg.

Suppose that 27 j of work is needed to stretch a spring from its natural length of 6 m to a length of 9 m. (a) how much work is needed to stretch the spring from 12 m to 14 m? j (b) how far beyond its natural length will a force of 78 n keep the spring stretched?