karma poured 8kg of cold water at 23 degree Celsius to 2kg of hot water in a bucket and the final temperature was 37 degree Celsius. what was the initial temperature of the hot water? Neglect the heat lost to the surrounding.

Chemical energy is a form of energy. a. heat b. kinetic c. potential d. electromagnetic

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 is not an example of how an object gains elastic potential energy by stretching? a. jumping on a pogo stick b. pulling on a rubber band c. jumping on a trampoline