You are listening to music in your room and you are asked to turn down the volume of your music. when you turn down the volume what will happen to the sound waves' amplitude?

Current enters a circuit at a: 1.positive terminal 2.negative terminal 3.low potential side 4.resistor

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 describes increasing the efficiency of energy resource