1-23 Air is flowing in an industrial heat- ing duct at a rate of .1 lb/sec...

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1-23 Air is flowing in an industrial heat- ing duct at a rate of .1 lb/sec at an ele- vation of 50 ft and a velocity of 50 ft/sec. It goes through a 600 watt heating coil and exits the duct at zero elevation and 4 ft/sec. The volume of air is expanded indicating the air did 4.0 watt of WORK (power). What was the rate of increase of internal energy of the air (Btu/sec) from ft to zero elevation? 1-23 Air is flowing in an industrial heat- ing duct at a rate of .1 lb/sec at an ele- vation of 50 ft and a velocity of 50 ft/sec. It goes through a 600 watt heating coil and exits the duct at zero elevation and 4 ft/sec. The volume of air is expanded indicating the air did 4.0 watt of WORK (power). What was the rate of increase of internal energy of the air (Btu/sec) from ft to zero elevation?