Acertain type of d-cell battery that costs $0.50 is capable of producing 1.3 v and a current of 0.3 a for a period of 75 hours.

determine the cost of the energy delivered by this battery per kilowatt hour. (for comparison, the approximate cost of energy purchased from electric utilities in the united states is $0.12 per kilowatt hour.)

Water at 70°f and streams enter the mixing chamber at the same mass flow rate, determine the temperature and the quality of the exiting stream. 0 psia is heated in a chamber by mixing it with saturated water vapor at 20 psia. if both streams enters the mixing chamber at the same mass flow rate, determine the temperature and the quality of the existing system.

The higher the astm grain size number, the finer the gran is. a)-true b)-false

Air is compressed isentropically from an initial state of 300 k and 101 kpa to a final temperature of 1000 k. determine the final pressure using the following approaches: (a) approximate analysis (using properties at the average temperature) (b) exact analysis