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| Teaching Since: | May 2017 |
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MCS,PHD
Argosy University/ Phoniex University/
Nov-2005 - Oct-2011
Professor
Phoniex University
Oct-2001 - Nov-2016
A gas is contained in a closed rigid tank. An electric resistor in the tank transfers energy to the gas at a constant rate of 1000 W. Heat transfer between the gas and the surroundings occurs at a rate of Q= -Â 50t, where is in watts, and t is time, in min.
(a) Plot the time rate of change of energy of the gas for 0 ≤ t ≤ 20 min, in watts.
(b) Determine the net change in energy of the gas after 20 min, in kJ.
(c) If electricity is valued at $0.08 per what is the cost of the electrical input to the resistor for 20 min of operation?
Â
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