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Consider a 24-KW hooded electric open burner in an area where the unit costs of electricity and natural gas are $0.10/KWh and $1.20/therm (1 therm=105,000 kJ), respectively. The efficiency of open burners can be taken to be 73 percent for electric burners and 38 percent for gas burners. Determine the rate of energy consumption and the unit cost of utilized energy for both electric and gas burners.
a cylindrical bar of radius 15 mm and length 100 mm is held at both ends. if at 30 degc no axial force exists in the
the pilot of flighter plane f is following 1.5 behind the pilot of bomber b. both planes are originally traveling at
the thickness of a set of gaskets varies because of random manufacturing disturbances but the thickness values measured
a turbine produces 2 mw of power while accepting steam at 3 mpa and 400 c and rejecting steam at 50 kpa and 100c. find
five kg of r-22 refrigerant at 3 bar and saturated vapor is contained in a closed rigid tank. a process cools the r-22
given that the relaxation time a is 177.46 days what is the activation energy of a rubber band if the pre-exponential
An engineer insists that a component is fully constrained with 0 DOF because 2 plates are bolted together with 4 screws (assuming one of the 2 plates is considered "grounded"). Is he / she correct? Explain why or why not using concepts discuss..
during a particular thunderstorm the electric potential difference between a cloud and the ground is vcloud - vground
The entrance is inward projecting. What flow will be expected if the gate valve is one-half open?
The maximum take-off mass of an Airbus A380 passenger jet is about 600 000 kg. The lift is provided by the wings, which have a total area of 845 m2.
one cubic foot 1 ft3 of air is contained in a piston - cylinder arrangement. the axis of the cylinder is oriented in
a sealed cylindrical vessel of 60 cm diameter and 80 cm height contains 3.2 kg of a gas. the pressure measured with a
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