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A power plant has an overall efficiency of 30%. The plant generates 20MW of electricity, and uses coal with a heating value of 28 MJ/kg as the fuel. Determine how much coal in tonnes per day must be burned to sustain the generation of 20MW of electricity.
a gaseous mixture consisting of 0.75 kmol of hydrogen and 0.25 kmol of nitrogen occupies 0.085 m3 at 25degreec
a small bucket of water is swinging above a persons head at a constant angular speed of 10rads. the rope is 1 m long
the pressure from water mains located at street level may be insufficient for delivering water to the upper floors of
saturated water vapor at 200 kpa is in a constant-pressurepiston cylinder assembly. at this state the piston is 0.1 m
a wall is 2m high by 3m wide and 20cm thick. it is made of a material with a k.5 wmk. a temperature difference of 60
saturated steam at 2 mpa is contained in a piston-cylinder device. the initial volume is 0.25 cubic meters. heat is
The link lies in a plane parallel to the y-z plane and the bearings are properly aligned on the shaft.
a rigid container of volume 1 m3 contains 16.13 kg of h2o of an unknown phase. the pressure of the h2o is initially 7
One kilogram of air as an ideal gas executes a Carnot power cycle having a thermal efficiency 50%. The heat transfer to the air during isothermal expansion is 50 kJ. At the end of the isothermal expansion, the pressure is 574 kPa and the volume is..
a water line is planned to connect a new reservoir to an existing water treatment plant. the average water surface
Consider the 2.0micrometer long GaAs device where the E-field is 5kV/cm and Mn*=.067M0. Calculate the transit time of an electron through the device if the mobility is 8000 cm^2V-s.
the 244000-lb space-shuttle orbiter touches down at about 230 mihr. at 193 mihr its drag parachute deploys. at 35 mihr
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