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The thermal characteristics of a small dormitory refriderator are determined by performing two separate experemints, each with the door closed and the refridgerator placed in ambient air at T (inf)=25 deg C. In one case an electric heater is suspended in the fridge cavity, while the fridge is is unplugged. With the heater dissipating 20 W a steady state temperature of 90 deg C is recorded within the cavity. With the heater removed and now in operation the second experiment involves maintaining a steady state cavity temperature of 5 deg C for a fixed time interval and recording the electrical energy required to operate the fridge. In such an experiment for which steady state operation is maintaned over a 12 hour period, the input electrical energy is 125,000 J. Determine the fridges coefficient of performance COP.
a concrete sewer pipe 3 ft in dia is laid so it has a drop in elevation of 1 ft per 1000 ft of lenght. if swage assume
find the total heat loss per m length of the steam line. Find also the temperature at the interface of steam and insulation.
a cylinder made of astm a242 steel is 50cm in diameter and 250mm long and has a wall thickness of 24mm. a round bar of
a jet of air from a nozzle is blown at right angles against a wall in which a pressure tap is located. a manometer
a rigid well-insulated tank with a volume of 3 fe contains air at p1 22 lbfin2 and t1 475 bullr. the air is stirred by
air at 80 degrees fahrenheit and 80 percent relative humidity is cooled to 51 degrees fahrenheit at a constant pressure
If the bar is subjected to centric forces of magnitude P = 30 kN and knowing that EA = 70 GPa and EB = 105 GPa, determine the normal stress (a) in the aluminum layers, (b) in the brass layer.
A table shows values of a force function f(x), where x is measured in meters and f(x)in newtons. Use Simpson's Rule to estimate the work dome by the force in moving an object a distance of 18m
a 0.3 kg bullet is fired into a 3.6 kg wooden block and becomes embedded in it. knowing that the block and bullet move
an elevator is created by using a hose hanging from the top of a 10 m building. the hose is diverted into 4 jets at the
the environment in a certain area is 15 degrees c. plot the maximum efficiency of a nuclear power plant as a function
assume steady-state one dimensional heat conduction through the symmetric shape shown. assuming that there is no
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