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A solar collector consists of a long duct through which air is blown; its cross section forms an equilateral triangle 1 m on a side. One side consists of a glass cover of emissivity e1 = 0.9, while the other two sides are absorber plates with e2 = e3 = 1.0. During operation the surface temperatures are known to be T1 = 25°C, T2 = 60°C, and T3 = 70°C. What is the net rate at which radiation is transferred to the cover due to exchange with the absorber plates?
a 0.5m3 rigid tank contains refirgerant r-134a initially at 200 kpa and 40 quality. heat is now transferred untill the
boom ab is held in the position shown by three cables. knowing that the tensions in cables ac and ad are 4 kn and 5.2
a converging-diverging nozzle has a design mach number of 2.0 . the stagnation pressure at the nozzle inlet is 100
conventional ceramics have a fracture toughness of about 5 while advanced ceramics may have 20. determine1 how larger
Consider a cold air-standard Diesel cycle. Operating data at principal states in the cycle are given in the table below.For k=1.4 Cv=0.718kJ/(kg*k), and Cp= 1.005 kJ/(kg*K)
an oil pipeline was constructed to transport an oil with sg 0.8 for a distance of 10 miles. the country was hilly so
solution of oblique-angled triangle all threesides known two side at 7.5 in. and base at .3437 in. what are the angles ?
it has been determined that a point in a load-carrying member is subjected to the following stress condition sx 400 mpa
A pure copper sphere of radius 1 cm is dropped into an agitated oil bath that has a uniform temperature of 130C. The initial temperature of copper sphere is 20C.
a steam power plant utilizing the rankine cycle has the following particulars- steam pressure and temperature at inlet
solar turbines mercury 50 gas-turbine power generatorinlet air temperature 300 kinlet air pressure 100 kpa atmospheric
A hammer head H having a weight of 0.31 lb is moving vertically downward at 40ft/s when it strides the head of a nail with negligible mass and drives it into a block of wood. find the impulse on the nail if it is assumed that the grip at A is loose, ..
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