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Solar energy reaching the earth is about 1350 W/m2 outside the earth’s atmosphere and 950 W/m2 on earth’s surface normal to the sun on a clear day. Someone is marketing 2 m 3 3 m photovoltaic cell panels with the claim that a single panel can meet the electricity needs of a house. How do you evaluate this claim? Photovoltaic cells have a conversion efficiency of about 15 percent.
Mainframe computing used to be the only way to manage enterprise data. Then personal computers changed the data management scene. How do these two computing styles differ, and how did shift to PC-based computing evolve.
a freshly drawn glass fiber 100 microm in diameter breaks under a tensile load of 40 kn . after subsequent handling a
how do you determine the thickness of a tapering barrel of a gun at the largest end using pressure temperature on the
air at a temperature of -7c and 1 atm pressure flows along a flat surface an idealized airfoil at a constant velocity
A 50 kg hot iron block is dropped into a relatively cold lake at temperature T. During thermal equilibrium the lake receives Q amount of heat from the iron block. Show that the entropy change of the lake is Q/T starting with an expression for the spe..
a square 3m x 3m gate is located in the 45 sloping side of a dam. some measurements indicate that the resultant force
an energy-source at 1000 k transfers heat to a completely reversible heat engine. this engine transfers heat to a sink
simple cubic structure assume that a metal exists having a simple cubic crystal structure that is atoms located at the
a car drives over the top of a hill that has a radius of curvature of 100 ft. if the normal component of acceleration
a piston-cylinder assembly with a free piston contains 0.45 m3 of propane vapor and 0.05 m3 of liquid propane as a
10 kg of air in a piston-cylinder initially at 0.5 Mpa, 227 Celsius, undergoes two processes in series. constant temperature expansion to triple the volume. constant volume heating to the initial p = 0.5 MPa.
find omega3 va vb and vc of the mechanism below using the instant center graphical method. develop the linear graph and
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