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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 X 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.
on an assembly line that fills 8-ounce cans a can will be rejected if its weight is less than 7.90 ounces. in a large
a piston cylinder arrangement contains 0.4 m3 of saturated water vapor at 200 kpa. the piston is resting on a pair of
ammonia enters a heat exchanger operating atsteady state as a superheated vapor at 14 bar 60degc where itis cooled and
if the seat pocket diameter in a ball valve is 5.000 the seat seal ring to ball sealing diameter is 4.438 and the
if you find another software easier to do fea in then go ahead and use that instead we are just interested in the
air expands through a nozzle from a chamber pressure and temperature of 300 psia and 1000 r respectively to an exit
standards for firewalls may be based on their thermal response to a prescribed radiant heat flux. consider a
the airbus a-340 passenger plane has a maximum takeoff weight of about 260000 kg a length of 64 m a wing span of 60 m a
an open brayton cycle engine operates with a compressor-pressure ratio of 6 an inlet temperature of 20 c and inlet
a particular house wall consists of three layers and has a surface area of 30 m2. the inside layer is 10 mm thick and
A steel alloy to be used for a spring application must have a modulus of resilience of at least 2.07 MPa (300 psi). What must be its minimum yield strength?
Knowing that in the position shown the rod has angular velocity of 4 rad/s clockwise; determine the angular velocity of the rod after it has rotated through a 90°.
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