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Air at 20°C flows at 1 m/s between two parallel flat plates spaced 5 cm apart. Estimate the distance from the entrance where the hydrodynamic boundary layers meet.
the boy at a attempts to throw a ball over the roof of a barn with an initial speed of va18 ms. determine the
tow forces p and q are applied as shown at a point a of a hook support. knowing that p 75 n and q125 n determine
water is pumped through a horizontal 1500 m long section of steel commercial pipe with diameter of 5 cm. the pressure
a bar of high strength aluminum alloy is 150 mm long and has a circular cross section of diameter 40mm. it is subjected
a 10-m3 rigid tank contains an ideal gas mixture of nitrogen and carbondioxide at 135 kpa and 275 k. if the partial
a helium gas in a pistoncylinder is compressed from 100kpa 300 k to 200kpa in a polytropic process with n1.5. find the
air confined in a tank has an initial temperature of 1700f and an initial pressure of 60 psia. if the air is cooled
a 100-kg copper block initially at 110degc is dropped into an insulated tank that contains 150 kg of water at 15degc.
a construction crew lifts approximately 560 lb of material several times during a day from a flatbed truck to a 32 ft
Calculate the concentration of vacancies in Pb at its melting temperature of 327oC. Assume an energy for vacancy formation of 0.55 eV/atom. Lead has an atomic weight of 207.2 g/mol and a density of 11.35 g/cm3.
a double effect evaporator is used in feed forward mode to produce fresh water from sea water vontaining 3.5wt
a fixed amount of water vapor initially at 20mpa 520c is cooled at constant volume until its temperature reaches
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