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A cooked mashed potato is cooled on trays in a chilling unit with refrigerated air at 2 C blown over the product surface at high velocity. The depth pf the product is 30mm and the initial temperature is 95 C. The product has a thermal conductivity of 0.37 W/ (m K), specific heat of 3.7 kJ/kg K and density of 100 kg/m^3. Assuming negligible resistance to heat transfer at the surface, calculate product temperature at the center after 30 min.
a rod has a cross sectional area of 1 cm2. the material has the following strength characteristics beyond which the rod
refrigerant 134a is the working fluid in an air? conditioning system used to maintain a room at 24degc with heat
one cubic foot 1 ft3 of air is contained in a piston - cylinder arrangement. the axis of the cylinder is oriented in
a piston cylinder system containing 0.5 kg of air is compressed from a volume of 0.35 m3 to a volume of 0.1 m3. if the
A 10kg block sliding along a frictionless surface with a velocity of 10m/s comes into contact with a horizontal, uncompressed linear spring. If the spring slows the block down to 0 m/s while being compressed a total of 30 cm, what is its spring const..
Solve for the dynamics of the resulting system for 20 seconds of real time using midpoint method.
Air at 14.7 psia, 50°F (DB), and 60% relative humidity is first heated to 110°F (DB) and then humidified by introducing water using an “air washer.” The air leaves the humidifying section at 70°F (DB).
a 3-diameter 5-long gas-piston assembly contains air at stp. stp standard temperature and pressure conditions 300k and
Calculate the number of vacancies per cubic meter in some metal at 753°C. The energy for vacancy formation is 0.81 eV/atom, while the density and atomic weight for this metal are 6.38 g/cm3 and 49.43 g/mol, respectively. Find in m^-3 units.
a mass of 12 kg of saturated refrigerant-134a vapor is contained in a frictionless piston-cylinder device at 240 kpa.
a component is made of a brittle material that has prperties sut30 ksi and suc 90ksi. use mnst bcmt mmt to determine if
a square aluminum plate 5 mm thick and 200 mm on a side is heated while vertically suspended in quiescent air at 40c. a
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