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1. Cranberries are harvested by flooding the bogs in which they are grown and raking them into troughs for transport. At the processing plant, the surface moisture on the berries is removed as they roll over a fine screen through which warm air is blown. The berries have an average diameter of 15 mm, and the thickness of the water layer is 0.2 mm.
2. A spherical drop of water, 0.5 mm in diameter, is falling at a velocity of 2.15 m/s through dry, still air at 1-atm pressure. Estimate the instantaneous rate of evaporation from the drop if the drop surface is at 60°C and the air is at 100°C.
3. A spherical droplet of alcohol, 0.5 mm in diameter, is falling freely through quiescent air at a velocity of 1.8 m/s. The concentration of alcohol vapor at the surface of the droplet is 0.0573 kg/m3, and the diffusion coefficient for alcohol in air is 10-5 m2/s. Neglecting radiation and assuming steady-state conditions, calculate the surface temperature of the droplet if the ambient air temperature is 300 K. The latent heat of vaporization is 8.42 X 105 J/kg.
packages are thrown down an incline at a with a velocitynbspof 1 ms. the packages slide along the surface abc to
Using the required parameters for a typical large size car* and an appropriate frontal Quarter-Car model.
a steam rankine cycle operates between the pressures of 2500 psi in the boiler and 1 psi in the condenser. the turbine
the lowest temperature that has been achieved is about 1 times 10-6 k. to achieve this an additional stage of cooling
a car is traveling at a constant speed of 35 mph. what is the normal component of acceleration of the car at the top of
an array of power transistors dissipating 5 w of power each are to be cooled by mounting them on a 25cm x 25cm square
a refrigeration system has a coefficient of performance of 5. the heat rejection is an isothermal process at 37c. what
a baseball is thrown by a pitcher at 95 mph through standard air. the diameter of the baseball is 2.82in. estimate the
A balloon behaves so the pressure is P = C2V1/3, C2 = 100 kPa/m. The balloon is blown up with air from a starting volume of 1 m3 to a volume of 3 m3. Find the final mass of air assuming it is at 25oC and the work done by the air.
a cylindrical specimen of some metal alloy having an elastic modulus of 108 gpa and an original cross-sectional
a four-cylinder spark ignition engine has a compression ratio of 8 and each cylinder has a maximum volume of 0.6l. at
a discuss the assumption that when a piece of metal is deformed at constant temperature its volume is unchanged.b a
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