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A thick black-painted wood block at 20 C is subjected to constant solar flux of 1250 W/m2. If the absorptance of the block is 0.92 what is the temperature of the exposed surface after a time of 20 minutes? What is the temperature if the block were made of aluminum?
Use potential flow theory to determine the lift coefficient of a spinning baseball in terms of the forward velocity (V ) and spin RPM.
a refrigerator uses 134a as the working fluid and operates on the ideal vapor-compression refrigeration cycle. the
An ideal vapor-compression refrigeration system operates at steady state with Refrigerant 134a as the working fluid. Superheated vapor enters the compressor at 30 lbf/in2, 20F, and saturated liquid leaves the condenser at 140 lbf/in2. The refriger..
three equal charges of magnitude q6.00 uc are located at three corners of a square edge length d2.9 cm. a negative
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 flywheel can be considered as being composed of a thin disc and a rim. the rim weighs 322 lb and has diameters of 24
an insulated rigid tank initially contains 1.8 ibm of helium at 82 f and 45 psia. a paddle wheel with a power rating of
kic for the aluminum alloy used in making a structure is 45mpam0.5. if the structure contains a crack 2.5mm long what
a useful figure of merit comparison between batteries that have the same voltage is the ampere-hour ah rating. for
a double effect evaporator is to be employed in concentrating 15 solution of naoh at 700f to 40. the condensing
air is cooled and dehumidified as it flows over the coils of a refrigeration system at 1atm from 25degc and a humidity
Calculate the actual power transmitted to the second pulley and calculate the power which can be transmitted if the maximum tension in the belt is limited to half of the ultimate strength of the belt.
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