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A large plastic casting with thermal diffusivity 6.0 x10^7 m2 /s is removed from its mold at a uniform temperature of 150 degrees C. The casting is then exposed to a high-velocity air stream such that the surface experiences a sudden change in temperature to 20 degrees C. Assuming the casting approximates a semi-infinite medium and using a finite-difference method with a space increment of 6mm, estimate the temperature at a distance of 18 mm from the surface after 3 min have elapsed.
a heat pump with refrigerant-134 as the working fluid is used to keep a space at 25 celsius by absorbing heat from
A hydraulic system is operating at a Reynolds number of 1000. if the temp increases so that the oil viscosity decreases, would the Reynolds number, increase, decrease, or remain the same explain. Show all work and explain
a closed system contains 0.6 kg of helium at 156 kpa with a volume 0.4m3. this systme undergoes a polytropic process
a time traveler finds himself in an unknown place on earth at an unknown time of the year. the sky is cloudy at night
a cubic tank 1m3 is filled with air at 280k and 100 kpa. it is fitted with a relief valve that will vent at 600 kpa.
hyundai advertises a 10 year-100000 mile power-train warranty for its cars. you work for a competitor and want to see
consider a fuel cell pt1h2 0.5 atmnaoh 1mo2 1 atmpt2a which pt electrode is the cathode and explain why?b what are two
an air conditioner in the airport of timbuktu runs a cooling system using r-410a with a high pressure of 1500 kpa and a
Air at 22 kPa, 220K and 250 m/s enters a turbojet engine in flight at an altitude of 10,000m. The diffusor slows the air down to a very low speed relative to its inlet. The pressure ratio across the compressor is 12. The turbine inlet temperature is ..
large wind turbines with blade span diameters of over 100 m are available for electric power generation. consider a
steam enters a turbine at 40 bars 440c and 100 ms through an pipe with a cross-sectional area of 0.050 m2. at the exit
i need you to write a report about heat treatment of steel. i will attach the report format which you need to stick
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