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A large plastic casting with thermal diffusivity 6.0*10-7 m2/s is removed from its mold at a uniform temperature of 150oC. The casting is then exposed to a high-velocity air stream such that the surface experiences a sudden change in temperature to 20oC. 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.
Explain whether the following situations and should be modeled as closed systems, control volume systems, or transient systems. Convert the following temperatures to °F, °C, K, R (4 pts) a. 98.6 °F b. 298 K c. 5715 °F e. 100 °C. Convert the following..
a 2.1-m long 0.2-cm diameter electrical wire extends across a room that is maintained at 200c. heat is generated in the
What is the mass of oxygen gas in a container with a volume of 25 ft3, at a pressure of 14.7 psia and a temperature of 75oF?
A cylindrical oil-storage tank, whose diameter is 120 ft, is 60 ft deep when it is fully filled with an oil of density 55lbm/ft³. Its top is open to the atmosphere. What is the gauge pressure (psig) at the bottom of this tank?
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the engine of an automobile supplies 180 hp at 2500 rpm to the drive shaft. if the maximum shearing stress in the drive
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