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Two convex objects are inside a large vacuum enclo- sure whose walls are maintained at T3 = 300 K. The objects have the same area, 0.2 m2, and the same emis- sivity, 0.2. The view factor from object 1 to object 2 is F12 = 0.3. Embedded in object 2 is a heater that generates 400 W. The temperature of object 1 is maintained at T1 = 200 K by circulating a fluid through channels machined into it.
At what rate must heat be supplied (or removed) by the fluid to maintain the desired temperature of object 1? What is the temperature of object 2?
based on observations the speed of a jogger can be approximated problems 617 by the relation v 5 7.51 2 0.04x0.3 where
A piston-cylinder device contains 50 kg of water at 250 kPa and 25°C. The cross-sectional area of the piston is 0.1 m2. Heat is now transferred to the water, causing part of it to evaporate and expand. When the volume reaches 0.2 m3, the piston re..
Find denisty altitude
Three children are standing on a 5×5-m raft. The weights of the children at Points A, B, and C are 375 N, 260 N, and 400 N, respectively. If a fourth child of weight 425 N climbs onto the raft, determine where she should stand if the other children r..
a heat pump with refrigerant-134 as the working fluid is used to keep a space at 25 celsius by absorbing heat from
water flows in a circular pipe. at one section the diameter is 0.3 m the static pressure is 260 kpa gage the velocity
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assume that the heat treatment supervisor in charge of processing the some gears is on an economy program directed
consider an air standard diesel cycle engine. at the beginning of compression the temperature is 300 k and the pressure
The rolling texture of most hcp metals can be roughly described by an alignment of the c-axis with the rolling plane normal. Zinc is an exception. The c-axis tends to be rotated as much as 80? from the rolling plane normal toward the rolling directio..
a rigid tank contains 0.1-kg of air at 300 kpa and 300 kelvin. the air is now heated until the pressure doubles.
consider a carnot power cycle running with 2 kg of water as an operating fluid. during the isothermal expansion the
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