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A black sphere 2 in. in diameter is placed in an oven as illustrated in Fig. 9.2. The walls of the oven are maintained at 800°F and we can assume that the air in the oven is also at 800°F. Estimate the percentage of the total heat flux to the sphere which results from radiation when the surface temperature of the sphere is 200°F, 400°F, and 600°F. Use the results of Sec. 7.9 to estimate the free-convection film heat transfer coefficient.
Assuming that the allowable stress in the wood is 1200 psi, calculate the maximum permissible spacing s of the piles(Hint: Observe that the spacing of the piles may be governed by the load-carrying capacity of either the planks or the piles.
If the superalloy follows a parabolic oxidation law (x2 = a + bt, where x is the thickness, t is the time, and a and b are constants) what is the thickness after one week?
A water reservoir contains 100 tons of water at an average elevation of 60 m. The maximum amount of electric power that can be generated from this water is
an air conditioner can produce a 120 kjmin cooling effect while rejecting 2.5kw of heat. what is its cop and the
if members ac and ab can support a maximum tension of 300 lb and 250 lb respectively determine the largest weight of
There are about 35 light bulbs in the room, each with a rating of about 40 W. The rate of heat transfer through the walls and windows to the room will probably be around 15,500 kJ/h. Determine the total number of air conditioning units needed to..
Consider the question of generating electricity with silicon solar cells.
a centrifugal fan is to be used to take a flue gas at rest zero velocity and at a temperature of 352.6k and a pressure
air enters the compressor of an air-standard brayton cycle at 100kpa 300k with a volumetric flow rate of 5m3s. the
Estimate the temperature of the hottest point in the billet after five minutes of quenching. Neglect end effects; make the calculation for a cylinder of the given diameter but of infinite length.
find the complete initial and final states for the following processes t p v h u s and phase involving simple
the mass of each pulley of the system is m and the mass of the suspended object a is ma. determine the force t
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