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Question 1).
A 1/8" diameter copper wire is covered with 1/16" thick insulation (k = 0.21 Btu/hr-ft- oF). Air blows in crossflow over the wire at 19 ft/s. The wire carries a current of 300 A and the air is at 80oF. The electrical resistivity of copper is 6.77 x 10-7?-in. Where is the insulationtemperature greatest? Determine this temperature. (NOTE: You will need to use a thermalresistance network to represent the heat transfer through the insulation into the surrounding air.)
Question 2)
The walls of a house are constructed of an exterior sheathing, insulation, framingtimber, and drywall. The composite resistance of the materials is 4.15 m2-K/W. On a winter daywhen the outdoor temperature is -5oC, wind blows at 30 km/hr parallel to the 3 m high, 18 m longwall. If the convection coefficient on the interior side of the wall is 5 W/m2-K and the interiortemperature is 21oC, determine the rate of heat loss through the wall
air is compressed in a piston-cylinder device from 100 kpa and 17 c to 800 kp reversible adiabatic process. determine
A vehicle traveling at a constant speed v in the horizontal direction encounters a triangular road bump, as shown in Fig. 4.48. Treating the vehicle as an undamped spring-mass system, determine the response of the vehicle in the vertical direction..
The frequency of resonance vibrations in graphene changed upon the addition of a mass by: Shifting to higher frequency Can shift to higher or lower frequency depending on initial conditions
A mounting bracket for electronic components is formed from sheet metal of uniform thickness. Locate the center of gravity of the bracket.
Determine the resultant of load system shown below. Locate where the resultant intersects grade with respect to point A at the base of the structure
discuss whether it would be advisable to hot work or cold work the following metals and alloys on the basis of melting
a steel beam of total length 3m is simply supported at the ends by pin-jointed supports a and c. a diagrammatic
Experimentally generate a large number of random numbers in the set 0,1,......,191 and report on the distribution of results.
Point charge between conducting planes. A point charge Q is located midway between two conducting plates. The plates are at 45° to each other. Show that the electric field intensity is perpendicular to the plates everywhere.
the pump of a water distribution system is powered by a 6-kw electric motor whose efficiency is 95. the water flow rate
water at 1mpa and 65oc enters a tube of a boiler which has a constant 160mm inside-diameter. the water leaves the tube
At a certain location, wind is blowing steadily at 10 m/s. Determine the mechanical energy of air per unit mass and the power generation potential of a wind turbine with 60 m diameter blades at that location. Take the air density to be 1.25 kg/m.
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