Engineering, 22.08.2019 16:30 MK100
A2 mx 1.5 m section of wall of a furnace is not insulated and the temperature at the outer surface of this section is measured to be 110 °c. the temperature of the furnace room is 32 °c. it is proposed to insulate this section with glass wool insulation (k = 0.038 w/m. k) in order to reduce the heat loss by 90 percent. determine the thickness of the insulation using the total thermal resistance, assuming the outer surface temperature of the metal section still remains at 110 °c, the effective convection heat transfer coefficient at the surface of the outer furnace is h = 10 w/m²k and disregarding any radiation.
Answers: 3
Engineering, 03.07.2019 14:10
Amass of 1.5 kg of air at 120 kpa and 24°c is contained in a gas-tight, frictionless piston-cylinder device. the air is now compressed to a final pressure of 720 kpa. during the process, heat is transferred from the air such that the temperature inside the cylinder remains constant. calculate the boundary work input during this process.
Answers: 2
Engineering, 04.07.2019 18:10
At 12 noon, the count in a bacteria culture was 400; at 4: 00 pm the count was 1200 let p(t) denote the bacteria cou population growth law. find: (a) an expression for the bacteria count at any time t (b) the bacteria count at 10 am. (c) the time required for the bacteria count to reach 1800.
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Engineering, 04.07.2019 18:10
Burgers vector is generally parallel to the dislocation line. a)-true b)-false
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Engineering, 04.07.2019 18:10
Calculate the bore of a cylinder that has a stroke of 18 inches and an extension time of 6 seconds at a flow rate of 4 gal/min.
Answers: 3
A2 mx 1.5 m section of wall of a furnace is not insulated and the temperature at the outer surface o...
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