Engineering, 16.11.2019 05:31 hlgerardip4wbhx
Aroom with dimensions of 4m-by-5m-6m is to be heated by an electrical resistance heater placed in a short duct in the room. initially, the room is at 15oc and the local atmospheric pressure is 98 kpa. the room is losing heat steadily to the outside at a rate of 150 kj/min. a 200-w fan circulates the air steadily through the duct at a rate of 40 kg/min. it can be assumed that the duct operates adiabatically and there is no air leaking out or into the room. it takes 20 minutes for the average room temperature to reach 25oc. determine (a) the power supplied to the resistance heater and (b) the change in temperature of the air between the entrance and exit of the duct. (ans: (a) 3.15 kw; (b) 5 ? oc)
Answers: 3
Engineering, 03.07.2019 15:10
Apiston-cylinder with a volume of 0.25 m3 holds 1 kg of air (r 0.287 k/kgk) at a temperature of 100 c. heat transfer to the cylinder causes an isothermal expansion of the piston until the volume triples. how much heat is added to the piston-cylinder?
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Engineering, 04.07.2019 18:10
Draw the engineering stress-strain curve for (a) bcc; (b) fcc metals and mark important points.
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Engineering, 04.07.2019 18:10
A-mn has a cubic structure with a0 0.8931 nm and a density of 7.47 g/cm3. b-mn has a different cubic structure, with a0 0.6326 nm and a density of 7.26 g/cm3. the atomic weight of manganese is 54.938 g/mol and the atomic radius is 0.112 nm. determine the percent volume change that would occur if a-mn transforms to b-mn.
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Engineering, 04.07.2019 18:20
Avolume of 2.65 m3 of air in a rigid, insulated container fitted with a paddle wheel is initially at 264 k, 5.6 bar. the air receives 432 kj by work from the paddle wheel. assuming the ideal gas model with cv = 0.71 kj/kg • k, determine for the air the amount of entropy produced, in kj/k
Answers: 2
Aroom with dimensions of 4m-by-5m-6m is to be heated by an electrical resistance heater placed in a...
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