Engineering, 07.04.2020 00:21 hsjsjsjdjjd
A thick steel slab (rho = 7800 kg/m3 , c = 480 J/kg·K, k = 50 W/m·K) is initially at 300°C and is cooled by water jets impinging on one of its surfaces. The temperature of the water is 25°C, and the jets maintain an extremely large, approximately uniform convection coefficient at the surface. Assuming that the surface is maintained at the temperature of the water throughout the cooling, how long will it take for the temperature to reach 50°C at a distance of 25 mm from the surface?
Answers: 1
Another question on Engineering
Engineering, 04.07.2019 19:10
Starting wih an energy balance on a rectangular volume element, derive the one- dimensional transient heat conduction equation for a plane wall with constant thermal conductivity and no heat generation.
Answers: 1
Engineering, 04.07.2019 19:20
Determine the stoichiometric and actual air-fuel ratios and the mole flue gas composition for combustion with 15% excess air for raw indiana, pennsylvania raw coal.
Answers: 3
Engineering, 06.07.2019 02:30
Plot schematically the tensile stress versus strain curves for a typical thermoplastic material at a temperature below its glass transition temperature (tg and at a temperature above its tg, respectively. do the same for a typical thermosetting material. list in a table any differences or similarities between the two materials at t> tg and t < tg, respectively, and relate them to the structures of the two types of polymers
Answers: 3
Engineering, 06.07.2019 03:10
Oxygen at 300 kpa and 400 k is in a closed system with an initial volume of 0.1 m3. is now compressed in a polytropic process, with exponent of n 1.2, to a temperature of 500 k. calculate: a) the boundary work done during the compression, in kj b) the heat transfer during the compression, in kj
Answers: 3
You know the right answer?
A thick steel slab (rho = 7800 kg/m3 , c = 480 J/kg·K, k = 50 W/m·K) is initially at 300°C and is...
Questions
History, 05.05.2020 14:58
Mathematics, 05.05.2020 14:58
Mathematics, 05.05.2020 14:58
Mathematics, 05.05.2020 14:58
Mathematics, 05.05.2020 14:58
Mathematics, 05.05.2020 14:58
Health, 05.05.2020 14:58
Mathematics, 05.05.2020 14:58
Mathematics, 05.05.2020 14:58
Mathematics, 05.05.2020 14:58
