Physics, 05.02.2020 12:53 zmirandalove100
Consider a 1000-w iron whose base plate is made of 0.5-cm-thick aluminum alloy (ρ = 2770 kg/m3, cp = 875 j/kg·°c, α = 7.3x10-5 m2/s). the base plate has a surface area of 0.03 m2. initially, the iron is in thermal equilibrium with the ambient air at 22°c. taking the heat transfer coefficient at the surface of the base plate to be 12 w/m2·°c and assuming 85 percent of the energy generated in the resistance wires is transferred to the plate, determine how long it will take for the plate temperature to reach 140°c. is it realistic to assume the plate temperature to be uniform at all times? note: use an energy balance and come up with a differential equation to solve for this problem.
Answers: 1
Physics, 22.06.2019 01:00, muhammadcorley123456
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Ablock of mass 1.5 kg slides down an inclined plane that has an angle of 15. if the inclined plane has no friction and the block starts at a height of 3 m, how much kinetic energy does the block have when it reaches the bottom? acceleration due to gravity is g = 9.8 m/s2. a. 6.8 j b. 50.9 j c. 0 j d. 44.1 j
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Answers: 1
Consider a 1000-w iron whose base plate is made of 0.5-cm-thick aluminum alloy (ρ = 2770 kg/m3, cp =...
Mathematics, 15.07.2019 13:30
Mathematics, 15.07.2019 13:30
Mathematics, 15.07.2019 13:30