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
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In a heat engine if 1000 j of heat enters the system the piston does 500 j of work, what is the final internal energy of the system if the initial energy was 2000 j ?
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As part of your daily workout, you lie on your back and push with your feet against a platform attached to two stiff springs arranged side by side so that they are parallel to each other. when you push the platform, you compress the springs. you do an amount of work of 79.0 j when you compress the springs a distance of 0.230 m from their uncompressed length. (a) what magnitude of force must you apply to hold the platform in this position? (b)how much additional work must you do to move the platform a distance 0.230 m farther? (c) what maximum force must you apply to move the platform a distance 0.230 m farther?
Answers: 1
Consider a 1000-w iron whose base plate is made of 0.5-cm-thick aluminum alloy (ρ = 2770 kg/m3, cp =...
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