Problem 1: a small disk 5 mm in diameter is positioned and the center of an isothermal hemispherical enclosure aperture the disk is at 900 k, and has a diffuse gray surface with an emissivity of 0.7. the hemispherical adiabatic enclosure has a radius of r 100 mm and an emissivity 450 of 0.85. the enclosure has a small aperture of 2mm diameter. by radiative network analysis, determine the radiant power leaving the enclosure through the aperture outside the aperture the environment is at 300 k. (let the disk be surface 1, the hemispherical enclosure is surface 2, and the aperture be surface 3)
Answers: 3
Physics, 22.06.2019 23:40
Along wire of diameter 1 mm is submerged in an oil bath of temperature ∞ 31°c. the wire has an electrical resistance per unit length of 0.01 ω/m. if a current of 103 a flows through the wire and the convection coefficient is 500 w/m2·k, what is the steady-state temperature of the wire? from the time the current is applied, how long does it take for the wire to reach a temperature that is within 1°c of the steady-state value? the properties of the wire are 8000 kg/m3, 500 j/kg·k, and 20 w/m·k.
Answers: 3
Physics, 23.06.2019 02:20
Ahole in the ground in the shape of an inverted cone is 14 meters deep and has radius at the top of 11 meters. the cone is filled to the top with sawdust. the density of the sawdust depends upon the depth, x, following the formula ρ ( x ) = 2.5 + 1.2 e − 0.7 x kg/m3. find the total mass of sawdust in the conical hole.
Answers: 1
Physics, 23.06.2019 06:00
What is offspring? why does a longer life span mean a higher chance of producing offspring?
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Physics, 23.06.2019 12:00
An 800 kg car is moving at 32 m/s. what magnitude force is needed to bring that car to a stop in 30 seconds?
Answers: 2
Problem 1: a small disk 5 mm in diameter is positioned and the center of an isothermal hemispherica...
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