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Physics, 26.10.2020 20:20 boweytom6217
1. When solar energy heats the ground and warms the air above it, the warm air rises and cooler air moves in to replace it. This movement of air is known as
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Physics, 22.06.2019 04:40
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Asheet of steel 1.5 mm thick has nitrogen atmospheres on both sides at 1200oc and is permitted to achieve a steady-state diffusion condition. the diffusion coefficient for nitrogen in steel at this temperature is 6 x 10- 11 m2 /s, and the diffusion flux is found to be 1.2 x 10-7 kg/m2 -s. also, it is known that the concentration of nitrogen in the steel at the high-pressure surface is 4 kg/m3 . how far into the sheet from this high-pressure side will the concentration be 2.0 kg/m3 ? assume a linear concentration profile.
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By what primary heat transfer mechanism does the sun warm the earth?
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