The components of an electronic system dissipating 220  W are located in a 1 -m-long horizontal duct whose cross section is 16  cm ×16  cm. The components in the duct are cooled by forced air, which enters at 27^∘ C at a rate of 0.65  m^3 / min. Assuming 85 percent of the heat generated inside is transferred to air flowing through the duct and the remaining 15 percent is lost through the outer surfaces of the duct, determine (a) the exit temperature of air and (b) the highest component surface t
The components of an electronic system dissipating 220  W are loca…
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Why Steel Wool Burns But Steel Doesn’t Steel wool and solid steel are both primarily composed of iron, but their flammability differs due to physical structure. Steel wool consists of extremely fine filaments, dramatically increasing its surface-area-to-volume ratio. This allows for rapid oxidation, as more iron atoms are simultaneously exposed to oxygen. Additionally, the low thermal mass of each strand enables it to reach iron’s ignition temperature (~900°C) with minimal energy input, such as
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