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A sphere of 25mm diameter contains an embedded electrical heater. Calculate the power required to maintain the surface temperature at 94C when the sphere is

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A sphere of 25mm diameter contains an embedded electrical heater. Calculate the power required to maintain the surface temperature at 94C when the sphere is exposed to a quiescent medium at 20C for: (a) air at atmospheric pressure, (b) water, and (c) ethylene glycol

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