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A pin (qindinial) fin has a diameter of 4mm, a length of 5cm, and a thermal conductivity of 200W/mK. if the heat transfer coefficient is

A pin (qindinial) fin has a diameter of 4mm, a length of 5cm, and a thermal conductivity of 200W/mK. if the heat transfer coefficient is 70W/m2K, with a surface temperature of 50C and an air temperature of

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