. i. A conductor transfers heat of 1550 J across its length of 20 cm in 6 seconds. Given that its cross-sectional area A is 55cm2. Determine the thermal conductivity of the material if the temperature difference across the ends is 77oC?
. i. A conductor transfers heat of 1550 J across its length of 20 cm in 6 seconds. Given that its cross-sectional area A is 55cm2. Determine the thermal conductivity of the material if the temperature difference across the ends is 77oC?
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3). i. A conductor transfers heat of 1550 J across its length of 20 cm in 6 seconds. Given that its cross-sectional area A is 55cm2. Determine the thermal conductivity of the material if the temperature difference across the ends is 77oC?
ii. An object of emissivity 0.7 and cross-sectional area 55mm2 at room temperature of 30o losses energy at a rate of 35.6 J /s. What is the initial temperature of the object? [ hint; stefan’s constant = 5.6703 x10- 8W/m/K4 ]
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