Ex. 80 : A copper sphere of diameter 20 cm is coated with lampblack and maintained at a temperature at 127°C. Calculate the heat radiated by it in 1 minute. If the thermal capacity of the sphere is 4 × 10 2 kcal / K calculate the fall in temperature o = 1.36 × 10-" kcal / m? / k*.
Ex. 80 : A copper sphere of diameter 20 cm is coated with lampblack and maintained at a temperature at 127°C. Calculate the heat radiated by it in 1 minute. If the thermal capacity of the sphere is 4 × 10 2 kcal / K calculate the fall in temperature o = 1.36 × 10-" kcal / m? / k*.
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Transcribed Image Text:Ex. 80 : A copper sphere of diameter 20 cm is
coated with lampblack and maintained at a
temperature at 127°C. Calculate the heat
radiated by it in 1 minute. If the thermal
capacity of the sphere is 4 × 10- 2 kcal / K
calculate the fall in temperature o = 1.36 × 10-"
kcal / m2 / k*.
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