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## Homework Statement

How much time does it take to the sun to furnish an energy of 10 000 KWh on a surface of 31 700 m².

## Homework Equations

Stefan-Boltzman law ?

the power radiated from a black body = σ*T

^{4}

## The Attempt at a Solution

I don't know how I can find the time, I don't know any equation that depend on t to find it, if someone can explain me, that would be great !

Thank you !