How many kwh of heat energy were added to the slab, Other Subject

How many kwh of heat energy were added to the slab

Problem

A house is built with a concrete slab and a big south facing window. At 100m2 and 0.1m thick, the slab has a volume of 10m³ and thus a mass of 24,000 kg. At 6:00 AM, the temperature of the slab is 16^oC. The sun shines in through the window and by 2:00 PM the slab temperature is 36.2^oC. Concrete has a specific heat of 960 J/kg K. We know that one Joule (J) is equal to 1 Watt-second (W sec). We also know that there are 3600 second in an hour. How many kWh of heat energy were added to the slab?

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