A concrete floor (5'x10'x4''thick) is exposed to the sun during the day (@90oF). Compute the amount of

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Question:

A concrete floor (5'x10'x4''thick) is exposed to the sun during the day (@90oF). Compute the amount of heat that is stored and released by the floor on a daily basis if it cools to a temperature of 75 oF overnight? Hint: Specific heat of concrete = 0.156 Btu per IboF; Density of concrete = 144 Ib/ft3 . Provide your answer to the nearest whole number