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Your house foundation and basement floor are made up of 1000 ft3 of concrete. About how many Btu are required to raise the temperature of this mass from 0°C to 40°C? Given: 22 Btu/ft3⋅°F for concrete. 1,600,000 900,000 22,000 40,000 1,800 40 BONUS A flat-plate solar collector has a useful upper temperature limit of about _____°C ................
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