Imagine an ideal (Carnot) refrigerator that keeps soda bottles chilled to a temperature of about 280 KK. The refrigerator is located in a hot room with a temperature of about 300 KK. Because of the imperfect insulation, 5.00 JJ of heat is absorbed by the refrigerator each hour. How much electrical energy EEE must be used by the refrigerator to maintain the temperature of 280 KK inside for one hour?

How to calculate voltage drop in a series circuit

Acarpenter builds an exterior house wall with a layer of wood 2.9 cm thick on the outside and a layer of styrofoam insulation 2.3 cm thick on the inside wall surface. the wood has k=0.080w/(m⋅k), and the styrofoam has k= 0.010 w/(m⋅k). the interior surface temperature is 19.0 ∘c , and the exterior surface temperature is -15.0 ∘c . a.)what is the temperature at the plane where the wood meets the styrofoam? celsius b.)what is the rate of heat flow per square meter through this wall? /m^2

Acopper sheet has a volume of 100 cm³. if the density of copper is 8.9 g/cm³, what is the mass of the sheet? a. 11 g b. 8.9 g c. 189 g d. 890 g