the diagram is being used to illustrate the second law of thermodynamics, where qh  represents a hot object and qcrepresents a cold object. which will  best  complete the diagram to illustrate the law? adding in the boxes an arrow that points from qh  to qcadding in the boxes an arrow that points from  qc  to  qhadding in the boxes an arrow that points in both directions between  qh  and  qcadding in each box an arrow that points upward fromqh  and from  qc

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