Heat engine uses one mole of air in ideal state as the working fluid operates between 350 K and 600 K temperatures according to Carnot cycle. Initially, the pressure is 10 atm. After the isothermal expansion step, the pressure has been reduced to 5 atm and after the isothermal compression step, the pressure is 3 atm. Calculate the thermal efficiency of this engine and calculate the work done in each step in this cycle. Given that for air, the ratio (= 1.4).​

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