Now suppose that all of the hydrogen atoms in the sun were converted into helium. how much total energy would be produced? (to calculate the answer, you will have to estimate how many hydrogen atoms are in the sun. this will give you good practice with scientific notation, since the numbers involved are very large! see appendix c for a review of scientific notation.)

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