A) A tuning for oscilates with a frequency of 256 hertz after being struck by a rubber hammer. Which phrase best describes the produced by fork
A) electromagnetic waves that require a medium for transmission
B) mechanical waves that require no medium for transmission
electromagnetic waves that require no medium for transmission
D) mechanical waves that require a medium for transmission

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