Aphone cord is 2.85 m long. the cord has a mass of 0.254 kg. a transverse wave pulse is produced by plucking one end of the tautcord. the pulse makes four trips down and back along the cord in 0.758 s. what is the tension in the cord? answer in units of n.

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