Question 11 (1 point) A 520 N skateboarder runs east with a speed of 4.5 m/s toward her 5.0 kg skateboard that is moving 6.0
m/s west, and jumps on. What is the final speed and direction of the skateboarder on the board?

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