Four coplanar vectors act at a point. A 20.0N vector is directed 20° to the positive x-axis, a 50.0N vector acts at -30°, a 40.0N vector acts at 150° and the fourth vector is directed at 250°. Obtain the value of the equilibrrant vector( a single vector that cancels the combine effect of the above vectors).​

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