Two cars are sitting still. car a has a mass of 2000 kilograms. car b has a mass of 4000 kg. if the goal is to push both cars to roll at the same speed, describe the force it will take to get car b to that speed? (assume everything else is equal: friction & steepness of the road, time, person pushing, etc.)

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