Please help me Differentiate between the distance and displacement for an object that started at point A and traveled as shown to point B.

Distance: _ units and Displace: _ units to the left.

Describe the path of a ray that approaches a mirror parallel to the principal axis.

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

Which substance partical has negligible massand travels around outsidethe nucleus