Why do areas north of the artic circle in tje northern hemisphere experience a polar day lasting for several months during summer? a) the region does not experience spin during polar day b) earth is at its closest point to the sun during polar day c) the regioin is titled towqrd the sun during polar day d) earth's orbit passes below the sun during polar day

The earth exerts a gravitational force of 500 n on amy. what is amy’s mass in kg?

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

The energy equivalent of the rest mass of an electron is