Asap plz Which statement describes a controlled experiment? O A. It includes more than one control group.
B. It includes a control group and an experimental group.
C. It includes only an experimental group.
O D. It includes only a control group.

Aregion of space in which a measurable gravitational force is indicated by the force exerted on a test mass is called

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

What happens when you slowly pulled the carboard?