Mr. Smith has a light bulb and a battery. He wants to light up the light bulb, but he needs one more component. What is the
item needed?
a. Power Source
b. Resistor or Load
C. Conductive Wires
d. A switch

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 planet do you think would be easiest for humans to colonize some day?

The three classes of rocks are sedimentary, metamorphic, and igneous. how are rocks classified into one of these three groups?