Be sure to organize your topics into separate discussions.

a. birth, life, and death of a main sequence star
b. supergiants
c. supernova
d. neutron star
e. pulsar

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

Definition: this is the weighted average of all of the isotopes of an element.

Which of the following is most likely to be the best conductor of electricity? oxygen chlorine aluminum chromium