The thermal conductivity of a certain concrete is 0.80 W/m ? K and the thermal conductivity of a certain wood is 0.10 W/m ? K
How thick would a solid concrete wall have to be in order to have the same rate of thermal energy flow through it as an 8.0-cm thick wall made of solid wood? Both walls have the same surface area and the same temperature difference across their faces. A) 53 cm
B) 64 cm
C) 71 cm
D) 85 cm
B
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The fundamental force that is the principal cause of what we experience as frictional forces is:
A. gravitational force B. electromagnetic force C. weak force D. strong force
For which of the following is the celestial sphere an accurate representation of reality?
A. the view of the stars from Earth B. the motion of the planets around Earth C. the spherical bubble that surrounds Earth D. the distance to the stars E. the motion of the Sun around Earth
What is the force that keeps a main sequence star from collapsing on itself?
A) Magnetism B) Gravitation C) The strong force D) Radiation pressure E) Electron degeneration pressure
Multiple planets have been identified around other stars via the transit technique
Indicate whether the statement is true or false