The sun shines on a 300-ft2 south-facing wall, maintaining that surface at 98°f. temperature varies linearly through the wall and is 77°f at its other surface. the wall thickness is 6 inches and its thermal conductivity is 0.04 btu/h · ft °r. assuming steady state, determine the rate of exergy destruction within the wall, in btu/h. let t0 = 77°f.

Arotating space station is said to create “artificial gravity”—a loosely-defined term used for an acceleration that would be crudely similar to gravity. the outer wall of the rotating space station would become a floor for the astronauts, and centripetal acceleration supplied by the floor would allow astronauts to exercise and maintain muscle and bone strength more naturally than in non-rotating space environments. if the space station is 200 m in diameter, what angular velocity would produce an “artificial gravity” of 9.80 m/s^{2} 2 at the rim?

In a system, when potential energy decreases, then entropy also decreases. true false

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