power radiated
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Transcribed Image Text:Which of the following statements is false?
No heat engine can be more efficient than a Carnot engine working between the same
reservoirs.
The change in thermal energy of a heat engine that has completed one cycle is zero.
Heat can flow spontaneously from a hot reservoir to a cold one.
The entropy of an isolated system must decrease with time.
Question 23
4 pts
On a hot summer's day, you will feel cooler if you wear a light-colored shirt rather
than a dark-colored one. This is due to the difference in the objects'
densities.
emissivities.
thermal conductivities.
Question 24
4 pts
The thermal conductivity of concrete is 0.80 W/(m K), and the thermal conductivity
of a certain type of wood is 0.10 W/(m K). How thick would a solid concrete wall
have to be to have the same rate of heat flow as an 8.0-cm-thick solid wall of this
wood? Both walls have the same surface area and the same interior and exterior
temperatures.
16 cm
32 cm
64 cm
O 1.0 cm
Question 25
4 pts
If the absolute temperature of an object is doubled, the thermal power radiated by
this object (assuming that its emissivity and size are not affected by the
temperature change) will increase by a factor of
6
8
4
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