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Chapter 14: Q13Q (page 390)
If you hear that an object has “high heat content,” does that mean that its temperature is high? Explain.
No, the object that has high heat content does not need to have a high temperature.
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When you put an ice cube in a glass of warm tea, which of the following happens?
(a) Cold flows from the ice cube into the tea.
(b) Cold flows from the ice cube into the tea and heat flows from the tea into the ice cube.
(c) Heat flows from the tea into the ice cube.
(d) Neither heat nor cold flows. Only temperature flows between the ice and the tea.
A mountain climber wears a goose-down jacket 3.5 cm thick with total surface area \({\bf{0}}{\bf{.95}}\;{{\bf{m}}{\bf{2}}}\). The temperature at the surface of the clothing is \( - {\bf{1}}{{\bf{8}}{\bf{o}}}{\bf{C}}\) and at the skin is 34°C. Determine the rate of heat flow by conduction through the jacket assuming (a) it is dry and the thermal conductivity k is that of goose down, and (b) the jacket is wet, so k is that of water and the jacket has matted to 0.50 cm thickness.
The floor of a house on a foundation under which the air can flow is often cooler than a floor that rests directly on the ground (such as a concrete slab foundation). Explain.
A paper cup placed among hot coals will burn if empty (note burn spots at top of cup in Fig. 14–14), but won’t burn if filled with water. Explain. Forget the marshmallows.
FIGURE 14-14 Question 29.
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