Chapter 14: Q9Q (page 390)
Will pasta cook faster if the water boils more vigorously? Explain.
No, the pasta will not cook faster if the water boils more vigorously.
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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.
An “emergency blanket” is a thin shiny (metal-coated) plastic foil. Explain how it can help to keep an immobile person warm.
A house thermostat is normally set to 22°C, but at night it is turned down to 16°C for 9.0 h. Estimate how much more heat would be needed (state as a percentage of daily usage) if the thermostat were not turned down at night. Assume that the outside temperature averages 0°C for the 9.0 h at night and 8°C for the remainder of the day, and that the heat loss from the house is proportional to the temperature difference inside and out. To obtain an estimate from the data, you must make other simplifying assumptions; state what these are.
When hot-air furnaces are used to heat a house, why is it important that there be a vent for air to return to the furnace? What happens if this vent is blocked by a bookcase?
After a hot shower and dishwashing, there seems to be no hot water left in the 65-gal (245-L) water heater. This suggests that the tank has emptied and refilled with water at roughly 10°C. (a) How much energy does it take to reheat the water to 45°C? (b) How long would it take if the heater output is 9500 W?
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