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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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Using the result of part (a) in Problem 65, take into account radiation from the leaf to calculate how much water must be transpired (evaporated) by the leaf per hour to maintain a temperature of 35°C.
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.
(II) What mass of steam at 100°C must be added to 1.00 kg of ice at 0°C to yield liquid water at 30°C?
The temperature of the glass surface of a 75-W lightbulb is 75°C when the room temperature is 18°C. Estimate the temperature of a 150-W lightbulb with a glass bulb the same size. Consider only radiation, and assume that 90% of the energy is emitted as heat.
To get an idea of how much thermal energy is contained in the world’s oceans, estimate the heat liberated when a cube of ocean water, 1 km on each side, is cooled by 1 K. (Approximate the ocean water as pure water for this estimate.)
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