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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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(II) A 64-kg ice-skater moving at 7.5 m/s glides to a stop. Assuming the ice to be at 0掳C and that 50% of the heat generated by friction is absorbed by the ice, how much ice melts?
(II) Determine the latent heat of fusion of mercury using the following calorimeter data: 1.00 kg of solid Hg at its melting point of \({\bf{ - 39}}{\bf{.0\circ C}}\) is placed in a 0.620-kg aluminum calorimeter with 0.400 kg of water at 12.80掳C; the resulting equilibrium temperature is 5.06掳C.
The specific heat of water is quite large. Explain why this fact makes water particularly good for heating systems (that is, hot-water radiators).
For objects at thermal equilibrium, which of the following is true?
(a) Each is at the same temperature.
(b) Each has the same internal energy.
(c) Each has the same heat.
(d) All of the above.
(e) None of the above.
(II) An iron boiler of mass 180 kg contains 730 kg of water at 18掳C. A heater supplies energy at the rate of 58,000 kJ/h. How long does it take for the water (a) to reach the boiling point and (b) to all have changed to steam?
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