Chapter 14: Q21Q (page 390)
Explain why air temperature readings are always taken with the thermometer in the shade.
In the presence of direct sunlight, the thermometer's reading is higher than the normal air temperature.
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If you hear that an object has “high heat content,” does that mean that its temperature is high? Explain.
(II) A 100-W light bulb generates 95 W of heat, which is dissipated through a glass bulb that has a radius of 3.0 cm and is 0.50 mm thick. What is the difference in temperature between the inner and outer surfaces of the glass?
Why does water in a metal canteen stay cooler if the cloth jacket surrounding the canteen is kept moist?
In warm regions where tropical plants grow but the temperature may drop below freezing a few times in the winter, the destruction of sensitive plants due to freezing can be reduced by watering them in the evening. Explain.
(a) If two objects of different temperatures are placed in contact, will heat naturally flow from the object with higher internal energy to the object with lower internal energy? (b) Is it possible for heat to flow even if the internal energies of the two objects are the same? Explain.
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