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Chapter 16: Problem 16
A Canadian meteorologist predicts an overnight low of \(-15^{\circ} \mathrm{C}\) How would a U.S. meteorologist express that prediction?
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Fiberglass insulation for attics is available in 12 -inch thickness. Its \(\mathcal{R}\) -factor is a. 38 b. 76 c. 29
You're arguing with your roommate about whether it's quicker to heat water on a stove burner or in a microwave. The burner supplies energy at the rate of \(1.0 \mathrm{kW}\), the microwave at \(625 \mathrm{W}\). You can heat water in the microwave in a paper cup of negligible heat capacity, but the stove requires a pan with heat capacity \(1.4 \mathrm{kJ} / \mathrm{K}\) How much water do you need before it becomes quicker to heat on the stovetop? Neglect energy loss to the surroundings.
Does a thermometer measure its own temperature or the temperature of its surroundings? Explain.
You're having your home's heating system replaced, and the heating contractor has specified a new system that supplies energy at the maximum rate of \(40 \mathrm{kW}\). You know that your house loses energy at the rate of \(1.3 \mathrm{kW}\) per \(^{\circ} \mathrm{C}\) temperature difference between interior and exterior, and the minimum winter temperature in your area is \(-15^{\circ} \mathrm{C}\). You'd like to maintain \(20^{\circ} \mathrm{C}\left(68^{\circ} \mathrm{F}\right)\) indoors. Should you go with the system your contractor recommends?
After a calm, cold night, the temperature a few feet above ground often drops just as the Sun comes up. Explain in terms of convection.
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