Chapter 16: Problem 18
The outdoor temperature rises by \(10^{\circ} \mathrm{C}\). What's that rise in Fahrenheit?
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Chapter 16: Problem 18
The outdoor temperature rises by \(10^{\circ} \mathrm{C}\). What's that rise in Fahrenheit?
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You arrive for a party on a night when it's \(8^{\circ} \mathrm{C}\) outside. Your hosts meet you at the door and say the party may need to be cancelled, because the heating system has failed and they don't want to discomfort their guests. You say, "Not so fast!" A total of 36 people are expected, the average power output of a human body is \(100 \mathrm{W},\) and the house loses energy at the rate \(320 \mathrm{W} / \mathrm{C} .\) Will the house remain comfortable?
The table below shows temperature versus time for \(500 \mathrm{g}\) of water heated in a microwave oven. In a microwave, essentially all the microwave energy goes into the water-containing food in the oven. Plot the data, determine a best-fit line, and use the slope of your line to determine the microwave power of this particular oven. Assume that water's specific heat is independent of temperature (which is only approximately true; see Problem 73 ). $$\begin{array}{|l|c|c|c|c|c|c|c|} \hline \text { Time (s) } & 0 & 25 & 60 & 95 & 125 & 160 & 190 \\ \hline \text { Temperature ('C) } & 12 & 20 & 39 & 53 & 64 & 83 & 93 \\ \hline \end{array}$$
Your niece from Problem 56 keeps her pet rabbit in a backyard hutch with thermal resistance \(0.25 \mathrm{K} / \mathrm{W}\). On a day when the outside temperature is \(-15^{\circ} \mathrm{C},\) she's worried that the rabbit's water will freeze, so you put a \(50-\) W heat lamp in the hutch. Will the bunny be able to drink its water? Neglect the heat due to the animal's metabolism.
Fiberglass insulation for attics is available in 12 -inch thickness. Its \(\mathcal{R}\) -factor is a. 38 b. 76 c. 29
If you put a thermometer in direct sunlight, what do you measure: the air temperature, the temperature of the Sun, or some other temperature?
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