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Chapter 19: Q. 34 (page 544)
|| A 10 m14 m house is built on a 12-cm-thick concrete slab.
What is the heat-loss rate through the slab if the ground temperature
is 5C while the interior of the house is 22C?
The power needed is 15.9 kW
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The sun's intensity at the distance of the earth is . of this energy is reflected by water and clouds; is absorbed. What would be the earth's average temperature (in ) if the earth had no atmosphere? The emissivity of the surface is very close to 1 . (The actual average temperature of the earth, about , is higher than your calculation because of the greenhouse effect.)
You are boiling pasta and absentmindedly grab a copper stirring spoon rather than your wooden spoon. The copper spoon has a 20 mm 1.5 mm rectangular cross section, and the distance from the boiling water to your 35掳C hand is 18 cm. How long does it take the spoon to transfer 25 J of energy to your hand?
w
A cylinder with a movable piston contains moles of gas at a temperature higher than that of the surrounding environment. An external force on the piston keeps the pressure constant while the gas cools as , where is the temperature difference between the gas and the environment, is the initial temperature difference, and is the time constant.
a. Find an expression for the rate at which the environment does work on the gas. Recall that the rate of doing work is power.
b. What power is initially supplied by the environment if of gas are initially warmer than the surroundings and cool with a time constant of ?
Draw a first-law bar chart (see Figure 19.12) for the gas process in Figure EX19.9
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