Schaum's Outline of College Physics, Twelfth Edition (Schaum's Outlines)
Schaum's Outline of College Physics, Twelfth Edition (Schaum's Outlines)
12th Edition
ISBN: 9781259587399
Author: Eugene Hecht
Publisher: McGraw-Hill Education
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Chapter 18, Problem 39SP
To determine

The amount of water must evaporate each day if the person consumes 2500 cal of food and loses the heat equivalent through evaporation of water.

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The world's most active volcanoes, such as the Kilauea volcano in Hawaii, can disgorge about 5 ✕ 105 m3 of 1025°C lava per day. What is the rate of heat transfer out of the earth by convection if this lava has a density of 2523 kg/m3 and eventually cools to 32°C? Assume that the specific heat of lava is the same as that of granite (840 J/(kg · °C)).
At very low temperatures the molar heat capacity of rock salt varies with temperature according to Debye's T³ law: C = kT 03 where k = 1940 J/(mol K) and 0 = 281 K. (a) How much heat is required to raise the temperature of 1.50 mol of rock salt from 13.0 K to 36.0 K? (Hint: Use the change in thermal energy in the form dQ = nCdT and integrate.) (b) What is the average molar heat capacity in this range? (c) What is the true molar heat capacity at 36.0 K?
According to the USDA, an average, \moderately active" college student needs to eat 2500 calories per day. These \calories" are actually kilocalories, or kcal; and, we prefer to use Joules (J) in geophysics. The conversion is 1 kcal = 4187 J. The average geothermal heat ux is 60 mW/m2. How large an area on Earth's surface releases the same amount of energy in one day as used by the average college student in a day?
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