*15. GO A pot of water is boiling under one atmosphere of pressure. As-sume that heat enters the pot only through its bottom, which is copperand rests on a heating element. In two minutes, the mass of water boiledaway is m = 0.45 kg. The radius of the pot bottom is R = 6.5 cm, andthe thickness is L = 2.0 mm. What is the temperature Tg of the heatingelement in contact with the pot?

The heat transferred is given by, Q=κA∆TtL where κ= thermal conductivity, A= area, T=temperature,…

Answered: *15. GO A pot of water is boiling under…

Principles of Physics: A Calculus-Based Text

5th Edition

ISBN:9781133104261

Author:Raymond A. Serway, John W. Jewett

Publisher:Raymond A. Serway, John W. Jewett

Chapter17: Energy In Thermal Processes: The First Law Of Thermodynamics

Section: Chapter Questions

Problem 10P

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An aluminum rod 0.500 m in length and with a cross sectional area of 2.50 cm2 is inserted into a thermally insulated vessel containing liquid helium at 4.20 K. The rod is initially at 3(H) K. (a) If one-halt of the rod is inserted into the helium, how many liters of helium boil off by the time the inserted half cools to 4.20 K? Assume the upper half does not yet cool, (b) If the circular surface of the upper end of the rod is maintained at 300 K. what is the approximate boil-off rate of liquid helium in liters per second after the lower half has reached 4.20 K? (Aluminum has thermal conductivity of 3 100 YV/m K at 4.20 K; ignore its temperature variation. The density of liquid helium is 125 kg/m3.)
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