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A Thermos for Liquid Helium. A physicist uses a

University Physics | 13th Edition | ISBN: 9780321675460 | Authors: Hugh D. Young, Roger A. Freedman ISBN: 9780321675460 31

Solution for problem 115P Chapter 17

University Physics | 13th Edition

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University Physics | 13th Edition | ISBN: 9780321675460 | Authors: Hugh D. Young, Roger A. Freedman

University Physics | 13th Edition

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Problem 115P

A Thermos for Liquid Helium. A physicist uses a cylindrical metal can 0.250 m high and 0.090 m in diameter to store liquid helium at 4.22 K; at that temperature the heat of vaporization of helium is 2.09 X 104 J/kg. Completely surrounding the metal can are walls maintained at the temperature of liquid nitrogen, 77.3 K, with vacuum between the can and the surrounding walls. How much helium is lost per hour? The emissivity of the metal can is 0.200. The only heat transfer between the metal can and the surrounding walls is by radiation.

Step-by-Step Solution:
Step 1 of 3

Solution 115P The rate of radiation of heat is given by dQ = A(T 4 T 4) dt 1 2 Here the area of the container is 2 (0.090 m) A = 2( d ) + dh = 2( ) + (0.090 m)(0.250 m) = 0.083 m 2 4 4 Therefore the rate of energy radiation is dQ 2 8 2 4 4 4 2 dt = (0.083 m )(0.200)(5.67 × 10...

Step 2 of 3

Chapter 17, Problem 115P is Solved
Step 3 of 3

Textbook: University Physics
Edition: 13
Author: Hugh D. Young, Roger A. Freedman
ISBN: 9780321675460

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