Physics for Scientists and Engineers, Vol. 1
6th Edition
ISBN: 9781429201322
Author: Paul A. Tipler, Gene Mosca
Publisher: Macmillan Higher Education
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Chapter 20, Problem 39P
To determine
To Show: The thermal current through the shell is given by
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(a) Taking into account the thermal expansion of the tungsten filament. You may assume a thermal expansion coefficient of 12×10−6 / ºC . (b) By what percentage does your answer differ ?
The thermal conductivity of a material depends only on the type of
and is a constant.
If a material is having low thermal conductivity then, the material is a good thermal
t of
Of the given materials, brass and steel,
is a better conductor, as its
value is higher.
Given a cylindrical Cu bar (length L = 4 m, radius, r = 2 cm). One end is kept in a heat
bath at 105 °C and the other temperature at 5 °C. The surface of the bar is insulated so
that there is negligible heat loss through it.
thermal conductivity of copper: kcu = 385 W/m K
Calculate the following up to three (3) significant figures:
(1) Thermal resistance Rth of the Cu bar, Ans =
(2) Conduction heat current HC, Ans =
(3) Temperature gradient AT/Ax, Ans =
(4) Temperature T of the Cu bar 0.5 m from the hot end, Ans
in W
in C/m
in K/W
in C
Chapter 20 Solutions
Physics for Scientists and Engineers, Vol. 1
Ch. 20 - Prob. 1PCh. 20 - Prob. 2PCh. 20 - Prob. 3PCh. 20 - Prob. 4PCh. 20 - Prob. 5PCh. 20 - Prob. 6PCh. 20 - Prob. 7PCh. 20 - Prob. 8PCh. 20 - Prob. 9PCh. 20 - Prob. 10P
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