PHYSICS F/SCI.+ENGRS.,STAND.-W/ACCESS
PHYSICS F/SCI.+ENGRS.,STAND.-W/ACCESS
6th Edition
ISBN: 9781429206099
Author: Tipler
Publisher: MAC HIGHER
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Chapter 20, Problem 56P
To determine

To Estimate: The thermal resistance of the rod.

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For the heat resistance of a material, it must be made in a certain thickness. In other words, as the temperature to be tolerated increases, the required thickness increases. This increase has two components. Exponential and linear. You can assume the coefficient of the exponential part as one, keeping only the parameter in exponential variable. Using the temperature and thickness values given below, find out how much thịckness is reguired for 100 degrees. Нeat Thickness 50 200 50 60 250
1.5. The resistance of a platinum wire is found to be 11.000 SN at the ice point, 15.247 N at the steam point, and 28.887 N at the sulfur point. Find the constants a and b in the equation R' = R(1+ a@ + be²), and plot R' against Celsius temperature 0 in the range from 0 to 660°C.
The filament in a light bulb has a diameter of 0.02 mm and an emissivity of 1.0. The temperature of the filament is 3×1000°C. What should be the length of the filament in meters so it will radiate 60 W of power? The Stefan-Boltzmann constant is 5.670 × 10-8 W/m2 · K4. Please give your answer with 3 decimal places.
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