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An old lightbulb draws only 50.0 W, rather than its

College Physics | 1st Edition | ISBN: 9781938168000 | Authors: Paul Peter Urone, Roger Hinrichs ISBN: 9781938168000 42

Solution for problem 57PE Chapter 20

College Physics | 1st Edition

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College Physics | 1st Edition | ISBN: 9781938168000 | Authors: Paul Peter Urone, Roger Hinrichs

College Physics | 1st Edition

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Problem 57PE

Problem 57PE

An old lightbulb draws only 50.0 W, rather than its original 60.0 W, due to evaporative thinning of its filament. By what factor is its diameter reduced, assuming uniform thinning along its length? Neglect any effects caused by temperature differences.

Step-by-Step Solution:
Step 1 of 3

Solution 57PE

The final diameter or radius becomes 0.91 times the initial diameter. So it is reduced by,

Reduction in diameter = (1-0.912) 100%

                           = 8.8%

Hence, the final diameter is reduced by 8.8 %

Step 2 of 3

Chapter 20, Problem 57PE is Solved
Step 3 of 3

Textbook: College Physics
Edition: 1
Author: Paul Peter Urone, Roger Hinrichs
ISBN: 9781938168000

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An old lightbulb draws only 50.0 W, rather than its