(a) To determine The expression for the work done in changing the spring's length from l 1 to l 2 . Explanation Express the relation between force and spring extension. F = k ( l − l 0 ) Here, spring extension is k , un-stretched length is l 0 and length is l . Write the expression of work done on the spring when it stretches by distance d l . δ W = − F d l = − k ( l − l 0 ) d l Here, force is F and differential length is d l . Conclusion: Express the work done in changing the spring's length from l 1 to l 2 . ∫ δ W = ∫ l 1 l 2 k ( l − l 0 ) d (b) To determine To evaluate: The work done on a spring:

Fundamentals of Engineering Thermodynamics

8th Edition

ISBN: 9781118832318

Author: MORAN

Publisher: WILEY

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Chapter 2.7, Problem 45P

(a)

To determine

The expression for the work done in changing the spring's length from l1 to l2.

(b)

To determine

To evaluate:

The work done on a spring:

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Chapter 2.7, Problem 44P

Chapter 2.7, Problem 46P

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Fundamentals of Engineering Thermodynamics

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