Chapter 5.4, Problem 10E

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8th Edition

James Stewart

ISBN: 9781285740621

Textbook Problem

If the work required to stretch a spring 1 ft beyond its natural length is 12 ft-lb, how much work is needed to stretch it 9 in. beyond its natural length?

To determine

**To find:**

The work needed to stretch the spring beyond its natural length

Explanation

**1) Concept:**

Use Hookâ€™s law and formula of work done

**2) Law and Formula:**

Hookâ€™s law:

The force required to stretch a springÂ units beyond its natural length is proportional to

Work done:

**3) Calculation:**

From the given information,

Simplify,

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