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### Where Are Derivatives Used in Real Life?

```Date: 03/20/2007 at 08:50:31
From: Duygu
Subject: I have been trying to learn about daily usages of derivative

I want to learn about daily usages of derivatives, but I couldn't find
anything about it.  We learn this subject but we do not know where we
can use it.

```

```

Date: 03/22/2007 at 07:02:42
From: Doctor Susie
Subject: Re: I have been trying to learn about daily usages of derivative

Hi Duygu,

Derivatives are very important for lots of things especially in
Physics and Engineering. I use derivatives almost every day as an
engineer.

In my work, I study vibrations of underwater pipelines.  We are
largely worried about fatigue, where we are trying to figure out how
to build underwater pipelines so that they do not break.

We test a lot of pipes both in pools and in the ocean.  We often
measure strain when we are testing pipes; the strain is how much the
pipe stretches when it vibrates divided by the total length of the
pipe.  Sometimes these vibrations are so small that you can not see
them, but they can cause big damage to the pipe.

To calculate the fatigue, I need to know how much the pipe is curved.
It turns out that strain is the first derivative of curvature.  So I
can find the curvature and therefore I can solve for the fatigue, and
then I can tell you when your pipe is going to break.

This is just one example.  Derivatives are used all the time by
scientists, mathematicians, and engineers to solve all sorts of problems.

write back.

- Doctor Susie, The Math Forum
http://mathforum.org/dr.math/
```
Associated Topics:
High School Calculus

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