Application of cubic formula

[graygoosetwelve]

I am trying to help a friend out. She needs to solve the formula ax^3 + bx^2 + cx + d = 0. We can not find a problem using a real life application to solve. We will be able to solve the problem, just can't find one. Any help?

[sovereignstar]

Have you tried Google yet?
:)

[graygoosetwelve]

For hours. It is not easy to find a real life application.

[MikeVic]

I don't think calculus can be used in real-life applications? ;)

[Pyser]

just watch Numb3rs. I'm sure that'll answer it.

[TLK]

wrong time of the day for this.... bump this thread at about 9:00am, and they'll have an answer for you by about 9:06am....

[sovereignstar]

wrong time of the day for this.... bump this thread at about 9:00am, and they'll have an answer for you by about 9:06am....

So true.

[RPI-Fan]

You can model the jerk of a motor vehicle with that formula... limitless general engineering applications, too.

[Yossarian]

42?

[Mr. Wednesday]

A cubic equation of state for thermodynamic fluid modeling? I'm a little fuzzier than I should be on how those are set up, it's just something that comes to mind that could work and if so is definitely a real-life application.

[Mr. Wednesday]

Dola, also, you might be able to find an example of data where it makes sense to fit it with a cubic equation over a limited domain even if the overall problem doesn't really fit as a cubic system.

[Huckleberry]

Change in outer diameter of an o-ring when stretched.

Given: original inner diameter, original cross-sectional diameter.

Assuming a constant volume, find the new outer diameter after the o-ring is stretched to fit over tubing (i.e., the new inner diameter is given).

This application is actually the reason I wrote a little cubic solver for Excel.

[JeeberD]

42?

No, 2/3...