Centrifugal speed (MPH) converted to G's

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    Centrifugal Speed
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Discussion Overview

The discussion revolves around calculating the G-force exerted on a person weighing 100 lbs when subjected to centrifugal motion at different speeds (1,000 MPH and 500 MPH). Participants explore the necessary parameters for such calculations, including the radius of motion and the conversion of speed units.

Discussion Character

  • Technical explanation
  • Mathematical reasoning
  • Debate/contested

Main Points Raised

  • One participant questions the validity of expressing rotational speed in miles per hour, suggesting that a different unit may be more appropriate.
  • Another participant emphasizes the need to know the radius of motion to calculate G-force accurately.
  • Some participants suggest using the formula F = mv²/r for calculating G-force, while also noting the importance of consistent units.
  • A participant raises a related question about the effect of Earth's rotation on weight at the equator compared to the poles, introducing the concept of centripetal acceleration.

Areas of Agreement / Disagreement

Participants generally agree on the need for additional parameters (like radius) to perform the calculations, but there is no consensus on how to proceed with the calculations or the appropriateness of the speed units used.

Contextual Notes

Some participants express uncertainty about converting speed to G-force and the implications of using different units. There are also references to external resources for further clarification, indicating a reliance on external definitions and formulas.

Who May Find This Useful

This discussion may be useful for individuals interested in physics, particularly those exploring concepts of rotational motion, G-forces, and the effects of centrifugal acceleration.

F Mills
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HI, let's save introductions till later, I'd like to get right to it.

two questions:

If a person weighs 100 lbs and is on a centrifuge spinning at 1,000 MPH, what is the G-force exerted by his body?
If a person weighs 100 lbs and is on a centrifuge spinning at 500 MPH, what is the G-force exerted by his body?

thanks in advance
 
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F Mills said:
spinning at 1,000 MPH

You can't spin in "miles per hour".
 
CWatters said:
You can't spin in "miles per hour".

Yeah, that's the problem I'm getting when googling speed to G force calculators, can you do some conversions and come up with an answer, it's over my head.
 
F Mills said:
Yeah, that's the problem I'm getting when googling speed to G force calculators, can you do some conversions and come up with an answer, it's over my head.

Welcome to the PF.

See the wikipedia page: https://en.wikipedia.org/wiki/Centripetal_force

And use F = mv^2/r. Be sure to keep your units consistent (like meters, kilograms and seconds).

What is the context of your question? Going to be flying a fighter jet soon and want to know what to expect? :smile:
 
Buzz Bloom said:
Hi F Mills:

You need to also know the radius of motion. How far from the axis of rotation are you?

See https://en.wikipedia.org/wiki/Circular_orbit .

Regards,
Buzz

3,959 miles (6,371 kilometers) one revolution per 23 hours 56 minutes and 4 seconds.
 
berkeman said:
Welcome to the PF.

See the wikipedia page: https://en.wikipedia.org/wiki/Centripetal_force

And use F = mv^2/r. Be sure to keep your units consistent (like meters, kilograms and seconds).

What is the context of your question? Going to be flying a fighter jet soon and want to know what to expect? :smile:

Calculating g force applied to 100 lb person on the equator of earth.
 
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