Calculating G-Force in Space: How Many KPH?

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Discussion Overview

The discussion centers around the concept of g-force in space, specifically the claim that a spaceship can reach 5,100g and the inquiry into how this acceleration translates into kilometers per hour. Participants explore the relationship between acceleration and velocity, as well as the implications of high g-forces on the human body.

Discussion Character

  • Technical explanation
  • Conceptual clarification
  • Debate/contested

Main Points Raised

  • One participant questions how to convert 5,100g into kilometers per hour, noting that g-force is felt during acceleration and suggesting that acceleration decreases as speed increases.
  • Another participant clarifies that g is a measure of acceleration and cannot be directly converted into a unit of velocity like kilometers per hour.
  • A participant calculates that 5,100g corresponds to an acceleration of 50,000m/s/s, equating to 50km/s/s.
  • There is a request for clarification on the concept of meters per second per second, with a participant seeking examples of how acceleration relates to speed over time.
  • One participant explains that if you accelerate at 1m/s/s for 10 seconds, your speed would be 10m/s, illustrating the relationship between acceleration and speed.
  • A later reply discusses the extreme effects of high g-forces on the human body, emphasizing that 5,100g would be lethal and referencing the limitations of current technology to mitigate such forces.

Areas of Agreement / Disagreement

Participants generally agree on the definition of g-force as an acceleration measure, but there is disagreement on the conversion of g-force to velocity, with some asserting it cannot be done while others explore the implications of high g-forces.

Contextual Notes

There are unresolved aspects regarding the conversion of acceleration to velocity, and the discussion does not reach a consensus on how to interpret the relationship between g-force and speed in practical terms.

Who May Find This Useful

This discussion may be of interest to individuals exploring concepts of acceleration, g-forces, and their implications in space travel, as well as those curious about the effects of extreme acceleration on the human body.

ledopmi
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I read that a spaceship can reach 5,100g in space. Is there a way to determine how many kilometers per hour this would be? As I understand it, the only way to feel g force is to be accelerating. The acceleration should slow down as speed increases and eventually stop so there would be 0g at that point.

I saw somewhere that 5,100g would be equal to 51,000kph but there was no explanation as to how the anwer was calculated.
 
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The g is an acceleration (the acceleration due to gravity felt on the surface of the earth). Therefore, 5100g is an acceleration and so, no, it cannot be converted into kilometres per hour, since this is a unit of velocity.
 
Since 1g is 9.8m/s/s, 5100g is 50,000m/s/s or 50km/s/s.
 
OK thanks. Can you explain the meters per second per second to me. I searched the web and found formulas but no examples.
Meters divided by time divided by time again. Can you give me an example of this formula with actual numbers?
 
That's the units of acceleration. If you accelerate at 1m/s/s for 10 seconds, you'll be going 10m/s. speed = acceleration * time.
 
Thank you.:smile:
 
Now that you know what a g is, also know that 5,100g would crush pretty much anything experiencing that magnitude of acceleration.

Check out this article on the effects of acceleration on the human body:
http://quest.nasa.gov/saturn/qa/new/Effects_of_speed_and_acceleration_on_the_body.txt

Even prolonged exposure to 3g's can cause serious health problems.

Prolonged exposure to 10gs would kill a person, even in a pressures suit.

Even if inertial dampeners, a device that would somehow less the effects of acceleration and currently only science fiction, were used, I doubt they would be able to compensate for 5,100 times Earth gravity.
 
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