What is the best method for electromagnetic propulsion?

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Discussion Overview

The discussion revolves around identifying the most efficient method for electromagnetic propulsion to lift a weight using a pulley system. Participants explore various propulsion methods and their energy requirements in different contexts, including practical applications and theoretical considerations.

Discussion Character

  • Exploratory
  • Technical explanation
  • Debate/contested
  • Mathematical reasoning

Main Points Raised

  • One participant defines "best" as the method that uses the least energy to produce the greatest force for lifting weights.
  • Another participant emphasizes the need for specific details regarding forces and weights, noting that propulsion methods may not scale effectively across different applications.
  • Multiple participants suggest that the context of propulsion—such as space probes, race cars, or particle accelerators—affects the choice of method.
  • One participant proposes using an electric motor to wind the string around a shaft, questioning if this qualifies as electromagnetic propulsion.
  • Another participant calculates the energy required to lift the weight, providing a formula and suggesting that power requirements depend on the desired lifting speed.
  • Several participants agree that an ordinary electric motor is a suitable option for the described scenario, with calculations provided for energy requirements.

Areas of Agreement / Disagreement

There is no consensus on a single best method for electromagnetic propulsion, as participants present various approaches and emphasize different contexts. Some agree on the use of electric motors, while others highlight the importance of application-specific details.

Contextual Notes

Participants mention the influence of friction in calculations and the need for clarity in the problem statement, indicating that assumptions about the system's parameters are not fully resolved.

Sameh soliman
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I mean by the best the one that use the least energy to produce the grater force capable of carrying weights .

Say you have a pulley attached to a ceiling with height of 3 meters, around the pulley is a string that attached to a 30 kg weight and on the other side of the string you want to use electromagnetic propulsion to lift the weight up ... What method will you use and how much power will it use ?
 
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You would need to specify what sort of forces and weights are involved. Things like this don't easily scale for different sizes - take a slot racing car and a F1 style electric car. An electromagnetic engine that's suitable for one purpose may be hopeless for another purpose.
 
Sameh soliman said:
I mean by the best the one that use the least energy to produce the grater force capable of carrying weights .
As long as you can run tracks where you want to go...

https://en.wikipedia.org/wiki/Maglev

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We need more detail to answer.

To propel a space probe, an ion thruster is used.

To propel a race car, an electric motor is used.

To propel protons in an accelerator, magnets are used.

Edit: Are you working on a SF story?
 
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anorlunda said:
We need more detail to answer.

To propel a space probe, an ion thruster is used.

To propel a race car, an electric motor is used.

To propel protons in an accelerator, magnets are used.

Edit: Are you working on a SF story?

OK... I wasn't clear at all

Say you have a pulley attached to a ceiling with height of 3 meters, around the pulley is a string that attached to a 30 kg weight and on the other side of the string you want to use electromagnetic propulsion to lift the weight up ... What method will you use and how much power will it use ?
 
How about winding the string around the shaft of an electric motor? Does an electric motor qualify as "electromagnetic propulsion"?
 
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Sameh soliman said:
Say you have a pulley attached to a ceiling with height of 3 meters, around the pulley is a string that attached to a 30 kg weight and on the other side of the string you want to use electromagnetic propulsion to lift the weight up ... What method will you use and how much power will it use ?
I would use an electric motor. Power requirements depend on how fast you want it raised. The formula is P=mgh/t and you will want to make it larger to account for friction in the pulley

Edit: beat by @phyzguy !
 
An ordinary electric motor is the best option.

It will take 3*30 kg*m or 883 n*m or 883 joules of energy to lift neglecting friction.

Can you do the rest? Do you know what a joule is? a watt?
 
anorlunda said:
An ordinary electric motor is the best option.

It will take 3*30 kg*m or 883 n*m or 883 joules of energy to lift neglecting friction.

Can you do the rest? Do you know what a joule is? a watt?
That will do it ... Thanks
 
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