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Relativity, centrifuge and deep space


Steph
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Your on a space ship which generates artificial gravity using a centrifugal wheel rotating relative to a central shaft.

 

Will it be neccessary to rotate the wheel relative to space or just the shaft relative to the wheel in order to generate artificial gravity.

 

I can make the moon go faster than the speed of light by pirouetting like a ballerina. Does relativity break down with angular distances?

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4 minutes ago, Steph said:

Your on a space ship which generates artificial gravity using a centrifugal wheel rotating relative to a central shaft.

 

Will it be neccessary to rotate the wheel relative to space or just the shaft relative to the wheel in order to generate artificial gravity.

 

To the shaft. It is centrifugal force causing outward force it mimics gravity.

 

4 minutes ago, Steph said:

I can make the moon go faster than the speed of light by pirouetting like a ballerina. Does relativity break down with angular distances?

 

No.

 

Laser smashes light-speed record – Physics World

 

 

 

 

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7 hours ago, Steph said:

Your on a space ship which generates artificial gravity using a centrifugal wheel rotating relative to a central shaft.

 

Will it be neccessary to rotate the wheel relative to space or just the shaft relative to the wheel in order to generate artificial gravity.

 

I can make the moon go faster than the speed of light by pirouetting like a ballerina. Does relativity break down with angular distances?

 

You could just have  whats in effect the rim of a wheel and rotate that to create a centripital force. - See also IIRC The Icarus space craft

 

If you want 1G then your diamitor has to be quite large in order to keep below 2 rpm a which point spin becomes noticable . 

2rpm is considered the tolerable limit for most people - theres some who can go higher but you are seriously limiting your pool of candidates.

 

On a space craft you would face the problem that accelleration / deceleration would create G force in the wrong direction* - If tyu were accelleating constantly / for a long time you may need to angle the rotating section to compensate. (and slow down by reversing)

 

 

*As it does on earth 

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1 hour ago, Steph said:

You could aim a flat plane with the normal pointing up to the destination planet. Move the plane toward it accelerating at 1G then flip the plane midway and decelarate at 1G.

 

Yes - negating the need for a rotating section.

Upside smaller ship

Downside - 1) its not as viable for a generation ship owing to the need to flip (cows goat tractors bouncing etc). 

 

 

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