Serious Light Speed Discussion

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pErvinalia
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Re: Serious Light Speed Discussion

Post by pErvinalia » Fri Mar 16, 2018 1:16 am

mistermack wrote:
cronus wrote:
mistermack wrote:Large objects that attain speeds approaching that of light will have had nearly infinite energy put into them to get to that point.
There is no mechanism in the Universe capable of doing that. So it will never happen.

But you can do it with incredibly small objects, if you build a gigantic Hadron Collider.

You can easily read up on it, and find out what they've observed so far.
99.99999% of the speed of light is quite sufficient for most practical purposes like interstellar travel.
Like I said, the energy required would be nearly infinite for something as big as a teacup.
And you would have to expend exactly the same at the destination, to slow it down and stop it.
Just go into an expanding orbit around a black hole.

What could go wrong?
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Re: Serious Light Speed Discussion

Post by Brian Peacock » Fri Mar 16, 2018 1:34 am

Lightspeed is quite easily acquired...

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Re: Serious Light Speed Discussion

Post by Tyrannical » Fri Mar 16, 2018 5:08 am

mistermack wrote:
cronus wrote:
mistermack wrote:Large objects that attain speeds approaching that of light will have had nearly infinite energy put into them to get to that point.
There is no mechanism in the Universe capable of doing that. So it will never happen.

But you can do it with incredibly small objects, if you build a gigantic Hadron Collider.

You can easily read up on it, and find out what they've observed so far.
99.99999% of the speed of light is quite sufficient for most practical purposes like interstellar travel.
Like I said, the energy required would be nearly infinite for something as big as a teacup.
And you would have to expend exactly the same at the destination, to slow it down and stop it.
But what about a cannibalistic matter conversion engine? The closer to the speed of light it goes, the more massive it becomes, and the mass is transferred into energy to make it go faster! Now it's just an engineering problem :{D
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Re: Serious Light Speed Discussion

Post by pErvinalia » Fri Mar 16, 2018 6:13 am

It doesn't actually become more massive. Only to an outside observer in a different inertial frame.

Actually I'm not even sure if it would get more "massive". It would elongate in length in the direction of travel from the frame of an observer. Does that actually make it gain mass?
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Re: Serious Light Speed Discussion

Post by mistermack » Fri Mar 16, 2018 2:28 pm

It doesn't become more massive. It's rest mass remains the same. It gains what is called relativistic mass, which is just an expression to use to describe the total energy of the system. It's a controversial notion, as it's not really mass as normally understood.
It's the m in mc2 giving the total energy of a moving object.
The rest mass is the m in mc2 in the rest frame of the object.
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