Was Richard Feynman's explanation of the twin paradox wrong?

[Sagittarius A-Star]

Progress. The geometric algebra people got it down to one. But I thought that was silly because in order to do anything useful you have to unpack it.

Here is a GA T-shirt with Maxwell's equation:
https://bivector.net/merch.html#!/Maxwell-longsleeve/p/310027141

 

[PeroK]

But every step forward is an extension, not a replacement, and you have zero chance of understanding new developments without a solid foundation in what we have now.

In Helliwell's SR book, he says "every new theory swallows the previous one whole"! Newton is inside SR, which is inside GR, which will be inside a Quantum theory of gravity.

 

[gen x]

Explain how learning from YouTube videos instead of textbooks assures that you "...don't...learn physics that will be different for 100 years." Please be specific in your answer.

I am not learning, I just listen from time to time about this theories. Learning mean do physics=do calculation.
As I already said, I don't wont learn something that will be completely different for 100+ years, when we figure out what gravity and quantum world really is ..

 

[martinbn]

I am not learning, I just listen from time to time about this theories. Learning mean do physics=do calculation.
As I already said, I don't wont learn something that will be completely different for 100+ years, when we figure out what gravity and quantum world really is ..

It will not be different in a hundered years. What you learn now will be just the same then. There will be more things to learn, but the theories that you learn now will still be there. A hundred years ago people learned general relativity, today they also do that, in a hundred years they will still do it.

 

[gen x]

It will not be different in a hundered years. What you learn now will be just the same then. There will be more things to learn, but the theories that you learn now will still be there. A hundred years ago people learned general relativity, today they also do that, in a hundred years they will still do it.

I wrote 100+ years

 

[Roberto Pavani]

For myself, I find Newtonian dynamics interesting even though it's 300+ years old and "superseded" by GR.
And the same for Maxwell's electrodynamics.

 

[martinbn]

I wrote 100+ years

Replace 100 with 100+ in my post!

 

[gen x]

Replace 100 with 100+ in my post!

One day will be look at current physics just like now we look at Aristotelian physics.

 

[martinbn]

One day will be look at current physics just like now we look at Aristotelian physics.

What Aristotelian physics?

What about Archimedes? The law of lever, the buoyancy principle, and everything else he did is still taught and is still relevent today.

 

[Nugatory]

One day will be look at current physics just like now we look at Aristotelian physics.

Perhaps. But the work of Dunning and Kruger will remain as relevant as ever.

 

[FactChecker]

I'm glad it got reduced to 4. (One thing I never found out was whether anyone had made a T-shirt with the tensor formulation, which would have reduced it to two.) Maxwell's original 20 would never have fit on a T-shirt.

That depends on the size of the T-shirt and the beer-belly it was covering. I could do it.

 

[FactChecker]

Progress. The geometric algebra people got it down to one. But I thought that was silly because in order to do anything useful you have to unpack it.

That is true, but I like that the geometric algebra shows that it all comes from one concept/methodology, based on very basic considerations. That is intellectually pleasing to me.

 

[PeroK]

I wrote 100+ years

Are you planning to be around 100+ years from now?