nasu's latest activity

If you use x as the horizontall coordinate, the width of these strips is not dx.

You may get better/more answers if you formulate a more specific question rather than just this "check my work" format with three pages...

Our passage through time goes unhindered. Unless you're Phil the weatherman, you can't stop and redo today over and over. I would...

17 years in less than a month. Not very active lately. Getting older I suppose. But still one of the first things I do in the morning is...

It's been 21 years for me. I'm glad I found PF because the signal-to-noise ratio on sci.physics.relativity was terrible.

What's with the bicycle? Is there a part (b)?

Yes, but what is required to quickly convert vertical height into horizontal velocity, is the second half of an Immelmann turn...

I see the wording issue a little differently. In usual terminology , an "axis" is not a physical object, any more than is a line or...

In a sled??😁😊

For me, the simplest argument is to propose that if global inertial frames exist at all then the transformation between them must map...

Isn't the glide ratio dependent on the horizontal velocity? The OP seems to assume that there is no initial horizontal velocity, doesn't it?

Yes. ##2020-2015## is ##5## years and ##2025-2015## is ##10## years. So the mathematical question is, do there exist two timelike...

Yeah, nothing more annoying than the student who can't be bothered to even try. I do, however, generally find that most of my STEM...

Which one? Besides, I don't think that every single mathematic manipulation has physical meaning. Again, what's the physical meaning of...