renormalize's latest activity

That's not true in general. The attractive force of a harmonic oscillator has positive energy. Attractive central-potentials of the form...

How naive are you? I have personally reported to the forum mentors dozens of spam posts here selling scientific instrumentation...

But the 1972 picture is doubtless a film photo while the one from 2026 was most likely captured by a digital sensor. Can you cite...

Noooo. The 1972 pic was taken of the sunward side of the Earth - almost full sun. The 2026 pic was taken of the Earth's night side -...

Must be a Rorschach test! I see Africa, the Middle East and Madagascar in 1972 and Australia(?) in 2026.

I boosted the brightness and contrast a bit on your Artemis photo and voilà! Earth in 2026 actually looks as good or even better than it...

Your step:$$\lim_{x\to0}\frac{\frac{\tan(\tan x)}{tan(x)}\cdot\frac{1}{sin(x)}-\frac{\sin(\sin...

Can you cite a credible textbook reference that supports those claims?

So you assert that the metals mercury at room temperature and aluminum at 660°C are not soft materials?

Further posts in this thread should be pointers to other level-appropriate sources of accurate information.

Welcome to PF, CHANG; it's good to have you here. :smile:

I would imagine it's because you wrote this: ...which certainly read to me as if you thought that weight was a concept that was...

Weight is mass times gravity. I still worry that your post #8, where you imply that going metric involves switching from weight to...

The observational data on the fine-structure constant has since been extended out to 13 billion light years (as of 2020) and so far...

I've done no complaining nor conceding because my very first post in this thread is #20 just above. Do you even bother to check who...