anuttarasammyak's latest activity

Yes. Ref. https://www.feynmanlectures.caltech.edu/II_01.html

@gen x Let us see the case of moving-spinning disk as sketched below. Orbit of O is a line. The disk is rotating around O with...

If I did it right, for 1 Bq radioactivity we should have ##5 \times 10^7 ## kg Tellurium sample, which is more or less weight of Titanic.

FYI Landau-Lifsitz's Mechanics explains in section 31 Then they investigate the case where O' which is distance a from O is taken. I...

A sample made of a lot of radioactive nuclei started to decay immediately after it was generated.

Agreed. Now the larger square is the 1m square. The overlap depends on the relative orientation until ##s## shrinks to...

$$s=\sqrt{2}/2$$is the minimum value satisfying it though not larger any more. And also $$s=\frac{1}{2\sqrt{2}} $$is the maximum.

Suppose the object is rigid. Fixing the positions of any three points on the object is sufficient to construct a co-moving coordinate...

It seems not necessary. For any angle configuration we get the same result.

The contraposition: "E[ X ] converges thus E[ |X| ] converges" seems easier to handle. $$ E[|x|]:=\int_{-\infty}^{+\infty} f(x)|x| dx =...

Integral for even n diverges clearly to plus infinite. Integral for odd n is zero for integrand [-L,L]. However we do not have such a...

For my interest what Pet stands for and what role does it play ？

Sure. The Second Newton is ##m\boldsymbol {\dot v}= \boldsymbol R.## Here ##\boldsymbol R =R\boldsymbol e_x## stands for the tension...

it seems yes

A disk of radius ##r## is wrapped with an inextensible massless string. A particle of mass ##m## is attached to the end of the string...