# Science questions not worth a thread II

#### thetrooper

##### Misanthrope
Cough cough... a thread with plenty of dust.

Any ICP-OES techs here?

If so; possible interference for Co, Zn, Cr, Pb, Cu in Fe matrix?

#### Reconciliator

##### Chieftain
Dust quickly gathering again!

• thetrooper

#### thetrooper

##### Misanthrope
All we are is dust in the wind.

This place is in the end stage.

#### thetrooper

##### Misanthrope
Could someone tell me the mechanics behind suspended solids, e.g. in wastewater, being environmentally challenging?

#### thetrooper

##### Misanthrope
Could someone tell me the mechanics behind suspended solids, e.g. in wastewater, being environmentally challenging?

Nope?

How about buffer capacity of sea water for acidic consumption? Formulas, chemical species, salinity dependence?

#### Kyriakos

##### Creator
I have a question. It's tied to this (but not this) While it is simple to find the area, I was wondering why it is almost (but a tiny bit less) 2 times the area of the square (roughly 1.9635 times). Maybe @Grendeldef ?
(a fast way to calculate the area is to drop a vertical from A, to the line OD..., let's say at a point X, and notice that AX=OD, which leads to a line AO^2=5OD^2. And since AO=r, area is 5OD^2 pi/4, roughly 55).

#### thetrooper

##### Misanthrope

• Kyriakos

#### uppi

##### Deity
I have a question. It's tied to this (but not this)

View attachment 660520

While it is simple to find the area, I was wondering why it is almost (but a tiny bit less) 2 times the area of the square (roughly 1.9635 times). Maybe @Grendeldef ?
(a fast way to calculate the area is to drop a vertical from A, to the line OD..., let's say at a point X, and notice that AX=OD, which leads to a line AO^2=5OD^2. And since AO=r, area is 5OD^2 pi/4, roughly 55).
The area of the square is 2OD^2, so the ratio is
5/8*pi = 1.96349

#### Kyriakos

##### Creator
The area of the square is 2OD^2, so the ratio is
5/8*pi = 1.96349
Yes, but I don't mean "why" as in "do the calculation" (I already did so ). I mean "why" intuitively. As in, why (if you prefer) would this particular arrangement of an inscribed square, be virtually half of the quarter-circle where it is inscribed?
I hope I conveyed what I mean... Since the area of the quarter-circle is, as noted, 5OD^2 pi/4, of course if you divide that by the area of the square (which is 2OD^2) you get 5/8 pi. But it wasn't the spirit of my question!

Another hint as to how I meant it, was that I thought of arriving at it by some specific integral. Can you think of such, using the inscribed square to define the function? (can have more than one free variables).

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