General Questions

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I just want to ask some information about a product they develop.



And ... thinks thanks.



:)
 
"Dear sir or madam" is appropriate for a polite letter of interest. "To whom it may concern" is more for complaints.
 
"Dear sir or madam" is appropriate for a polite letter of interest. "To whom it may concern" is more for complaints.

Agreed.

If you know the name of the person you're writing to, use Dear (given title and surname only) and at the end put Yours Sincerely.

If you don't know the name of the person you're writing to, use Dear Sir/Madam and at the end put Yours Faithfully.
 
If you look at my post again, you see that part of the molecule chain in nitromethane IS nitrous oxide, which carries oxygen into the combustion.

And all the fuel in an engine is vaporized to be as close to a gas as possible. That's what a carb or an injector does.

Um, no, actually, both of those devices squirt liquid fuel, and then atmospheric conditions inside the intake manifold are relied upon to vapourise it. In fact, top fuel dragsters are injecting so much fuel that they are operating on the borderline of hydraulic lock. This is why you see so many blowups - a couple too many revolutions without a clean burn, and the piston pushes the cylinder head off locally, letting air in around the adjacent cylinders with catastrophic effects.

The Blu-tac is off the wall, but it's left a stain. I'm going to try white spirit/methylated spirit later. Got some plastering and filling in my room too. Yay.

Blue-Tac contains oils, so you're on the right lines. Try cellulose thinners - a vehicle paint repair shop might give you a tiny jarful for free if you ask nicely.

How small is 1 byte of data? I know this sound stupid but..... could you even see data? Lets put it this way, a 1GB of memory could fit into a small micro SD card, is it even smaller than an atom or even a nucleus? That is ridiculously small..... :eek:

Hm. This is a cracking question for hypothetics. A measurable quantum state would give you a bit, so you need eight of them.

The same as the smell of yellow.

But yellow is tangible, like green. Don't you do history? Green was discovered by the noted 16thC alchemist, Lord Percy Percy, heir to the the Duchy of Northumberland.

Why does Jordan like Citroens?

She likes Citroens? I dunno. Good airbags? Suspension systems that aren't a bouncy ride?

Oooooooohhhh, that Jordan.

Who is the next most intelligent person after Steven Hawking?

Demi Moore.

No, you meant Sir Patrick Moore. Demi Moore would, fairly obviously, only be half as intelligent as Sir Patrick.

"Now: how much do you charge for a good, hard, shag?"
 
What is the gearbox of a top fuel dragster like?

I just went on Andy Carter's website and it says it only has forwards and reverse. Yet I seem to remember something about them making 4 gear changes over the quarter mile?
 
I believe it's a 2-3-4 speed auto with a manual valve-body and air/ratchet shifter
 
Mg(ClO4)2
Fe(NO3)2
As you said, ClO would be perchlorate, and NO would be nitrate
ClO4 is perchlorate, ClO is just regular chlorate.
NO is nitric oxide. NO3 is nitrate.

On the one including Iron, someone made sense of it by saying that the number outside the parenthesis was the original charge (making it Iron(II) nitrate), but I don't see how it works out for magnesium perchlorate.
I use the swap-and-drop method:
For an ionic compound AxBy, the charge on the A+ ion is y, and the charge on the B- ion is x.

So Mg(ClO4)2 is Magnesium(II) perchlorate.

I am also trying to figure oxidation numbers and am stuck on a few as well.

Oxidation number for carbon in - (CO3)^2-

Oxidation number for chromium in - Na2Cr2O7

I'm stuck on the first because I know what number oxygen would be, but the ^2- is just baffling me. In the second, oxygen would apparently become -14 (oxidation number -2) but I can't figure how I would split Na and Cr to make the sum equal zero (one could be 6 and the other 8, but which will be which?)
First:
CO3 ion has 2 negative charges on it. Oxy number of O is -2, so the total oxy number of O3 is -6. As the ion has an overall net negative charge of -2, the sum of the oxidation numbers must be equal to -6 + C = -2 (sum of the oxidation numbers = charge on ion), so the oxy number of C in the carbonate ion is +4.

C = +4
O = -2
(check: [1 x 4]+[3 x -2] = -2)

Second:
Oxygen is -2, as always (except for peroxides). Charge on Cr2O7 2- ion is -2.

Sum of oxygens = -14.
-14 + 2Cr = -2, so 2Cr = -12, so Cr is +6. (check: [2 x +6]+[7 x -2] = -2).

Charge on dichromate ion is -2 (as said above), so oxy number of Na is +1 (as 2 sodium atoms).

Na = +1
Cr = +6
O = -2
(check: [2 x 1]+[2 x 6]+[7 x -2] = 0)
 
ClO4 is perchlorate, ClO is just regular chlorate.
NO is nitric oxide. NO3 is nitrate.
I Know that ClO is just chlorate, I used perchlorate since that was the example formula he was using and I couldn't be arsed to do some subscript. :lol:
 
Thank you very much, that was quite informative.

The test today was somewhat hard. Having done that worksheet last night (along with waking up at 3:00am) helped me do pretty well on the multiple choice portion of the test. The only problem is that along with the multiple choice (which is the only thing she told us about), there is another 80 point 3-4 page worksheet dealing with the formulas :grumpy:. I don't know how how she expects us to remember all the ionic compounds, I can barely remember them when I'm not under the pressure of a test.

Anywho, I have one quick question. If Fe(NO3)2 is Iron(II) nitrate, would Fe(NO2)3 be Iron(III) nitrite?
 
F1GTR
I Know that ClO is just chlorate, I used perchlorate since that was the example formula he was using and I couldn't be arsed to do some subscript. :lol:
Lazy bugger :p

Anywho, I have one quick question. If Fe(NO3)2 is Iron(II) nitrate, would Fe(NO2)3 be Iron(III) nitrite?
Yes.
 
It turn yellow.
What are non-orientable surfaces, and what's so special about a klein bottle?
 
To the maths wizzes: I need some help evaulting logarithmic expressions without a calculator.

The first one is pretty easy — log3(1/81)

1/81 = 1/(3^4) = 3^-4
Therefore you can see that log3(1/81) = -4​

The next one has me stumped though — (log47)(log716)

With the first it was easy to see that 3^1 = 3, 3^2 = 9, 3^3 = 27 and 3^4 = 81, but how am I supposed to work out what power to raise 4 to to get an answer of 7 in my head (I know its 1.404 by using a calculator), and likewise for 7 to get 16?
 
But yellow is tangible, like green. Don't you do history? Green was discovered by the noted 16thC alchemist, Lord Percy Percy, heir to the the Duchy of Northumberland.

Yellow is cheaper to fake though.



As a random thought: What the hell is dust? I keep vacuuming the apartment every week, and it keeps reappearing in the most unusual places, as if it materializes out of thin air - which it probably does, in one way or the other.
 
As a random thought: What the hell is dust? I keep vacuuming the apartment every week, and it keeps reappearing in the most unusual places, as if it materializes out of thin air - which it probably does, in one way or the other.

A good amount of it, at least from what I know, is dead skin cells.
 
The next one has me stumped though — (log47)(log716)

With the first it was easy to see that 3^1 = 3, 3^2 = 9, 3^3 = 27 and 3^4 = 81, but how am I supposed to work out what power to raise 4 to to get an answer of 7 in my head (I know its 1.404 by using a calculator), and likewise for 7 to get 16?

Best way to do it is to keep the whole equation as logs for as long as possible...

log4(7) = log(7)/log(4) and log7(16) = log(16)/log(7), so...

log4(7).log7(16) = [log(7)/log(4)].[log(16)/log(7)] = log(16)/log(4) = log4(16) = 2

As for working out the numerical value of, say, log4(7) without a calculator, I don't know how you'd do that without drawing a graph on logarithmic-scaled paper, or drawing a very accurate graph on normal graph paper... (i.e. 4^0=1, so plot (1,0); 4^1=4, so plot (4,1); 4^2=16, so plot (16,2) etc. 4^x=7 could be solved by finding the point on the y-axis when x=7...)
 
Is a detached tooth capable of surviving in calcium-enriched juice if enough of it exists in the substance?

I would think the citric acid would be far worse for the tooth than the calcium would be good for it. If I had to transport my knocked out tooth to the emergency dentist, I think I'd choose water over calcium-fortified juice is milk was not available.
 
Best way to do it is to keep the whole equation as logs for as long as possible...

<snip>
Argh. I hate it when something is so blindingly obvious. :ouch:

I did think about changing the equations to log10, but didn't think far enough ahead about keeping them as logs and having the two log10(7)'s cancel out. Thanks TM. 👍
 
I'm working on this argumentative essay for English and I'm arguing that kids in schools try to fit in just so they can be the coolest kid around.

I've talked about how they don't have to act like the big shots at the school, but I need more arguments against this. Anybody have any suggestions?
 
Which brings the question of dead skin reaching the top parts of my bookshelves :p

Air currents in your house is the likely cause.

I'm working on this argumentative essay for English and I'm arguing that kids in schools try to fit in just so they can be the coolest kid around.

I've talked about how they don't have to act like the big shots at the school, but I need more arguments against this. Anybody have any suggestions?

Very interesting topic. You could say that they can still have a good time without necessarily fitting in. High schools are very diverse places; likely there is at least one person whom the people fitting in can correspond with and thus be free to enjoy their years.
 
Which brings the question of dead skin reaching the top parts of my bookshelves :p

Air circulation, especially if you have a fan.

I run my ceiling fan in my room on high 24/7, and as a result, there is a good 1/4 inch thick (around that) layer of dust on the front of each fan blade. It looks disgusting, but I leave it there because it allows my fan to balance itself.

EDIT: Tree'd :ouch:
 
What is the gearbox of a top fuel dragster like?

I just went on Andy Carter's website and it says it only has forwards and reverse. Yet I seem to remember something about them making 4 gear changes over the quarter mile?

Only one speed. Controlled clutch engagement (i.e. slipping the whole way, but less and less) and an increase in tire circumference with speed are what makes the "ratio" change during the run.

Pro Stock cars (production-based body, giant gasoline engines, have a 4-speed, with a lever for each gear. In-car shots, show the driver slamming a lever, then another, then another, then another.
 
I'm working on this argumentative essay for English and I'm arguing that kids in schools try to fit in just so they can be the coolest kid around.

I've talked about how they don't have to act like the big shots at the school, but I need more arguments against this. Anybody have any suggestions?

Do some Google searching around social groups and the ingroup/outgroup phenomenon. Some very interesting research was done in the mid-80s to early-90s around UK soccer fans and the hooligans, plus the attendant violence. It looks at how & why the fights started, how quickly they spread, and also how easily individuals surrender their personal values in the face of a countermanding group instinct.

I would love to give you more than "go search, this is what to look for", but I only studied it for about three months nearly 12 years ago...
 
Only one speed. Controlled clutch engagement (i.e. slipping the whole way, but less and less) and an increase in tire circumference with speed are what makes the "ratio" change during the run.

Pro Stock cars (production-based body, giant gasoline engines, have a 4-speed, with a lever for each gear. In-car shots, show the driver slamming a lever, then another, then another, then another.

Increase in tire circumference? So, the heat from running 400m quickly actually increases the rear tire size?

Is there any advantage to having subsonic ICBMs over supersonic types?
 
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