February 2010
4 posts
Calculator Bar →
fuckyeahmath:
A Firefox add-on that adds a calculator right above your status bar
x(t)=Acos(ωt+φ)=Re[Ae^(jφ)*e^(jωt)]
True dat. Word.
January 2010
23 posts
TI 84
A darling.
If you go to STAT: EDIT: EDIT and enter a series of values into whichever of the lists
Then go to STAT: CALC: 1 (1-Var Statistics)
and indicate the list you want (2nd, 1-6)
You’ll get their average, their sum, the square of the sum, the standard deviation, the min, the max, and the quartile values.
Of course, you can do all sorts of nifty other statistics-related operations...
“If you really want to hear about it, the first thing you’ll probably want to...”
– J.D. Salinger, The Catcher in the Rye (via first-lines)
glimflashy
wordjournal:
adjective • [obsolete] angry, or in a passion.
From The 1811 Dictionary of the Vulgar Tongue, originally by Francis Grose.
purchase of the day
auragreen:
Yes, my purchases of the day are books.
Those twenty-four dollars better ensure I never make another grammatical error in my life.
Oh, you professors and your required texts. Sigh.
Ten Commandments for Mathematics
fuckyeahmath:
1. Thou shalt read Thy problems.
2. Whatsoever Thou doest to one side of ye equation, Do ye also to the other.
3. Thou must use Thy “Common Sense” else Thou wilt have flagpoles 9,000 feets in height, yea… even fathers younger than sons.
4. Thous shalt ignore the teachings of false prophets to do work in Thy head.
5. When Thou knowest not, Thou shalt look it up, and if...
i've got a literal mountain of books on my desk
auragreen:
In the future,
I’ll keep posts shorter. Heh.
In the meantime! Here’s a comic:
3 tags
General Chemistry ~ Nomenclature Continued2
ACIDS
Remember how I mentioned that if, after adding a hydrogen cation or two, a polyatomic ion still carried an overall charge, then it’s still considered a polyatomic ion? (which sounds really convoluted and obvious)
If enough H+ are added that the molecule as a whole no longer has a charge, it becomes an acid (a molecular compound as opposed to an ion).Most acids are ternary compounds,...
General Chemistry ~ Nomenclature continued
POLYATOMIC IONS-nomenclature
First, some miscellaneous exceptions from the rules we’ll soon introduce:
OH(-) —> hydroxide, the ion that comes into play with bases
CN(-) —> cyanide
these follow closely to the nomenclature rules of monoatomic anions.
There are few regularly used polyatomic cations. One such ion is:
NH4(+) —> ammonium ion
Often, polyatomic...
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General Chemistry ~ NOMENCLATURE , EPIC OH NOEZ
FIRST, THE DIFFERENT CLASSES OF NOMENCLATURE
ions - usually solids with high melting points
salts- a class of ionic compounds in which a metal is bound to a nonmetal. When a metal replaces the H+ in acids, a salt forms.
acids - a compound made up of a H+ atom and an anion. When dissolved in an aqueous solution, the hydrogen atoms disassociate, giving acids their corrosive properties and their...
3 tags
3 tags
General Chemistry ~ Combustion Analysis
So they tell you a certain mass of a hydrocarbon gives you a certain mass of CO2 and a certain mass of H20. What’s the empirical formula?
Hydrocarbons are molecules containing only hydrogen and carbon.
Therefore, you can pretty much ignore the role of oxygen. OXYGEN BEGONE.
Convert the mass of CO2 you have to moles. How? The periodic table. 1 mol of oxygen is 16.00 grams. One mole of...
6 tags
First Entry
Format will be as follows:
Title giving general idea of the subject
Post with my explanation for something academic related.
Feel free to reblog if I’m mistaken. I’ll follow you. We’ll have an open minded discussion.
And once in a while, I’ll post something fun, yes?