User Panel
Posted: 5/18/2012 6:09:27 AM EDT
K=1/2mv^2
A=(pi*D^2)/4 p1v1=p2v2 pv=nrt A^2+B^2+C^2=D^2 P=(2st/d)FET (87 Internets to whoever knows that one) Posted Via AR15.Com Mobile |
|
soh cah toa
PV = nRT I always remembered as "pervert" Θdangle ∝ (1/Tmeat) |
|
Pythagorean, energy mass equivalency, telegraphers equations, IV relations for resistors, capacitors, and inductors (time and frequency domain), parallel R,C,L etc., KVL, KCL, LC resonant frequency, areas and volume for various shapes, Stokes Theorem... probably quite a few others that I have knocking around up there. One of these days I'll get around to actually memorizing Maxwell's equations in differential and integral form. There's a few others that I'm sure I'd like.
Quoted:
*snip* P=(2st/d)FET (87 Internets to whoever knows that one) I don't recognize it offhand, units on P? |
|
Quoted:
soh cah toa PV = nRT I always remembered as "pervert" Θdangle ∝ (1/Tmeat) Fg = -Gm1m2/r^2 |
|
Quoted:
Pythagorean, energy mass equivalency, telegraphers equations, IV relations for resistors, capacitors, and inductors (time and frequency domain), parallel R,C,L etc., KVL, KCL, LC resonant frequency, areas and volume for various shapes, Stokes Theorem... probably quite a few others that I have knocking around up there. One of these days I'll get around to actually memorizing Maxwell's equations in differential and integral form. There's a few others that I'm sure I'd like. Quoted:
*snip* P=(2st/d)FET (87 Internets to whoever knows that one) I don't recognize it offhand, units on P? psig. It's a formula from 49Cfr part 192. Posted Via AR15.Com Mobile |
|
Quoted:
Quoted:
Pythagorean, energy mass equivalency, telegraphers equations, IV relations for resistors, capacitors, and inductors (time and frequency domain), parallel R,C,L etc., KVL, KCL, LC resonant frequency, areas and volume for various shapes, Stokes Theorem... probably quite a few others that I have knocking around up there. One of these days I'll get around to actually memorizing Maxwell's equations in differential and integral form. There's a few others that I'm sure I'd like. Quoted:
*snip* P=(2st/d)FET (87 Internets to whoever knows that one) I don't recognize it offhand, units on P? psig. It's a formula from 49Cfr part 192. Posted Via AR15.Com Mobile Yep, outside my world it seems. |
|
Quoted:
Yep, outside my world it seems. It's the DOT equation for allowable pressure in a pipeline given certain factors. Posted Via AR15.Com Mobile |
|
Quoted:
K=1/2mv^2 A=(pi*D^2)/4 p1v1=p2v2 pv=nrt A^2+B^2+C^2=D^2 P=(2st/d)FET (87 Internets to whoever knows that one) Posted Via AR15.Com Mobile Allowable pressure from thin-walled pressure vessels ETA: beat me to it I'll never forget f=ma V=IR T = r x F K = 1/2 mv^2 P = mv PV = nRT Stress sigma = F/A |
|
I was going to say a^2 + b^2 = c^2, but you guys make me feel dumb.
|
|
PACO2=VCO2
x 0.863 / VA O2 content= [Hb] (%sat) + dissolved O2 CaO2=(SaO2 x Hb x 1.34) + .003(PaO2) |
|
Quoted:
Allowable pressure from thin-walled pressure vessels Nice. Posted Via AR15.Com Mobile |
|
ETA: Posted one thread response in the wrong thread, and now I have to post a function I never forget. Mine are mostly financial, so:
/\(S) = max {S - K, 0} (Payoff formula for a call option) |
|
I don't know how to do special symbols, but the Navier-Stokes equations in Cartesian coordinates. (I'd like to forget them though, and no way was I memorizing spherical/cyli coords)
Plus v^2/2+gh+P/rho=c |
|
I can still derive Bernoullis, basic strengths, and dynamics calculations... Sad thing, is I haven't used them for years.
|
|
Quoted:
I can still derive Bernoullis, basic strengths, and dynamics calculations... Sad thing, is I haven't used them for years. Same with me for everything I learned in Fluid Mechanics (except shell balances, which I use all the time). I thought it was cool that I could do all this awesome stufff with fluid mechanics, then I've never used it again. |
|
I learned this one in high school too many years ago, and still remember the derivation:
http://www.wolframalpha.com/input/?i=sum+1%2Fn^2 |
|
|
Quoted:
two things from my math degree that I'll never forget: http://i.imgur.com/CsWZQ.png and the proof that the real numbers are uncountable: http://i.imgur.com/eN7AF.png I have no idea what this means. Posted Via AR15.Com Mobile |
|
Vin=Vout, or Mass in = Mass out.
Or something is terribly, terribly wrong. |
|
Quoted:
Quoted:
two things from my math degree that I'll never forget: http://i.imgur.com/CsWZQ.png and the proof that the real numbers are uncountable: http://i.imgur.com/eN7AF.png I have no idea what this means. Posted Via AR15.Com Mobile A countable set means there is a one-to-one mapping between the members of the set and the integers. Which leads to interesting things like, there are "just as many perfect squares as there are integers", or "there are just as many rational numbers as there are integers". Proof left as an exercise to the reader. If the real numbers are countable, then there is a one-to-one mapping between all real numbers and the integers. There is a one-to-one mapping between all the real numbers in the interval [0 to 1) and the interval [0 to +infinity), that mapping is y = (x/x+1). So, if you show there isn't a mapping for [0 to 1) and the integers then there isn't one from [0 to +infinity). Suppose you write the real numbers in [0 to 1) in binary (they are in no particular order, but you had them all written down): r0 = .000101010101010101000011000... r1 = .1011000011110010101010101110... r2 = .1110110011100110101010101001... r3 = .0010111110010101010101110000... r4 = .0011001110101110011110000... ... rA = .1100110011001101010100001101... ... Consider the real number rD = where the Nth bit after the decimal is Nth bit of the Nth real, in this case rD is .00100... (the diagonal) Now, flip all the bits to construct rZ (which amounts to 1-rD), you have: .11011.... rZ is not in the list of real numbers, which contradicts the premise the all the real numbers are enumerated in the list. |
|
|
Quoted:
Vin=Vout, or Mass in = Mass out. Or something is terribly, terribly wrong. What if you're just pouring water in to a bucket Min =/= Mout |
|
Quoted:
W A M Beat into the head of every Loadmaster. Weight over axles * motor? Posted Via AR15.Com Mobile |
|
Quoted:
Quoted:
W A M Beat into the head of every Loadmaster. Weight over axles * motor? Posted Via AR15.Com Mobile Weight over Arm equals Moment |
|
Quoted:
Quoted:
Quoted:
W A M Beat into the head of every Loadmaster. Weight over axles * motor? Posted Via AR15.Com Mobile Weight over Arm equals Moment Evidently they didn't beat it hard enough The equation is T = rF or arm TIMES weight Remember that a longer arm creates a larger moment. If you divide by arm, your moment gets smaller as arm increases |
|
Quoted:
Quoted:
Quoted:
Quoted:
W A M Beat into the head of every Loadmaster. Weight over axles * motor? Posted Via AR15.Com Mobile Weight over Arm equals Moment Evidently they didn't beat it hard enough The equation is T = rF or arm TIMES weight Remember that a longer arm creates a larger moment. If you divide by arm, your moment gets smaller as arm increases They did beat it in....weight times arm equals moment. My mistake...I should have put "times" instead of "over". |
|
|
|
x / 0 = 0
And my go-to formula is the quadratic equation. Whenever I'm drinking and someone asks if I am drunk I can say nope, the quadratic equation is: ETA: Hotlink didn't work out too well... Although its well enough embedded in my head I remember it drunk. |
|
Quadratic equation X= -b +/- the sqare root of b^2 -4AC all over 2a
simple geography line plot y= mx+b Avogadro's number = 6.0221415 x 10^23 Escape velocity of a planet Ve = (2GM/a)^1/2 Gravitational Suspense Point F = G*M1*M2 all over r^2 |
|
Also I have learned that zero should never be include as the denominator in any case. But apparently Chuck norris can divide by zero.
Proof that girls are evil. First we state girls reuire time and money girls = time * money We all know time is money time = money therefore girls = money * money Money is the root of all evil evil = money^2 finally girls = money^2 = evil girls equal evil |
|
Blah. I forget nearly all of them within six months. Use it or lose it.
|
|
Quoted:
Quoted:
Quoted:
two things from my math degree that I'll never forget: http://i.imgur.com/CsWZQ.png and the proof that the real numbers are uncountable: http://i.imgur.com/eN7AF.png I have no idea what this means. Posted Via AR15.Com Mobile A countable set means there is a one-to-one mapping between the members of the set and the integers. Which leads to interesting things like, there are "just as many perfect squares as there are integers", or "there are just as many rational numbers as there are integers". Proof left as an exercise to the reader. If the real numbers are countable, then there is a one-to-one mapping between all real numbers and the integers. There is a one-to-one mapping between all the real numbers in the interval [0 to 1) and the interval [0 to +infinity), that mapping is y = (x/x+1). So, if you show there isn't a mapping for [0 to 1) and the integers then there isn't one from [0 to +infinity). Suppose you write the real numbers in [0 to 1) in binary (they are in no particular order, but you had them all written down): r0 = .000101010101010101000011000... r1 = .1011000011110010101010101110... r2 = .1110110011100110101010101001... r3 = .0010111110010101010101110000... r4 = .0011001110101110011110000... ... rA = .1100110011001101010100001101... ... Consider the real number rD = where the Nth bit after the decimal is Nth bit of the Nth real, in this case rD is .00100... (the diagonal) Now, flip all the bits to construct rZ (which amounts to 1-rD), you have: .11011.... rZ is not in the list of real numbers, which contradicts the premise the all the real numbers are enumerated in the list. I realize you are attempting to explain/ansewer his question but your translation is still fucked up a bicycle with square wheels... sorry eta ...not fucked up as in wrong ....just didn't help me understand |
|
Quoted:
Quoted:
two things from my math degree that I'll never forget: http://i.imgur.com/CsWZQ.png and the proof that the real numbers are uncountable: http://i.imgur.com/eN7AF.png I have no idea what this means. Posted Via AR15.Com Mobile very nice video explaining it: |
|
Quoted:
They did beat it in....weight times arm equals moment. My mistake...I should have put "times" instead of "over". I thought there was something odd, but I couldn't remember what it was. I took ground school when flight computers were just coming out. The instructor made us do weight and balance by hand before she let us play with the calculators. |
|
Sign up for the ARFCOM weekly newsletter and be entered to win a free ARFCOM membership. One new winner* is announced every week!
You will receive an email every Friday morning featuring the latest chatter from the hottest topics, breaking news surrounding legislation, as well as exclusive deals only available to ARFCOM email subscribers.
AR15.COM is the world's largest firearm community and is a gathering place for firearm enthusiasts of all types.
From hunters and military members, to competition shooters and general firearm enthusiasts, we welcome anyone who values and respects the way of the firearm.
Subscribe to our monthly Newsletter to receive firearm news, product discounts from your favorite Industry Partners, and more.
Copyright © 1996-2024 AR15.COM LLC. All Rights Reserved.
Any use of this content without express written consent is prohibited.
AR15.Com reserves the right to overwrite or replace any affiliate, commercial, or monetizable links, posted by users, with our own.