Warning

 

Close

Confirm Action

Are you sure you wish to do this?

Confirm Cancel
BCM
User Panel

Site Notices
Arrow Left Previous Page
Page / 2
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
Link Posted: 5/18/2012 6:30:20 AM EDT
[#1]
pie are squared

two pie are

three four five triangle


Link Posted: 5/18/2012 6:41:26 AM EDT
[#2]
v = ir
f=ma
Link Posted: 5/18/2012 6:48:00 AM EDT
[#3]
soh cah toa

PV = nRT  I always remembered as "pervert"

Θdangle    (1/Tmeat)
Link Posted: 5/18/2012 6:53:08 AM EDT
[#4]
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?
Link Posted: 5/18/2012 7:18:48 AM EDT
[#5]
Quoted:
soh cah toa

PV = nRT  I always remembered as "pervert"

Θdangle    (1/Tmeat)




Fg = -Gm1m2/r^2
Link Posted: 5/18/2012 8:07:33 AM EDT
[#6]
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
Link Posted: 5/18/2012 8:17:17 AM EDT
[#7]
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.
Link Posted: 5/18/2012 8:21:58 AM EDT
[#8]
Height x 1,000/mils = distance


Link Posted: 5/18/2012 10:04:50 AM EDT
[#9]
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
Link Posted: 5/18/2012 10:11:04 AM EDT
[#10]
P=IxE
Link Posted: 5/18/2012 12:41:06 PM EDT
[#11]
$=PIE (.Y.) =
Link Posted: 5/18/2012 5:46:56 PM EDT
[#12]
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
Link Posted: 5/20/2012 10:12:04 AM EDT
[#13]
dp/dz = -rho*g;

Link Posted: 5/21/2012 8:29:50 AM EDT
[#14]
exp(i*pi)=-1
Link Posted: 5/21/2012 8:31:29 AM EDT
[#15]
I was going to say a^2 + b^2 = c^2, but you guys make me feel dumb.

Link Posted: 5/21/2012 8:32:11 AM EDT
[#16]
F=qVB
Link Posted: 5/21/2012 8:41:38 AM EDT
[#17]
PACO2=VCO2
             x 0.863 / VA



O2 content= [Hb] (%sat) + dissolved O2



CaO2=(SaO2
             x Hb x 1.34) + .003(PaO2)





 
Link Posted: 5/21/2012 11:16:44 AM EDT
[#18]
Quoted:
Allowable pressure from thin-walled pressure vessels

Nice.  

Posted Via AR15.Com Mobile
Link Posted: 5/21/2012 11:22:48 AM EDT
[#19]
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)
Link Posted: 5/21/2012 9:26:47 PM EDT
[#20]
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
Link Posted: 5/21/2012 9:28:50 PM EDT
[#21]
Link Posted: 5/21/2012 9:39:36 PM EDT
[#22]
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.
Link Posted: 5/27/2012 5:50:25 AM EDT
[#23]
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
Link Posted: 5/27/2012 4:34:20 PM EDT
[#24]
two things from my math degree that I'll never forget:



and the proof that the real numbers are uncountable:

Link Posted: 6/17/2012 5:56:11 PM EDT
[#25]
A=L+OE
Link Posted: 6/17/2012 7:43:47 PM EDT
[#26]
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
Link Posted: 6/18/2012 1:13:38 PM EDT
[#27]
T=(2d/g)^1/2

Posted Via AR15.Com Mobile
Link Posted: 6/18/2012 8:26:00 PM EDT
[#28]
Link Posted: 6/20/2012 4:22:18 AM EDT
[#29]
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.
Link Posted: 6/25/2012 4:11:45 PM EDT
[#31]
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
Link Posted: 6/25/2012 4:20:00 PM EDT
[#32]
W
A   M


Beat into the head of every Loadmaster.

Link Posted: 7/1/2012 8:29:08 AM EDT
[#33]
y=mx+b

y=a(x-h)^2+k
Link Posted: 7/1/2012 9:06:52 AM EDT
[#34]
Quoted:
W
A   M


Beat into the head of every Loadmaster.


Weight over axles * motor?


Posted Via AR15.Com Mobile
Link Posted: 7/1/2012 11:03:04 AM EDT
[#35]
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



Link Posted: 7/1/2012 1:21:39 PM EDT
[#36]
Statics, love it.

Posted Via AR15.Com Mobile
Link Posted: 7/1/2012 1:31:11 PM EDT
[#37]
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

Link Posted: 7/1/2012 2:20:14 PM EDT
[#38]
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".  
Link Posted: 7/9/2012 5:24:58 PM EDT
[#39]

void Move(int n,char frompeg,char topeg,char auxpeg) {
if(n==1) return;
Move(n-1,frompeg,auxpeg,topeg);
Move(n-1,auxpeg,topeg,frompeg);
}
Link Posted: 7/9/2012 5:33:31 PM EDT
[#40]
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.
Link Posted: 7/9/2012 10:31:37 PM EDT
[#41]
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
Link Posted: 7/9/2012 10:39:40 PM EDT
[#42]
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
Link Posted: 7/10/2012 1:57:21 AM EDT
[#43]
Blah. I forget nearly all of them within six months. Use it or lose it.
Link Posted: 7/13/2012 11:29:59 AM EDT
[#44]
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
Link Posted: 7/13/2012 11:36:02 AM EDT
[#45]
1 =/= 2, except for very large values of 1.
Link Posted: 8/7/2012 6:19:05 AM EDT
[#46]
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:

Link Posted: 8/29/2012 7:20:52 PM EDT
[#47]
G=Vo/Vi
Link Posted: 9/1/2012 6:19:25 AM EDT
[#48]


Link Posted: 12/18/2012 4:11:01 PM EDT
[#49]
All this and nobody brings up E=mC^2?
Link Posted: 12/25/2012 5:26:58 PM EDT
[#50]
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.
Arrow Left Previous Page
Page / 2
Close Join Our Mail List to Stay Up To Date! Win a FREE Membership!

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.


By signing up you agree to our User Agreement. *Must have a registered ARFCOM account to win.
Top Top