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Today,
07:16 AM
Vol
replied to a thread
Shrodinger's equation step
in
Differential Equations
Oh, I see now. But why are we doing that? What is -2m/h^2?
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3 replies | 30 view(s)
Today,
06:48 AM
HallsofIvy
replied to a thread
Help Needed On Vector Problems
in
Calculus
Whoever gave you this problem clearly expects you to know that the area of triangle ABC is given by \frac{1}{2}\left|\vec{AB}\times \vec{AC}\right|. ...
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1 replies | 14 view(s)
Today,
06:36 AM
HallsofIvy
replied to a thread
How to make oval shape
in
Arithmetic
The equation of an ellipse with center at (x_0, y_0), semi-axis parallel to the x-axis of length a and semi-axis parallel to the y-axis of length b...
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2 replies | 11 view(s)
Today,
04:39 AM
mmm4444bot
replied to a thread
How to make oval shape
in
Arithmetic
The oval is called an ellipse, and you can make it using paper and pencil or you can plot it on xy-coordinate systems using a formula. :cool:
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2 replies | 11 view(s)
Today,
04:35 AM
mmm4444bot
replied to a thread
Need help writing a universal equation involving time and stepping rates.
in
Finance/Business Math
I'll need more time to study your latest exceptions description, but do you realize there will still be ranges of charges generated for the same...
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35 replies | 1784 view(s)
Today,
03:51 AM
mmm4444bot
replied to a thread
Need help writing a universal equation involving time and stepping rates.
in
Finance/Business Math
Do I understand this correctly? You own a parking lot, and a guy who paints signs is helping you figure out how to charge customers?
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35 replies | 1784 view(s)
Today,
03:40 AM
DFGDFG
started a thread
How to make oval shape
in
Arithmetic
Hello How to make oval shape which formula is used what is calculation of it
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2 replies | 11 view(s)
Today,
03:16 AM
mmm4444bot
replied to a thread
Li'l math puzzle
in
Math Odds & Ends
3 8 3 8 8 3 8 8 8 3 8 8 3 8 3 3 8 3 3 3 8 3 3 8 3 3 8 3 8 3 8 8 3 8 8 8 3 8 8 3 8 3 3 8 3 3 3 8 3 3 8 3 3 8 3 8 3 3 3 8 3 3 8 3 3 8 3 8 3 8 8 3 8 8...
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7 replies | 63 view(s)
Today,
03:14 AM
mmm4444bot
replied to a thread
Li'l math puzzle
in
Math Odds & Ends
Clever cat, but you don't get to use 9 (lives).
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7 replies | 63 view(s)
Today,
03:09 AM
mmm4444bot
replied to a thread
Method of solving
in
Intermediate/Advanced Algebra
Algebra. :cool:
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4 replies | 40 view(s)
Today,
02:50 AM
mmm4444bot
started a thread
One Dual Crypt?
in
Math Odds & Ends
\quad Find one answer, then find a different answer. Holiday season lacks initial direction for plant (5) & (5)
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0 replies | 8 view(s)
Today,
12:22 AM
Harry_the_cat
replied to a thread
Li'l math puzzle
in
Math Odds & Ends
If the numbers 3, 3, 8 and 8 are to base 9, then 38 - 8 - 3 works. 389= 3*9+8 = 35 39 = 3 89 = 8
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7 replies | 63 view(s)
Today,
12:10 AM
Harry_the_cat
replied to a thread
Li'l math puzzle
in
Math Odds & Ends
One question : Is it possible? (if not, I dont want to waste my time!!):confused:
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7 replies | 63 view(s)
Yesterday,
11:42 PM
topsquark
replied to a thread
Method of solving
in
Intermediate/Advanced Algebra
We do it for non-linear equations as well. :shock: -Dan
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4 replies | 40 view(s)
Yesterday,
11:39 PM
topsquark
replied to a thread
Li'l math puzzle
in
Math Odds & Ends
As a Physicist I'd do it this way: 3 * 8 = 24. The other terms are merely a perturbation and are therefore non-relevant. (Hey, if I'm allowed to...
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7 replies | 63 view(s)
Yesterday,
11:36 PM
topsquark
replied to a thread
Shrodinger's equation step
in
Differential Equations
Minor correction: Dr. Peterson is correct but there is a bit of a typo in the OP: We are using \hbar \equiv \dfrac{h}{2 \pi} and not Planck's...
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3 replies | 30 view(s)
Yesterday,
11:17 PM
Dr.Peterson
replied to a thread
Stuck on limit question (limit of e): [e^{a/x} + 1] / [e^{b/x} + 1] = a + b
in
Calculus
What is the derivative of a/x? (Not of ax!)
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3 replies | 59 view(s)
Yesterday,
11:03 PM
Dr.Peterson
replied to a thread
Shrodinger's equation step
in
Differential Equations
I think, if I'm interpreting your equations correctly, that you are asking how to get from \displaystyle -\frac{h^2}{2m} \frac{d^2\psi}{dx^2} +...
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3 replies | 30 view(s)
Yesterday,
10:41 PM
Dmsan
started a thread
Help Needed On Vector Problems
in
Calculus
Our class had been doing the cross product, dot product, and vector projection but I'm really not good at it. I am stuck on the Strengthening Set...
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1 replies | 14 view(s)
Yesterday,
10:34 PM
Vol
started a thread
Shrodinger's equation step
in
Differential Equations
In schrodinger's equation it says -h^2/2m d^2psi/dx^2 + 1/2mw^2x^2psi = Epsi which is equal to d^2psi/dx^2 + (2mE/h^2 - m^2w^2/h^2 times...
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3 replies | 30 view(s)
Yesterday,
09:45 PM
sinx
replied to a thread
Question about circumference
in
Geometry and Trig
in a way it is. the length you describe will have the same measurement as the circumference.
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5 replies | 75 view(s)
Yesterday,
09:36 PM
sinx
replied to a thread
Get distance from XY position unto the nearest point of a square
in
Geometry and Trig
distance=2+y2]1/2
see more
3 replies | 49 view(s)
Yesterday,
08:17 PM
Denis
replied to a thread
Army crypt
in
Math Odds & Ends
Sorry...twas my "1 clue per day" for today...
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18 replies | 183 view(s)
Yesterday,
08:12 PM
Denis
replied to a thread
Li'l math puzzle
in
Math Odds & Ends
Unfortunately, no tricks allowed :twisted:
see more
7 replies | 63 view(s)
Yesterday,
07:11 PM
Harry_the_cat
replied to a thread
two way table: 115 students attend at least one of football, tennis, and running
in
Probability / Statistics
You also know that the total of the football column is 32.
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3 replies | 39 view(s)
Yesterday,
07:07 PM
Harry_the_cat
replied to a thread
Method of solving
in
Intermediate/Advanced Algebra
Balancing the equation maybe??
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4 replies | 40 view(s)
Yesterday,
07:05 PM
pka
replied to a thread
two way table: 115 students attend at least one of football, tennis, and running
in
Probability / Statistics
To solve this question you must complete this table. We are given all necessary information to do that. \begin{array}{*{20}{r}}...
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3 replies | 39 view(s)
Yesterday,
07:03 PM
SirJobz
replied to a thread
Stuck on limit question (limit of e): [e^{a/x} + 1] / [e^{b/x} + 1] = a + b
in
Calculus
So I think I’d made the mistake because in question they said a,b > 0 and you can find a and b value. that’s how I stuck in this question.
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3 replies | 59 view(s)
Yesterday,
05:31 PM
spaceshowfeature1
replied to a thread
I Need the Answers to these Problems: Two cars start out at the same spot....
in
Intermediate/Advanced Algebra
Thanks everyone!
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5 replies | 116 view(s)
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