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suluclac
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Today,
08:54
greg1313
replied to a thread
Evaluate Case of Fresnel Integral
in
Analysis
It seems Wolfram Alpha uses a different version of the Fresnel C integral. The limit, as given there, is $\frac12$.
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3 replies | 33 view(s)
Today,
04:42
MarkFL
replied to a thread
BBCode For Username HTML Markup
in
vBulletin Products
Update - Version 1.3: SEO friendly links to user profiles. vBulletin's intrinsic username markup function used. Username matching is now...
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1 replies | 48 view(s)
Today,
00:02
greg1313
replied to a thread
Prove a number is divisible by a number?
in
Number Theory
Ah, so in general $(x^k-1)\equiv0\pmod{x-1}$.
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7 replies | 84 view(s)
Yesterday,
23:12
greg1313
replied to a thread
Prove a number is divisible by a number?
in
Number Theory
Hi I like Serena. Could you give a detailed explanation?
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7 replies | 84 view(s)
Yesterday,
22:53
MarkFL
replied to a thread
Prove a number is divisible by a number?
in
Number Theory
Another approach would be to use the binomial theorem: 7^n-1=(6+1)^n-1=6\sum_{k=1}^{n}\left({n \choose k}6^{k-1}\right)
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7 replies | 84 view(s)
Yesterday,
18:37
greg1313
replied to a thread
AlphaZero Crushes Chess
in
Chat Room
...which leads me to the question "Can we construct an algorithm that, given the rules of math, teaches itself math and consequently arrives at...
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3 replies | 51 view(s)
Yesterday,
17:32
greg1313
replied to a thread
prove limit with convergence tests
in
Calculus
It looks like question 2 has a typo.
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2 replies | 41 view(s)
Yesterday,
14:51
MarkFL
replied to a thread
AlphaZero Crushes Chess
in
Chat Room
That's amazing! (Yes)
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3 replies | 51 view(s)
Yesterday,
14:38
MarkFL
replied to a thread
limit of a series
in
Calculus
As suggested, I would continue on your current path, but I wanted to show how I would approach the problem... I would begin by expressing the...
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3 replies | 48 view(s)
Yesterday,
11:59
MarkFL
replied to a thread
Need help with reversal of a calculation involving gravitational constant.
in
Pre-Algebra and Algebra
It's actually: G=\frac{rV_e^2}{2M}
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6 replies | 70 view(s)
Yesterday,
01:55
MarkFL
replied to a thread
Revenue and Cost and Profit Problem
in
Business Mathematics
To follow up: The axis of symmetry is: x=-\frac{48}{2(-2)}=12 We see that the profit function opens downward, and so the vertex is the...
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4 replies | 46 view(s)
December 10th, 2017,
12:30
MarkFL
replied to a thread
Revenue and Cost and Profit Problem
in
Business Mathematics
Another approach would be to express your profit function in vertex form: P(x)=-a(x-h)^2+k where: P_{\max}=k
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4 replies | 46 view(s)
December 10th, 2017,
00:57
MarkFL
replied to a thread
Revenue and Cost and Profit Problem
in
Business Mathematics
Your profit function is correct: P(x)=-2x^2+48x-108 Now, what I would do is find the axis of symmetry (since the vertex lies on this...
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4 replies | 46 view(s)
December 10th, 2017,
00:37
greg1313
replied to a thread
Firefox Quantum
in
Chat Room
Vivaldi's nice, methinks! ;)
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9 replies | 217 view(s)
December 10th, 2017,
00:27
greg1313
replied to a thread
Need help with reversal of a calculation involving gravitational constant.
in
Pre-Algebra and Algebra
$$V_e=\sqrt{\frac{2GM}{r}}$$ $$V_e=\left(\frac{2GM}{r}\right)^{1/2}$$ ...
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6 replies | 70 view(s)
December 9th, 2017,
17:06
MarkFL
replied to a thread
m2215b.14 Find the limiting velocity
in
Calculus
If the hyperbolic tangent factor goes to 1, then the terminal velocity $v_T$ must be: v_T=\sqrt{\frac{mg}{k}} Dimensional analysis shows that...
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13 replies | 165 view(s)
December 9th, 2017,
15:05
MarkFL
replied to a thread
m2215b.14 Find the limiting velocity
in
Calculus
Yes, and so what does this tell you about the terminal velocity?
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13 replies | 165 view(s)
December 9th, 2017,
08:12
MarkFL
replied to a thread
Need help with reversal of a calculation involving gravitational constant.
in
Pre-Algebra and Algebra
Hello, and welcome to MHB, Edwin! (Wave) We are given: V_e=\sqrt{\frac{2GM}{r}} What do we get if we square both sides of the equation?
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6 replies | 70 view(s)
December 8th, 2017,
20:46
greg1313
replied to a thread
Firefox Quantum
in
Chat Room
Sometimes this process listed as "Web Content" in my ps table shows up, chewing up about 90% CPU usage and a large (about 60%) chunk of my RAM. Other...
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9 replies | 217 view(s)
December 8th, 2017,
20:08
MarkFL
replied to a thread
m2215b.14 Find the limiting velocity
in
Calculus
Yes, so what's the limit: \lim_{u\to\infty}\tanh(u)\,?
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13 replies | 165 view(s)
December 8th, 2017,
02:39
MarkFL
replied to a thread [SOLVED]
M2215b.08 Find the volume of the solid (shell meithod)
in
Calculus
Let's check your result using the washer method: V=\pi\left(\int_0^{\sin\left(\frac{\pi^2}{4}\right)}...
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8 replies | 97 view(s)
December 7th, 2017,
22:14
MarkFL
replied to a thread [SOLVED]
M2215b.08 Find the volume of the solid (shell meithod)
in
Calculus
You originally had the integrand correct, but when you corrected the limits, you changed the integrand such that the integral was still incorrect...
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8 replies | 97 view(s)
December 7th, 2017,
17:54
MarkFL
replied to a thread [SOLVED]
M2215b.08 Find the volume of the solid (shell meithod)
in
Calculus
Now, reverse the change you made to the integrand...
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8 replies | 97 view(s)
December 7th, 2017,
17:49
MarkFL
replied to a thread [SOLVED]
M2215b.08 Find the volume of the solid (shell meithod)
in
Calculus
Examine your limits of integration more closely...:)
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8 replies | 97 view(s)
December 7th, 2017,
14:28
MarkFL
replied to a thread
m2215b.14 Find the limiting velocity
in
Calculus
No, I was thinking more along the lines of: \tanh(u)\equiv\frac{e^{u}-e^{-u}}{e^{u}+e^{-u}} What happens if you multiply that by: ...
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13 replies | 165 view(s)
December 7th, 2017,
13:44
MarkFL
replied to a thread
m2215b.14 Find the limiting velocity
in
Calculus
Okay, now the given velocity function is dimensionally consistent, given that $k$ has units of mass per length (can you demonstrate this?). In...
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13 replies | 165 view(s)
December 7th, 2017,
13:29
MarkFL
replied to a thread
Require Edit Reason
in
vBulletin Products
Update - Version 1.3: Add ability to exempt all usergroups from being required to edit, to allow for the setting of pre-defined edit reasons...
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1 replies | 65 view(s)
December 7th, 2017,
05:11
greg1313
replied to a thread
m2215b.14 Find the limiting velocity
in
Calculus
Where is $t$?
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13 replies | 165 view(s)
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