Math Is Fun Forum

  Discussion about math, puzzles, games and fun.   Useful symbols: ÷ × ½ √ ∞ ≠ ≤ ≥ ≈ ⇒ ± ∈ Δ θ ∴ ∑ ∫ • π ƒ -¹ ² ³ °

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#1351 Re: Dark Discussions at Cafe Infinity » Please Help me... » 2013-05-29 01:35:26

I think it is not him but an impersonator.

#1352 Re: Dark Discussions at Cafe Infinity » Please Help me... » 2013-05-29 01:31:32

Yes, I watch them with my family everyday.

#1353 Re: Dark Discussions at Cafe Infinity » Please Help me... » 2013-05-29 01:29:43

Hi; I watched the show Jyoti and he was in it.

#1355 Help Me ! » A real tough one. » 2013-05-29 00:37:20

ShivamS
Replies: 2

Find the flux of the vector field F(x,y,z) = (e^-y) i - (y) j + (x sinz) k across σ wit outward orientation where σ is the portion of the elliptic cylinder r(u,v) = (2cos v) i + (sin v) j + (u) k with 0 ≤ u ≤ 5, 0 ≤ v ≤ 2pi.

#1356 Re: Introductions » Well, hello there. » 2013-05-29 00:25:55

Bobbym, when did she hint that she doesn't like the outdoors? Anyways, welcome to the forum.

#1357 Re: Help Me ! » basic calculus » 2013-05-29 00:17:41

I like "Calculus Made Easy" but Martin needs to do a bit more renovation again. His methodology (Thompson's) is quite good but he doesn't cover the geometrical meaning of a derivative until much later. And I would really like to remove some of Liebniz's notation into f'. Also, as a guy pursuing a doctorate in physics, much more then basic calculus is required. Look at this problem for example:

An object with weight W is dragged along a horizontal plane by a force acting along a rope attached to the object. If the rope makes an angle θ with the plane, then the magnitude of the force is given by the following equation, where μ is a constant called the coefficient of friction.

F = (muW)/(mu sin(theta) + cos(theta))

(a) Find the rate of change of F with respect to θ. (Use mu for μ and theta for θ as necessary.)
(b) When is this rate of change equal to 0? (Use mu for μ and theta for θ as necessary.)
(c) If W = 40 lbs and μ = 0.6, draw the graph of F as a function of θ and use it to locate the value of θ for which dF / dθ = 0. (Round the answer to two decimal places).

Physics, analytical chemistry (which is heavily reliant on stats), biology and comp.sci all require basic calculus  knowledge at the start. Later though, a through knowledge of calculus will be almost certainly required. Then again, don't think of calculus as an extremely difficult discipline. It is just a very abstract concept which may take some getting used to. The MIF tutorials on it are just great, but if you need some more visual help you should check out Sal's videos.  Also, bobbym, you have been doing calculus since you were around 6?

#1358 Re: Help Me ! » Single-var Calculus (and otherwise) » 2013-05-27 00:37:55

I just messed up on a vector calculus question (carrying 4 marks) which was, according to me, the hardest question on the exam. Funny thing is, after I went to my dorm, I solved it in less than 15 minutes.

#1360 Re: Help Me ! » Single-var Calculus (and otherwise) » 2013-05-27 00:29:46

Thanks a lot Stefy; the midterm exam went extremely well.

#1361 Re: Dark Discussions at Cafe Infinity » This man in purple....... » 2013-05-27 00:26:16

7/3, were you born in Bangladesh? And Agnishom, are you in Kolkota/Calcutta?

#1362 Re: Formulas » Discussions About The Formulas » 2013-05-24 01:45:37

Barbie's profile says she has 2 posts, when she only has one. And chemistry is very interesting (yet my least favorite science).

#1363 Re: Dark Discussions at Cafe Infinity » What the heck is this?? » 2013-05-24 01:06:04

Oh, okay. And I would say your life is much better then the Micro%oft guys.

#1364 Re: Puzzles and Games » Abbreviations and full names » 2013-05-24 01:02:43

Shivamcoder3013 wrote:

British Broadcasting Corporation?

#1365 Re: Dark Discussions at Cafe Infinity » What the heck is this?? » 2013-05-24 00:57:34

No no; what I mean is simply using some of the features on the website such as the number line, give full credit to MIF and refer people to MIF's site for extra support.

#1367 Re: Dark Discussions at Cafe Infinity » What the heck is this?? » 2013-05-24 00:49:45

Of curse I will do that, but I won't be filed a lawsuit against?

#1368 Re: Dark Discussions at Cafe Infinity » What the heck is this?? » 2013-05-24 00:45:10

MIF's. Of course I will ask him beforehand.

#1369 Re: Puzzles and Games » Abbreviations and full names » 2013-05-24 00:42:17

So now we wait for JTM to check and then we or him post a new word.

#1370 Re: Dark Discussions at Cafe Infinity » What the heck is this?? » 2013-05-24 00:38:25

But he hasn't posted in over one year? And I was just wondering if I can use some of the site's material for my videos.

#1372 Re: Dark Discussions at Cafe Infinity » What the heck is this?? » 2013-05-24 00:17:59

Sorry for digging this up, but are we allowed to do this if we provide credit to MIF?

#1373 Re: Help Me ! » Single-var Calculus (and otherwise) » 2013-05-24 00:10:37

http://en.wikipedia.org/wiki/Vector_potential

But thank-you anyways.

#1374 Re: Puzzles and Games » Can you suggest six names of great mathematicians quickly? » 2013-05-23 00:39:45

I didn't realize CBSE utilized the GPA grading scale. Anyways, are you one of the national toppers for grade 9?

#1375 Re: Introductions » introduction » 2013-05-23 00:30:16

Hi Mike, hope you have a great time here.

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