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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#1 Re: Maths Is Fun - Suggestions and Comments » Electricity » 2016-11-27 22:22:18

bob bundy wrote:

Hi MathsIsFun,

This page looks excellent to me.  Had to cover a physics lesson once, so, instead of copying from books, I got out the Van de Graaff generator.  The effect on washed, fine hair is 'shocking!'.

Bob

Pics please smile

#2 Re: Maths Is Fun - Suggestions and Comments » Electricity » 2016-11-27 22:21:45

bobbym wrote:

It might take an individual electron more than a month to make the trip due to innumerable collisions.

I should mention that!

#3 Re: Maths Is Fun - Suggestions and Comments » Electricity » 2016-11-27 12:00:25

I have read that if you are caught outdoors during lightning you should squat down, feet  together,  with head tucked in.

#4 Maths Is Fun - Suggestions and Comments » Electricity » 2016-11-27 09:31:05

MathsIsFun
Replies: 9

A new page: Electricity

Please check it over for accuracy, etc!

#5 Re: Help Me ! » Review » 2016-09-03 10:37:55

Compuhigh.com have asked that we remove this topic "in order to ameliorate the harm to later students who may find the question and answer in an internet search".

I have responded to them "I am awaiting permission from two forum members ... seems a shame as the student was very engaged in the process and learned a lot with members help, as would others visiting the page. There are likely to be many places on the internet (facebook, reddit, etc) where your students will find answers to previous questions, it seems easier to simply change your questions (even a little) every year."

Ignoring many arguments (and a heavy heart), it simply seems like a nice gesture to Compuhigh to remove it.

With your permission anonimnystefy and bob?

#6 Re: Maths Is Fun - Suggestions and Comments » Inverse Functions » 2016-07-30 11:49:31

Thanks everyone!

I will leave the page as it is until I can think of a way to simplify it without straying into "y=2x+3 becomes y=(x-3)/2" territory.

#7 Re: Maths Is Fun - Suggestions and Comments » Inverse Functions » 2016-07-29 10:59:44

The "graphing calculator" reasoning might be why Wolfram (ie Mathematica) uses  f-¹(x)

#8 Re: Maths Is Fun - Suggestions and Comments » Inverse Functions » 2016-07-29 09:57:14

Thanks Guys!

I found Wolfram uses f-¹(x): http://mathworld.wolfram.com/InverseFunction.html

It would be nice to simplify the page to f-¹(x) ... but in the intro I say "So the inverse of:   2x+3   is:   (y-3)/2" and that does not sit well with using f-¹(x)

Nor with the table of inverses as ganesh mentions.

#9 Maths Is Fun - Suggestions and Comments » Inverse Functions » 2016-07-28 13:34:46

MathsIsFun
Replies: 10

On this page: Inverse Functions

I have f(x) becoming f-¹(y)

But a reader has suggested it should be f-¹(x)   

It would certainly be simpler not swapping y for x. What is correct do you think?

#10 Re: Maths Is Fun - Suggestions and Comments » Reflection » 2016-07-27 17:32:54

bobbym wrote:

... and since I have no spoon that shiny ...

I polished it specially for the occasion!

I will mention The law of reflection, thanks ganesh.

#12 Re: Maths Is Fun - Suggestions and Comments » Sound Waves » 2016-07-26 22:37:46

I might put the typical hearing sensitivity graph just below the sound generator so people don't freak out though!

#13 Re: Maths Is Fun - Suggestions and Comments » Sound Waves » 2016-07-26 10:45:29

Thanks everyone! Excellent hearing, bobbym.

You may be in Internet Explorer, bob, it does not have a thing called "AudioContext" so my code doesn't make any sound.

#14 Maths Is Fun - Suggestions and Comments » Sound Waves » 2016-07-25 20:50:53

MathsIsFun
Replies: 6

Another in the Waves series: Sound Waves

Let me know any Suggestions and Comments

#16 Maths Is Fun - Suggestions and Comments » Introduction to Waves » 2016-07-25 10:28:22

MathsIsFun
Replies: 4

A new page for you guys to review: Introduction to Waves

(I have been working on a lot of pages on waves, this is the first.)

Comments, suggestions please.

#17 Re: Maths Is Fun - Suggestions and Comments » Types of Force » 2016-05-21 20:29:27

Thanks bobby and ganesh.

And bobby: the Romans were just that good. Great roads, too. But apart from concrete and roads what have they ever done for us?

#18 Maths Is Fun - Suggestions and Comments » Types of Force » 2016-05-20 19:27:05

MathsIsFun
Replies: 3

Another page for everyone to check out: Types of Force

Comments/suggestions welcome

#24 Re: Maths Is Fun - Suggestions and Comments » Gravity » 2016-04-16 13:34:21

I was thinking of a popup edit screen, one line per object, with mass, x and y position and velocity magnitude and direction (0-360 degrees). The animation would pause while editing. Can also delete a particle.

#25 Maths Is Fun - Suggestions and Comments » Gravity » 2016-04-13 17:52:15

MathsIsFun
Replies: 7

A new page on Gravity

Would value your feedback.

Any ideas on how to best present space-time curvature will be welcome!

Also help in tightening up the wording is welcome, too.

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