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On Sunday, October 6, 2019 at 4:10:15 PM UTC-4, bitrex wrote:
On 10/5/19 8:06 PM, Whoey Louie wrote:
On Saturday, October 5, 2019 at 6:22:50 PM UTC-4, blo...@columbus.rr.com wrote:
Diagram 1. The field coming out of a charged particle. So there are 16 arrows coming out of a dot on the center of the page ( or 8 or 24 depending on the book). This is what an electric field looks like on a charged particle. Of course the new student does not know what a field is . the correct diagram would be a black smudge across the entire page because that might give some clue to the student that the field is everywhere. The notion that the field is everywhere is not such a trivial concept and the diagram that shows 16 arrows somehow does not really drive that point home.
IDK, worked OK for me. Kind of like the sun, or a hot body radiating.
I didn't think because there were arrows that ended on a simple diagram
that it meant the field just ended there instead of extending outward
everywhere. It sure seems a lot better than a smudge across the whole page.
they can print images in textbooks in color these days!
https://en.wikipedia.org/wiki/Electric_potential#/media/File:VFPt_metal_balls_plusminus_potential.svg
The "heat map" shows the electrostatic potential, and then the E-field
lines on top
I wonder if that makes the OP happy? It's certainly way better that a smudge.
Diagram 2. The fourier series of a square wave that has odd symmetry --- so the answer is all sin waves. OK the whole purpose of the fourier series is to teach that any repetitive signal can be broken into sine components and cosine components. SIN and COS ---(anybody listening?). So the first problem they show the student is the case where the cos waves are miraculously missing. Isn't the whole point to show that you need sin and cos components to faithfully make a repetitive waveform and the first thing you do is hide the cos waves????- WTF
Diagram 3. The 3dB overshoot diagram for a "perfect" control loop. In my experience , the perfect control loop is the slowest , most overdamped loop that you can build that is responsive enough to get the job done.
On Sunday, October 6, 2019 at 4:10:15 PM UTC-4, bitrex wrote:
On 10/5/19 8:06 PM, Whoey Louie wrote:
On Saturday, October 5, 2019 at 6:22:50 PM UTC-4, blo...@columbus.rr.com wrote:
Diagram 1. The field coming out of a charged particle. So there are 16 arrows coming out of a dot on the center of the page ( or 8 or 24 depending on the book). This is what an electric field looks like on a charged particle. Of course the new student does not know what a field is . the correct diagram would be a black smudge across the entire page because that might give some clue to the student that the field is everywhere. The notion that the field is everywhere is not such a trivial concept and the diagram that shows 16 arrows somehow does not really drive that point home.
IDK, worked OK for me. Kind of like the sun, or a hot body radiating..
I didn't think because there were arrows that ended on a simple diagram
that it meant the field just ended there instead of extending outward
everywhere. It sure seems a lot better than a smudge across the whole page.
they can print images in textbooks in color these days!
https://en.wikipedia.org/wiki/Electric_potential#/media/File:VFPt_metal_balls_plusminus_potential.svg
The "heat map" shows the electrostatic potential, and then the E-field
lines on top
I wonder if that makes the OP happy? It's certainly way better that a smudge.
Diagram 2. The fourier series of a square wave that has odd symmetry --- so the answer is all sin waves. OK the whole purpose of the fourier series is to teach that any repetitive signal can be broken into sine components and cosine components. SIN and COS ---(anybody listening?). So the first problem they show the student is the case where the cos waves are miraculously missing. Isn't the whole point to show that you need sin and cos components to faithfully make a repetitive waveform and the first thing you do is hide the cos waves????- WTF
Diagram 3. The 3dB overshoot diagram for a "perfect" control loop. In my experience , the perfect control loop is the slowest , most overdamped loop that you can build that is responsive enough to get the job done.
On Saturday, October 5, 2019 at 6:22:50 PM UTC-4, blo...@columbus.rr.com wrote:
Diagram 1. The field coming out of a charged particle. So there are 16 arrows coming out of a dot on the center of the page ( or 8 or 24 depending on the book). This is what an electric field looks like on a charged particle. Of course the new student does not know what a field is . the correct diagram would be a black smudge across the entire page because that might give some clue to the student that the field is everywhere. The notion that the field is everywhere is not such a trivial concept and the diagram that shows 16 arrows somehow does not really drive that point home.
The field does not come out of a point charge. It just is. The analogy with sun is flawed because the sun radiates energy, the point charge does not.. All the coordinates and field components are spherical. Drawing a picture in 2D is worthless.
Diagram 2. The fourier series of a square wave that has odd symmetry --- so the answer is all sin waves. OK the whole purpose of the fourier series is to teach that any repetitive signal can be broken into sine components and cosine components. SIN and COS ---(anybody listening?). So the first problem they show the student is the case where the cos waves are miraculously missing. Isn't the whole point to show that you need sin and cos components to faithfully make a repetitive waveform and the first thing you do is hide the cos waves????- WTF
Dunno how the cos waves are miraculously missing. You can show that the series coefficients, derived through integration of the cos x function product over a period, are zero.
Diagram 3. The 3dB overshoot diagram for a "perfect" control loop. In my experience , the perfect control loop is the slowest , most overdamped loop that you can build that is responsive enough to get the job done.
A piece of crap response like that usually has trouble following simple inputs. You're thinking of junk from 40 years ago, the slide rule days, when it was big deal to play with second order systems.
On Sunday, October 6, 2019 at 10:02:44 AM UTC+11, blo...@columbus.rr.com wrote:
On Saturday, October 5, 2019 at 6:58:39 PM UTC-4, bitrex wrote:
On 10/5/19 6:44 PM, blocher@columbus.rr.com wrote:
On Saturday, October 5, 2019 at 6:34:52 PM UTC-4, bitrex wrote:
On 10/5/19 6:22 PM, blocher@columbus.rr.com wrote:
Diagram 1. The field coming out of a charged particle. So there are 16 arrows coming out of a dot on the center of the page ( or 8 or 24 depending on the book). This is what an electric field looks like on a charged particle. Of course the new student does not know what a field is . the correct diagram would be a black smudge across the entire page because that might give some clue to the student that the field is everywhere. The notion that the field is everywhere is not such a trivial concept and the diagram that shows 16 arrows somehow does not really drive that point home.
The electric field is a vector field, it has a magnitude and a direction
associated with every point in space. It's the gradient of the
electrostatic potential, which could be represented by an intensity plot
for all space.
Diagram 2. The fourier series of a square wave that has odd symmetry --- so the answer is all sin waves. OK the whole purpose of the fourier series is to teach that any repetitive signal can be broken into sine components and cosine components. SIN and COS ---(anybody listening?). So the first problem they show the student is the case where the cos waves are miraculously missing. Isn't the whole point to show that you need sin and cos components to faithfully make a repetitive waveform and the first thing you do is hide the cos waves????- WTF
Diagram 3. The 3dB overshoot diagram for a "perfect" control loop. In my experience , the perfect control loop is the slowest , most overdamped loop that you can build that is responsive enough to get the job done..
I think my prof said the exact same thing to me years ago.
How do you represent a vector field with a smudge and got no vectors?
The point is that every point on the page needs an arrow. If you draw an arrow on every point on the page you get a black smudge across the page. A black smudge would be just as instructive as the 16 arrows from a charged point.
Wrong. The black smudge has only magnitiude. Vectors have direction and length, which is a distinction you can capture with arrows.
The vector field is also continuous, but representing that on a flat page while capturing the magnitude and direction features is a bit tricky.
The aim is to instil mathematical insight, and the arrows don't get in the way of that.
--
Bill Sloman, Sydney
Diagram 1. The field coming out of a charged particle. So there are 16 arrows coming out of a dot on the center of the page ( or 8 or 24 depending on the book). This is what an electric field looks like on a charged particle. Of course the new student does not know what a field is . the correct diagram would be a black smudge across the entire page because that might give some clue to the student that the field is everywhere. The notion that the field is everywhere is not such a trivial concept and the diagram that shows 16 arrows somehow does not really drive that point home.
Diagram 2. The fourier series of a square wave that has odd symmetry --- so the answer is all sin waves. OK the whole purpose of the fourier series is to teach that any repetitive signal can be broken into sine components and cosine components. SIN and COS ---(anybody listening?). So the first problem they show the student is the case where the cos waves are miraculously missing. Isn't the whole point to show that you need sin and cos components to faithfully make a repetitive waveform and the first thing you do is hide the cos waves????- WTF
Diagram 3. The 3dB overshoot diagram for a "perfect" control loop. In my experience , the perfect control loop is the slowest , most overdamped loop that you can build that is responsive enough to get the job done.
On Saturday, October 5, 2019 at 10:47:56 PM UTC-4, Bill Sloman wrote:
On Sunday, October 6, 2019 at 10:02:44 AM UTC+11, blo...@columbus.rr.com wrote:
On Saturday, October 5, 2019 at 6:58:39 PM UTC-4, bitrex wrote:
On 10/5/19 6:44 PM, blocher@columbus.rr.com wrote:
On Saturday, October 5, 2019 at 6:34:52 PM UTC-4, bitrex wrote:
On 10/5/19 6:22 PM, blocher@columbus.rr.com wrote:
Diagram 1. The field coming out of a charged particle. So there are 16 arrows coming out of a dot on the center of the page ( or 8 or 24 depending on the book). This is what an electric field looks like on a charged particle. Of course the new student does not know what a field is . the correct diagram would be a black smudge across the entire page because that might give some clue to the student that the field is everywhere. The notion that the field is everywhere is not such a trivial concept and the diagram that shows 16 arrows somehow does not really drive that point home.
The electric field is a vector field, it has a magnitude and a direction
associated with every point in space. It's the gradient of the
electrostatic potential, which could be represented by an intensity plot
for all space.
Diagram 2. The fourier series of a square wave that has odd symmetry --- so the answer is all sin waves. OK the whole purpose of the fourier series is to teach that any repetitive signal can be broken into sine components and cosine components. SIN and COS ---(anybody listening?). So the first problem they show the student is the case where the cos waves are miraculously missing. Isn't the whole point to show that you need sin and cos components to faithfully make a repetitive waveform and the first thing you do is hide the cos waves????- WTF
Diagram 3. The 3dB overshoot diagram for a "perfect" control loop. In my experience , the perfect control loop is the slowest , most overdamped loop that you can build that is responsive enough to get the job done.
I think my prof said the exact same thing to me years ago.
How do you represent a vector field with a smudge and got no vectors?
The point is that every point on the page needs an arrow. If you draw an arrow on every point on the page you get a black smudge across the page. A black smudge would be just as instructive as the 16 arrows from a charged point.
Wrong. The black smudge has only magnitiude. Vectors have direction and length, which is a distinction you can capture with arrows.
The vector field is also continuous, but representing that on a flat page while capturing the magnitude and direction features is a bit tricky.
The aim is to instil mathematical insight, and the arrows don't get in the way of that.
Maybe you can get a better handle on this by consulting with that sorry ass weakling fuck nobody pedophile buddy of yours.
blocher@columbus.rr.com wrote:
Diagram 1. The field coming out of a charged particle. So there are 16 arrows coming out of a dot on the center of the page ( or 8 or 24 depending on the book). This is what an electric field looks like on a charged particle. Of course the new student does not know what a field is . the correct diagram would be a black smudge across the entire page because that might give some clue to the student that the field is everywhere. The notion that the field is everywhere is not such a trivial concept and the diagram that shows 16 arrows somehow does not really drive that point home.
Diagram 2. The fourier series of a square wave that has odd symmetry --- so the answer is all sin waves. OK the whole purpose of the fourier series is to teach that any repetitive signal can be broken into sine components and cosine components. SIN and COS ---(anybody listening?). So the first problem they show the student is the case where the cos waves are miraculously missing. Isn't the whole point to show that you need sin and cos components to faithfully make a repetitive waveform and the first thing you do is hide the cos waves????- WTF
Diagram 3. The 3dB overshoot diagram for a "perfect" control loop. In my experience , the perfect control loop is the slowest , most overdamped loop that you can build that is responsive enough to get the job done.
Ever heard of critical damping? There is slight overshoot..
Electrons?On Sat, 05 Oct 2019 20:32:15 -0400, Tom Del Rosso wrote:
And everyone, regardless of education, knows a bunch of arrows
represents motion or force that is not limited to the boundaries of the
arrows but includes the space between them.
Sorry, but a bunch of arrows indicates the movement of electrons towards
areas of positive or partially-positive charge between the steps of a
chemical reaction.
See the issue with sweeping generalisations? ;-
On Sat, 05 Oct 2019 20:32:15 -0400, Tom Del Rosso wrote:
And everyone, regardless of education, knows a bunch of arrows
represents motion or force that is not limited to the boundaries of
the arrows but includes the space between them.
Sorry, but a bunch of arrows indicates the movement of electrons
towards areas of positive or partially-positive charge between the
steps of a chemical reaction.
See the issue with sweeping generalisations? ;-