SuzukiSavage.com - Super Powers...

Serowbot YaBB Moderator ModSquad Offline OK.... so what's the speed of dark? Posts: 29301 Tucson Az Gender:	Super Powers... 08/29/12 at 11:27:30 Well,.. they don't all make superheros,... but it's pretty cool... ... and it's another waste of 2 min of yer' life... ... ...
Back to top	Ludicrous Speed !... ... ... IP Logged

gerald.hughes Serious Thumper ModSquad Offline FSO Posts: 1100 Tucson, Az Gender:	Re: Super Powers... Reply #1 - 08/29/12 at 13:26:00 So, how does he manage to draw dotted lines with a piece of chalk?
Back to top	IP Logged

bill67 Serious Thumper Offline old tired Posts: 8517 genoa city wisconsin Gender:	Re: Super Powers... Reply #2 - 08/29/12 at 13:44:39 He is pretty smart,He got the answers really fast.
Back to top	william h krumpen IP Logged

justin_o_guy2 Serious Thumper Offline What happened? Posts: 55279 East Texas, 1/2 dallas/la.	Re: Super Powers... Reply #3 - 08/29/12 at 16:09:00 gerald.hughes wrote on 08/29/12 at 13:26:00: So, how does he manage to draw dotted lines with a piece of chalk? He pushes it at an angle that makes it chatter.
Back to top	The people never give up their liberties but under some delusion.- Edmund Burke. IP Logged

Paraquat Serious Thumper Offline SuzukiSavage.com Rocks! Posts: 2206	Re: Super Powers... Reply #4 - 08/29/12 at 16:17:33 I bet his wife loves him. --Steve
Back to top	IP Logged

ToesNose Serious Thumper Offline Pardon me, do you have Hot Sauce? Posts: 1993 Mooresville, NC Gender:	Re: Super Powers... Reply #5 - 08/29/12 at 22:10:28 Thanks Serowbot, that's just what I needed to help me go to sleep
Back to top	The Suzuki LS650, bringing Miles of Smiles everywhere! IP Logged

justin_o_guy2 Serious Thumper Offline What happened? Posts: 55279 East Texas, 1/2 dallas/la.	Re: Super Powers... Reply #6 - 08/29/12 at 22:16:40 I have a math problem Ive never even tried to solve. A tire, rolling at 60 MPH, top of the tire is moving forward at 120 MPH, bottom, zero. Put a dot on the tire & graph its speed thru one revolution. Is that gonna be a sine wave? How different would the graph look with different tire diameters?
Back to top	The people never give up their liberties but under some delusion.- Edmund Burke. IP Logged

Serowbot

YaBB Moderator
ModSquad

Offline

OK.... so what's the
speed of dark?

Posts: 29301
Tucson Az
Gender: male

Re: Super Powers...
Reply #7 - 08/29/12 at 22:49:42

justin_o_guy2 wrote on 08/29/12 at 22:16:40:

I have a math problem Ive never even tried to solve.

A tire, rolling at 60 MPH, top of the tire is moving forward at 120 MPH, bottom, zero. Put a dot on the tire & graph its speed thru one revolution.
Is that gonna be a sine wave?
How different would the graph look with different tire diameters?

Nope,... straight as an arrow,.. but you'll end up with an 172ft long tire...
Prolly kinda' skinny... Huh

...

Back to top

Ludicrous Speed !... ... Huh

...

IP Logged

justin_o_guy2 Serious Thumper Offline What happened? Posts: 55279 East Texas, 1/2 dallas/la.	Re: Super Powers... Reply #8 - 08/29/12 at 23:21:34 The speed goes from zero to 120 mph & back to zero. The forward progress of that dot,, at the top & bottom, I can get it, at 90* on either side of the axle, 60 MPH, but that spot, the first few degrees as the dot comes up off the asphalt really gets me,
Back to top	The people never give up their liberties but under some delusion.- Edmund Burke. IP Logged

Cavi Mike

Serious Thumper

Offline

Thumper n00b

Posts: 1005
Rochester, NY
Gender: male

Re: Super Powers...
Reply #9 - 08/30/12 at 04:47:26

It will look like more like an AC wave that's been rectified but not a rectified sine wave either. In a rectified sine wave the "dot" is moving its fastest as it's approaching zero and slowest at its peak. It's the opposite in the weird wave you described - it's moving fastest at its peak and slowest at zero. It will look more like a lower-case 'm' than a rectified sine-wave.

Back to top

IP Logged

justin_o_guy2 Serious Thumper Offline What happened? Posts: 55279 East Texas, 1/2 dallas/la.	Re: Super Powers... Reply #10 - 08/30/12 at 07:37:24 mmmmmmmm Yea,, it would, woodnitt? But where my head gets all scrambled is in the area where the dot is just coming up off the asphalt. Im really not following the rectified thing.. in school, after an ac wave went thru a rectumfrier it came out flat,
Back to top	The people never give up their liberties but under some delusion.- Edmund Burke. IP Logged

Serowbot

YaBB Moderator
ModSquad

Offline

OK.... so what's the
speed of dark?

Posts: 29301
Tucson Az
Gender: male

Re: Super Powers...
Reply #11 - 08/30/12 at 08:10:00

justin_o_guy2 wrote on 08/29/12 at 22:16:40:

I have a math problem Ive never even tried to solve.

A tire, rolling at 60 MPH, top of the tire is moving forward at 120 MPH, bottom, zero. Put a dot on the tire & graph its speed thru one revolution.
Is that gonna be a sine wave?
How different would the graph look with different tire diameters?

JOG,... I'm missing something here...
If the top is moving 120mph, and the bottom zero,... the tire will never make one revolution, because the bottom isn't moving...
The tire isn't rotating,.. it's stretching... Huh

...

Back to top

Ludicrous Speed !... ... Huh

...

IP Logged

Charon

Serious Thumper

Offline

Posts: 1811
Harvard, NE
Gender: male

Re: Super Powers...
Reply #12 - 09/02/12 at 15:16:53

The curve is called a cycloid, or a cycloidal wave.

The AC sine wave, having passed through a half-wave rectifier, is a series of pulses interspersed with gaps of length equal to the pulses, each one half of a sine wave. Through a full-wave rectifier, it looks as if the "bottom" half of the sine wave was inverted and you get a series of pulses. It doesn't become "flat" until the power supply filter (usually a capacitor) acts on it.

Back to top

Eschew obfuscation.

IP Logged

justin_o_guy2 Serious Thumper Offline What happened? Posts: 55279 East Texas, 1/2 dallas/la.	Re: Super Powers... Reply #13 - 09/03/12 at 03:01:42 Thanks Charon. Look what I learned,, thats cool, http://www.scitechantiques.com/cycloidhtml/ Drop a ball on a ramp & one on a cycloid ramp & the one that falls on the longer, curved ramp gets to the bottom first.
Back to top	The people never give up their liberties but under some delusion.- Edmund Burke. IP Logged

Paraquat Serious Thumper Offline SuzukiSavage.com Rocks! Posts: 2206	Re: Super Powers... Reply #14 - 09/03/12 at 06:55:12 That's actually really interesting. --Steve
Back to top	IP Logged