Parts Catalog Accessories Catalog How To Articles Tech Forums
Call Pelican Parts at 888-280-7799
Shopping Cart Cart | Project List | Order Status | Help



Go Back   PeachParts Mercedes-Benz Forum > General Discussions > Off-Topic Discussion

Reply
 
LinkBack Thread Tools Display Modes
  #1  
Old 05-04-2008, 09:30 AM
Kuan's Avatar
unband
 
Join Date: Jan 2001
Location: At the Birkebeiner
Posts: 3,811
Physicists Explain This!

http://www.youtube.com/watch?v=W1TMZASCR-I

__________________
You don't need a weatherman to know which way the wind blows - Robert A. Zimmerman
Reply With Quote
  #2  
Old 05-04-2008, 10:14 AM
powerpig's Avatar
In Memory of the Sam Man
 
Join Date: Feb 2006
Location: Guntersville, AL
Posts: 649
Easy although I'm not an expert. When placed on the cans, the motion created causes them to sync up. Something to do with perpetual motion.
__________________
99 ML320
94 SL600
92 SL500
95 E320 Cabriolet
87 560SEC
86 300SDL Grease Car
80 380SLC Euro

13 Fiat Abarth
02 Maserati Spyder Cambiocorsa
00 BMW Z3
90 Rolls Royce Silver Spur
80 Ferrari 308 GTSI
88 Jaguar XJS12 H&E Edition
99 Land Rover Discovery
Reply With Quote
  #3  
Old 05-04-2008, 10:26 AM
Botnst's Avatar
What knockers!
 
Join Date: Jun 2003
Location: There castle.
Posts: 40,775
That's what I think, too PP.

The cans allow the mean of the pendulum energy to exactly balance at some harmonic, shifting it from periodic motion to linear motion.
Sum(T)=sum(2(pi)(L/G)^1/2) = - m/2 v^2

That term on the right side is negative to indicate equal and opposite. But there is still potential energy stuffed away in the instantaneous pendulum positions and so, the pendulums do not freeze in place. Instead, they continue their motion but reduced by the loss of kinetic periodic motion to kinetic linear.

Just when the pendulums thought it was safe to resume swinging, they hit another mean harmonic and again, get reduced.

Each time the harmonic is reached the KE is reduced. The pendulum most out-of-phase is most affected, it absorbs some of the KE transfered to the linear motion, which adjusts it's swing into phase with the mean phase of the other pendulums.

How's that?

B
__________________
'Government is like a baby:
An alimentary canal with a big appetite at one end and
no sense of responsibility at the other'
- Ronald Reagan
Reply With Quote
  #4  
Old 05-04-2008, 11:01 AM
Dubyagee's Avatar
All fields are required
 
Join Date: Jul 2006
Location: SE
Posts: 5,914
According to my book of magic, tiny invisible monkeys line them up.


They use setups like that in skyscrapers in Japan. They mount the water tank hanging from the ceiling of the top floor to counter earthquakes.
Reply With Quote
  #5  
Old 05-04-2008, 01:09 PM
Botnst's Avatar
What knockers!
 
Join Date: Jun 2003
Location: There castle.
Posts: 40,775
Water towers? I didn't know that. Clever and makes a hell of a lot of sense.

Wonder what it does to vertical motion -- is the waterball spring-loaded?
__________________
'Government is like a baby:
An alimentary canal with a big appetite at one end and
no sense of responsibility at the other'
- Ronald Reagan
Reply With Quote
  #6  
Old 05-04-2008, 01:11 PM
Medmech's Avatar
Gone Waterboarding
 
Join Date: Feb 2007
Posts: 117
Quote:
Originally Posted by Botnst View Post
Water towers? I didn't know that. Clever and makes a hell of a lot of sense.

Wonder what it does to vertical motion -- is the waterball spring-loaded?
I'm looking for a source I saw a NOVA about earthquakes and Japanese skyscrapers about it, some even have hydraulic footings.
Reply With Quote
  #7  
Old 05-04-2008, 01:49 PM
Emmerich's Avatar
M-100's in Dallas
 
Join Date: Jul 2003
Location: Dallas
Posts: 678
The water is just convenient. Most of the time a large mass is used to reduce sway in wind conditions, basically a big shock absorber. For earthquakes thev may have some sort of system in the foundation to prevent too much movement/damage. The water is easier because it can be pumped up, the large mass has to be moved up to the top in pieces and assembled, very difficult to do.

Quote:
Originally Posted by Dubyagee View Post
They use setups like that in skyscrapers in Japan. They mount the water tank hanging from the ceiling of the top floor to counter earthquakes.
__________________
MB-less
Reply With Quote
  #8  
Old 05-04-2008, 01:51 PM
Dubyagee's Avatar
All fields are required
 
Join Date: Jul 2006
Location: SE
Posts: 5,914
http://findarticles.com/p/articles/mi_kmtpi/is_200704/ai_n19005736
Reply With Quote
  #9  
Old 05-04-2008, 01:54 PM
Hatterasguy's Avatar
Zero
 
Join Date: Nov 2002
Location: Milford, CT
Posts: 19,306
Its magic!
__________________
2020 GMC Sierra Denali
2007 Tiara 3200
Reply With Quote
  #10  
Old 05-04-2008, 03:48 PM
Geezer
 
Join Date: Aug 2000
Location: Holland, MI
Posts: 1,316
When the metronomes are on the table, any back-and-forth force imbalances are resisted by the force from friction of table acting on the wood strip. Unless the motion/force is great enough, they do not move.

Now, by taking the wood off of the table and placing it on rollers (cans) there is a lot less friction to resist andy back-and-forth motion.

Unless acted on by an external force, the net sum of all of the back-and-forth of the metronomes, must be zero, so the wood strip moves in response to this net sum at every instant.

Since there is a small amount of friction on the rollers, the strip does not move exactly to the sum, and some energy is lost moment to moment. The energy loss causes the metronomes to change beat slightly, and this energy loss continues until they finally synchronize, eliminating any net force and further energy loss.

Without rolling friction of the cans, the wood strip would keep wobbling back and forth in response the instantaneous force differences, and the metronomes would not synchronize.

All in all, a very cool demonstration.

I hope this is right, and that it makes sense...
Reply With Quote
  #11  
Old 05-04-2008, 10:01 PM
MS Fowler's Avatar
Registered User
 
Join Date: Jan 2003
Location: Littlestown PA ( 6 miles south of Gettysburg)
Posts: 2,239
Jim,
I think you and Bot agree.
WOW!
__________________
1982 300SD " Wotan" ..On the road as of Jan 8, 2007 with Historic Tags
Reply With Quote
  #12  
Old 05-05-2008, 08:49 AM
Kuan's Avatar
unband
 
Join Date: Jan 2001
Location: At the Birkebeiner
Posts: 3,811
Hmm I kinda get it. The moving board subtracts the difference between the two peaks? Sorta? Yeah cool.
__________________
You don't need a weatherman to know which way the wind blows - Robert A. Zimmerman
Reply With Quote
  #13  
Old 05-05-2008, 05:53 PM
280SE Guy's Avatar
Registered User
 
Join Date: Jan 2004
Location: Pennsylvania
Posts: 246
Physicists Explain This!

You will be assimilated.


Reply With Quote
Reply

Bookmarks

Thread Tools
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is On
Trackbacks are On
Pingbacks are On
Refbacks are On




All times are GMT -4. The time now is 10:35 AM.


Powered by vBulletin® Version 3.8.7
Copyright ©2000 - 2020, vBulletin Solutions, Inc.
Search Engine Optimization by vBSEO 3.6.0
Copyright 2018 Pelican Parts, LLC - Posts may be archived for display on the Peach Parts or Pelican Parts Website -    DMCA Registered Agent Contact Page