science of coin through rubber sheet
science of coin through rubber sheet
searching for something completely unrelated I came across this article on the math and physics of the coin thru dental dam. I don't understand the science behind it but found it an interesting curiosity.
https://arxiv.org/pdf/1509.06232.pdf
daniel zuckerbrot
https://arxiv.org/pdf/1509.06232.pdf
daniel zuckerbrot
-
- Posts: 1369
- Joined: February 7th, 2008, 12:00 pm
- Location: Brooklyn NY
Re: science of coin through rubber sheet
I find Martin Gardner's explanation ( see the end of the paper) more plausible--or at least more understandable.
Click here to get Gerald Deutsch's Perverse Magic: The First Sixteen Years
All proceeds to Open Heart Magic charity.
All proceeds to Open Heart Magic charity.
- Richard Kaufman
- Posts: 27058
- Joined: July 18th, 2001, 12:00 pm
- Favorite Magician: Theodore DeLand
- Location: Washington DC
- Contact:
Re: science of coin through rubber sheet
Isn't "The rubber stretches" sufficient?
Subscribe today to Genii Magazine
-
- Posts: 5915
- Joined: January 17th, 2008, 12:00 pm
- Location: Huntsville, AL
- Contact:
Re: science of coin through rubber sheet
I learned a new word: "invagination". I haven't figured out where to use it yet, though.
Re: science of coin through rubber sheet
Bill Mullins wrote:I learned a new word: "invagination". I haven't figured out where to use it yet, though.
I invaginated my egg bag to show it empty.
- John M. Dale
- Posts: 301
- Joined: January 18th, 2008, 12:00 pm
- Location: Vancouver, WA
Re: science of coin through rubber sheet
I’d never read Martin Gardener’s presentation before and was surprised that he covered the dime with a quarter to hide the actual “penetration”. I’ve never seen it performed that way. Was he perhaps trying to avoid a “too perfect” situation that points to the explanation?
The other thing that caught my eye was that a spherical object could be used instead of a coin. Has anyone out there tried this? If so, please share any observations (reactions, problems, etc.)
JMD
The other thing that caught my eye was that a spherical object could be used instead of a coin. Has anyone out there tried this? If so, please share any observations (reactions, problems, etc.)
JMD
- Richard Kaufman
- Posts: 27058
- Joined: July 18th, 2001, 12:00 pm
- Favorite Magician: Theodore DeLand
- Location: Washington DC
- Contact:
Re: science of coin through rubber sheet
The trick when done as it was created by Lubor Fiedler is perfection. It is indeed too perfect, but it can withstand that test because the only answer it leads to is unimaginable.
Subscribe today to Genii Magazine
-
- Posts: 3307
- Joined: January 17th, 2008, 12:00 pm
- Location: Short card above selection.
Re: science of coin through rubber sheet
How do we know whether or not this is a hoax? I guess we need a bona fide physicist or mathematician to review this and tell us it's real. I have a little math and I discovered that the coefficient of friction for a hot double lift can be determined by the formula:
Fsmax = μs η
Fsmax = μs mg
Fsmax = (0.75)(700 kg)(9.8 m/(s2))
Fsmax = 5145 kg∙m/s2
Fsmax = 5145 N
Fsmax = μs η
Fsmax = μs mg
Fsmax = (0.75)(700 kg)(9.8 m/(s2))
Fsmax = 5145 kg∙m/s2
Fsmax = 5145 N
- Richard Kaufman
- Posts: 27058
- Joined: July 18th, 2001, 12:00 pm
- Favorite Magician: Theodore DeLand
- Location: Washington DC
- Contact:
Re: science of coin through rubber sheet
Uh ... okay. Are you feeling all right, Bob?
Subscribe today to Genii Magazine
-
- Posts: 3307
- Joined: January 17th, 2008, 12:00 pm
- Location: Short card above selection.
Re: science of coin through rubber sheet
Right now, Jim Morrison's head is hovering just over my monitor, but just his head, and he seems to be telling me something about my dog's vocabulary. Other than that, everything's fine.
- erdnasephile
- Posts: 4766
- Joined: January 17th, 2008, 12:00 pm
Re: science of coin through rubber sheet
What a fun paper! (I wish the manuscripts I have to review were half as entertaining).
One observation (which will make the most sense to those medical) is the inclusion of the name, "Sir Roger Penrose" as being in the informational lineage of one of the authors (cited at the end of the paper).
I also thought it was cool that the dental dam itself was invented during Civil War times and was given "as a free gift to the dental profession" by the inventor, Dr. Stanford C Barnum.
One observation (which will make the most sense to those medical) is the inclusion of the name, "Sir Roger Penrose" as being in the informational lineage of one of the authors (cited at the end of the paper).
I also thought it was cool that the dental dam itself was invented during Civil War times and was given "as a free gift to the dental profession" by the inventor, Dr. Stanford C Barnum.
-
- Posts: 2631
- Joined: January 17th, 2008, 12:00 pm
- Location: Edinburgh
- Contact:
Re: science of coin through rubber sheet
I'm curious where Bob got those 700 kilos...
Ian Kendall Close up magician in Edinburgh and Scotland
-
- Posts: 3307
- Joined: January 17th, 2008, 12:00 pm
- Location: Short card above selection.
Re: science of coin through rubber sheet
"Dr. Stanford C Barnum."
Really--"Barnum!"
This has got to be a hoax.
"There's a sucker born every minute." P.T. Barnum
"In the latter part of the 20th century, two were born every minute."-P.J. O'Rourke
Really--"Barnum!"
This has got to be a hoax.
"There's a sucker born every minute." P.T. Barnum
"In the latter part of the 20th century, two were born every minute."-P.J. O'Rourke
- Richard Kaufman
- Posts: 27058
- Joined: July 18th, 2001, 12:00 pm
- Favorite Magician: Theodore DeLand
- Location: Washington DC
- Contact:
Re: science of coin through rubber sheet
Lubor was a scientist: he would have loved all of this.
Subscribe today to Genii Magazine
-
- Posts: 1369
- Joined: February 7th, 2008, 12:00 pm
- Location: Brooklyn NY
Re: science of coin through rubber sheet
I hesitate to ask this--but if the rubber breaks during the invagination, are sponge bunnies the result?
Click here to get Gerald Deutsch's Perverse Magic: The First Sixteen Years
All proceeds to Open Heart Magic charity.
All proceeds to Open Heart Magic charity.
Re: science of coin through rubber sheet
Jack Shalom wrote:I hesitate to ask this--but if the rubber breaks during the invagination, are sponge bunnies the result?
Not with a dental dam....