Science Forums Biology Forum Molecular Biology Forum Physics Chemistry Forum Here's a simple one that stumps me.

 Physics Forum Physics Forum. Discuss and ask physics questions, kinematics and other physics problems.

# Here's a simple one that stumps me.

## Here's a simple one that stumps me. - Physics Forum

### Here's a simple one that stumps me. - Physics Forum. Discuss and ask physics questions, kinematics and other physics problems.

#1
04-23-2007, 11:58 PM
 Ernie Sty Guest Posts: n/a
Here's a simple one that stumps me.

Let's say I am playing a game of paintball and I shoot at someone's back as
they are running away from me. They are within range and the paintball hits
impossible, because say he's thirty feet away and running away. The
paintball must travel thirty feet to reach him, but during the time it
traveled thirty feet, he has moved farther away. Let's say he's moved two
inches further. So, now the paintball must travel two inches more--but in
that time my victim has moved still further away. Each time the paintball
travels to where my target was, he has moved out of position. This could
supposedly be calculated out to infinity with the paintball never reaching
the target.

But it does. So what's wrong with the scenario? It's probably something
simple but I don't get it.

#2
04-24-2007, 12:27 AM
 N:dlzc D:aol T:com \(dlzc\) Guest Posts: n/a
Here's a simple one that stumps me.

Dear Ernie Sty:

"Ernie Sty" <fake_email@yahoo.com> wrote in message
newsZqdnX2HxsqJ1bDbnZ2dnUVZ_gWdnZ2d@giganews.com ...

That is Zeno's paradox, it dates from before the birth of Christ,
and it was a "prank" on one particular school of philosophical
thought.

Solve for when the person running and the paintball are
coincident. Don't mess around with infinite sums where it is not
needed.

David A. Smith

#3
04-24-2007, 12:27 AM
 N:dlzc D:aol T:com \(dlzc\) Guest Posts: n/a
Here's a simple one that stumps me.

Dear Ernie Sty:

"Ernie Sty" <fake_email@yahoo.com> wrote in message
newsZqdnX2HxsqJ1bDbnZ2dnUVZ_gWdnZ2d@giganews.com ...

That is Zeno's paradox, it dates from before the birth of Christ,
and it was a "prank" on one particular school of philosophical
thought.

Solve for when the person running and the paintball are
coincident. Don't mess around with infinite sums where it is not
needed.

David A. Smith

#4
04-24-2007, 05:23 PM
 PD Guest Posts: n/a
Here's a simple one that stumps me.

On Apr 23, 6:58 pm, "Ernie Sty" <[Only registered users see links. ]> wrote:

Look up the paradoxes of Zeno.
This is effectively the same thing as proving that 1/2+1/4+1/8+....

In short, the answer is the time that it takes for each successive
step is smaller and smaller. And an infinite series of smaller and
smaller time steps does not necessarily add up to an infinite amount
of time. Though the analysis above makes it look like an infinite
series of steps (it is), it is still a finite amount of time.

PD

#5
04-24-2007, 05:23 PM
 PD Guest Posts: n/a
Here's a simple one that stumps me.

On Apr 23, 6:58 pm, "Ernie Sty" <[Only registered users see links. ]> wrote:

Look up the paradoxes of Zeno.
This is effectively the same thing as proving that 1/2+1/4+1/8+....

In short, the answer is the time that it takes for each successive
step is smaller and smaller. And an infinite series of smaller and
smaller time steps does not necessarily add up to an infinite amount
of time. Though the analysis above makes it look like an infinite
series of steps (it is), it is still a finite amount of time.

PD

#6
04-24-2007, 06:44 PM
 Ernie Sty Guest Posts: n/a
Here's a simple one that stumps me.

"N:dlzc D:aol T:com (dlzc)" <[Only registered users see links. ]> wrote in message
news:a9cXh.260806\$[Only registered users see links. ]...

That's a wholly practical answer. :-)

#7
04-24-2007, 06:44 PM
 Ernie Sty Guest Posts: n/a
Here's a simple one that stumps me.

"N:dlzc D:aol T:com (dlzc)" <[Only registered users see links. ]> wrote in message
news:a9cXh.260806\$[Only registered users see links. ]...

That's a wholly practical answer. :-)

#8
04-24-2007, 06:50 PM
 Ernie Sty Guest Posts: n/a
Here's a simple one that stumps me.

"PD" <[Only registered users see links. ]> wrote in message

I don't understand, but you seem to have explained it very simply. I will
think about your explanation for a while and I suspect I'll get it
eventually. Thank you for explaining it.

Mathematically, will the succession of fractions you mentioned ever really
equal 2? Or will it go on infinitely without ever reaching 2?

Also, is it possible that space can't be divided into smaller and smaller
sections infinitely; that at some point there is a "smallest possible unit"
of space?

#9
04-24-2007, 06:50 PM
 Ernie Sty Guest Posts: n/a
Here's a simple one that stumps me.

"PD" <[Only registered users see links. ]> wrote in message

I don't understand, but you seem to have explained it very simply. I will
think about your explanation for a while and I suspect I'll get it
eventually. Thank you for explaining it.

Mathematically, will the succession of fractions you mentioned ever really
equal 2? Or will it go on infinitely without ever reaching 2?

Also, is it possible that space can't be divided into smaller and smaller
sections infinitely; that at some point there is a "smallest possible unit"
of space?

#10
04-25-2007, 01:44 AM
 N:dlzc D:aol T:com \(dlzc\) Guest Posts: n/a
Here's a simple one that stumps me.

Dear Ernie Sty:

"Ernie Sty" <[Only registered users see links. ]> wrote in message
news:[Only registered users see links. ]...
....

When you get to the molecular level, "space" is a really poor
concept. It makes sense to talk about "average bond lengths",
but you don't actually find that exact bond length.

Space and time are like "population mean". Makes good sense when
you have a large statistical population, but means nothing for a
population of "a few".

David A. Smith

 Tags simple , stumps

 Thread Tools Display Modes Linear Mode

 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 OffTrackbacks are On Pingbacks are On Refbacks are On Forum Rules
 Forum Jump User Control Panel Private Messages Subscriptions Who's Online Search Forums Forums Home General Science Forums     Biology Forum     New Member Introductions Forum     Chemistry Forum         Organic Chemistry Forum     Physics Forum     General Science Questions and Layperson Board         Science and Religion Forum         Zoology Forum     Environmental Sciences and Issues General Forum     Chit Chat         Science and Lab Jokes     Article Discussion     Molecular Biology News and Announcements         Conferences , Symposiums and Meetings         Molecular Station Suggestion Forum         Instructions for Posting, Help, and Frequently Asked Questions     Science News and Views         Molecular Biology Lectures and Videos     Science Careers         Post-doctoral         Medical School         Ph.D Doctor of Philosophy         Science Jobs Forum Molecular Research Topics Forum     PCR - Polymerase Chain Reaction Forum         Real-Time PCR and Quantitative PCR Forum     Bioinformatics         BioStatistics Forum     Molecular Biology Techniques         Molecular Cloning Forum         Electrophoretic Mobility Shift Assay Forum         Agarose Gel Electrophoresis Forum         BioPhysics Forum         Gene Therapy     Cell Biology and Cell Culture         Apoptosis, Autophagy, and Necrosis Forum         Flow Cytometry Forum         Transfection Forum         Confocal - Microscopy Imaging Techniques         Immunology and Host-Pathogen Interactions         Signalling Biology         Stem Cell Forum     Basic Lab Protocols and Techniques         SDS-PAGE Gel Electrophoresis Forum     DNA Techniques         DNA Extraction Forum         cDNA Forum     Epigenetics Forum: DNA Methylation, Histone and Chromatin Study         ChIP Chromatin Immunoprecipitation Forum     Protein Science         Antibody Forum             Immunoprecipitation Forum         Western Blot Forum         Protein Crystallography Forum         Recombinant Protein Forum         ELISA Assay Forum         Protein Forum     Proteomics Forum         Peptide Forum         Mass Spectrometry Forum         2-D Gel Electrophoresis Forum     Omics and Genomics Forum         Microarrays Forum         Genomics Forum     RNA Techniques Forum         RNAi and SiRNA Forum     Histology Forum         Immunohistochemistry Forum         Immunocytochemistry Forum         Electron Microscopy Forum         Immunofluorescence Forum     Protocols and Methods Forum     Molecular Biology Articles and Protocols     Animal and Molecular Model Systems         Drosophila Forum         Yeast Forum         Zebrafish Forum         Botany Forum         C Elegans Forum         Arabidopsis and Plant Biology         Microbiology Forum         Knockout Mouse Forum     Chromatography Forum Products and Vendor Discussion     Molecular Biology Products and Vendors         Bad Product/Service? Post Here         Lab Equipment Discussion and Reviews Regional Molecular Biology Discussion     Forum Chemie     Forum Biologie     Forum Biologia     Forum Chimica     Forum Physik     Forum De Chimie     Forum De Physique     Forum Chemia     中国人分子的生物学论坛 Chinese     Greek Molecular Biology Forums     分子生物学のフォーラム Japanese     ميدان فارسى. Persian Molecular Biology     [أربيك] علم ساحة- Arabic     Forum de Biologie Moleculaire     Forum Biologia Molecolare     Forum die Molekularbiologie     Foro Biologia Molecular

 Similar Threads Thread Thread Starter Forum Replies Last Post jollyrogership@yahoo.com Physics Forum 64 03-31-2012 10:24 AM Ernie Sty Physics Forum 0 04-23-2007 11:58 PM drelliot@gmail.com Physics Forum 0 08-29-2006 06:32 AM drelliot@gmail.com Physics Forum 1 07-06-2006 05:19 PM

All times are GMT. The time now is 08:39 AM.

 Contact Us - Molecular Biology - Archive - Privacy Statement - Top