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Metalworking (rec.crafts.metalworking) Discuss various aspects of working with metal, such as machining, welding, metal joining, screwing, casting, hardening/tempering, blacksmithing/forging, spinning and hammer work, sheet metal work. |
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#1
Posted to rec.crafts.metalworking
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A good Car Talk Puzzler
How many of you are good enough at high powered math to solve this week's puzzzler? It only took me about 10 minutes. G Here 'tis: http://www.cartalk.com/content/puzzl...116/index.html Don't reply with the answer, just tell me how long it took YOU to "get it". Jeff -- Jeffry Wisnia (W1BSV + Brass Rat '57 EE) The speed of light is 1.8*10e12 furlongs per fortnight. |
#2
Posted to rec.crafts.metalworking
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A good Car Talk Puzzler
On Apr 18, 11:48*am, jeff_wisnia
wrote: How many of you are good enough at high powered math to solve this week's puzzzler? It only took me about 10 minutes. G Here 'tis: http://www.cartalk.com/content/puzzl...116/index.html Don't reply with the answer, just tell me how long it took YOU to "get it". Jeff About 10 seconds. jsw |
#3
Posted to rec.crafts.metalworking
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A good Car Talk Puzzler
On Apr 18, 12:09*pm, Jim Wilkins wrote:
On Apr 18, 11:48*am, jeff_wisnia wrote: How many of you are good enough at high powered math to solve this week's puzzzler? It only took me about 10 minutes. G Here 'tis: http://www.cartalk.com/content/puzzl...116/index.html Don't reply with the answer, just tell me how long it took YOU to "get it". Jeff About 10 seconds. jsw , I must be only half as smart as Jeff, 20 seconds. CarlBoyd |
#4
Posted to rec.crafts.metalworking
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A good Car Talk Puzzler
Jim Wilkins wrote:
On Apr 18, 11:48 am, jeff_wisnia wrote: How many of you are good enough at high powered math to solve this week's puzzzler? It only took me about 10 minutes. G Here 'tis: http://www.cartalk.com/content/puzzl...116/index.html Don't reply with the answer, just tell me how long it took YOU to "get it". Jeff About 10 seconds. jsw Jim, I see we have a common middle initial. My middle name is Arnold. I never thought to ask why my folks picked that name but even though it would "fit" I'm just as happy that they didn't choose Edward or Ethan. G Jeff (Happy Passover to those celebrating it.) -- Jeffry Wisnia (W1BSV + Brass Rat '57 EE) The speed of light is 1.8*10e12 furlongs per fortnight. |
#5
Posted to rec.crafts.metalworking
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A good Car Talk Puzzler
jeff_wisnia fired this volley in
: http://www.cartalk.com/content/puzzl...116/index.html In this case, there is no "higher math". The poles must be exactly touching for half of a 150' long rope to reach down 75'. LLoyd |
#6
Posted to rec.crafts.metalworking
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A good Car Talk Puzzler
"Lloyd E. Sponenburgh" lloydspinsidemindspring.com fired this volley in
.70: In this case, there is no "higher math". The poles must be exactly touching for half of a 150' long rope to reach down 75'. oops! I thought it was an old puzzler! (urk!) LLoyd |
#7
Posted to rec.crafts.metalworking
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A good Car Talk Puzzler
On Mon, 18 Apr 2011 09:09:06 -0700 (PDT), Jim Wilkins
wrote: On Apr 18, 11:48Â*am, jeff_wisnia wrote: How many of you are good enough at high powered math to solve this week's puzzzler? It only took me about 10 minutes. G Here 'tis: http://www.cartalk.com/content/puzzl...116/index.html Don't reply with the answer, just tell me how long it took YOU to "get it". About 10 seconds. I don't know the answer. I'm almost certain they misspelled "canary", though. -- If only he'd wash his neck, I'd wring it. -- John Sparrow |
#8
Posted to rec.crafts.metalworking
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A good Car Talk Puzzler
On Apr 18, 12:29*pm, jeff_wisnia
wrote: Jim Wilkins wrote: On Apr 18, 11:48 am, jeff_wisnia wrote: How many of you are good enough at high powered math to solve this week's puzzzler? It only took me about 10 minutes. G Here 'tis: http://www.cartalk.com/content/puzzl...116/index.html Don't reply with the answer, just tell me how long it took YOU to "get it". Jeff About 10 seconds. jsw Jim, I see we have a common middle initial. My middle name is Arnold. I never thought to ask why my folks picked that name but even though it would "fit" I'm just as happy that they didn't choose Edward or Ethan. G Jeff (Happy Passover to those celebrating it.) -- Jeffry Wisnia Mine did pick Edward, though I never suffered for it in school. The S is Edward's last name, so I had a good excuse, my grandfather's name sandwiched into my father's. jesw |
#9
Posted to rec.crafts.metalworking
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A good Car Talk Puzzler
In article , jeff_wisnia wrote:
How many of you are good enough at high powered math to solve this week's puzzzler? It only took me about 10 minutes. G Here 'tis: http://www.cartalk.com/content/puzzl...116/index.html Don't reply with the answer, just tell me how long it took YOU to "get it". Less than five seconds. |
#10
Posted to rec.crafts.metalworking
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A good Car Talk Puzzler
Lloyd E. Sponenburgh wrote:
fired this volley in : http://www.cartalk.com/content/puzzl...116/index.html In this case, there is no "higher math". The poles must be exactly touching for half of a 150' long rope to reach down 75'. Oh hell... I was going to get out an ancient electrical engineering book that was full of wire droop formulas to figure it out... |
#11
Posted to rec.crafts.metalworking
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A good Car Talk Puzzler
Lloyd E. Sponenburgh wrote:
jeff_wisnia fired this volley in : http://www.cartalk.com/content/puzzl...116/index.html In this case, there is no "higher math". The poles must be exactly touching for half of a 150' long rope to reach down 75'. I want my money back. Jon |
#12
Posted to rec.crafts.metalworking
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A good Car Talk Puzzler
jeff_wisnia wrote:
How many of you are good enough at high powered math to solve this week's puzzzler? It only took me about 10 minutes. G Here 'tis: http://www.cartalk.com/content/puzzl...116/index.html Don't reply with the answer, just tell me how long it took YOU to "get it". Jeff About 20 seconds. -- Steve W. |
#13
Posted to rec.crafts.metalworking
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A good Car Talk Puzzler
Jim Stewart wrote:
Lloyd E. Sponenburgh wrote: fired this volley in : http://www.cartalk.com/content/puzzl...116/index.html In this case, there is no "higher math". The poles must be exactly touching for half of a 150' long rope to reach down 75'. Oh hell... I was going to get out an ancient electrical engineering book that was full of wire droop formulas to figure it out... I looked up "cantenary" (note spelling) and Wiki had the formula; I was all set to write a program that would try test values in the formula until I zeroed in on one that gave the answer. I wonder if in this case it would converge? I guess I now have one more useless thing to waste my ample "spare time" on. ;-) Cheers! Rich |
#14
Posted to rec.crafts.metalworking
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A good Car Talk Puzzler
Rich Grise wrote:
Jim Stewart wrote: Lloyd E. Sponenburgh wrote: fired this volley in : http://www.cartalk.com/content/puzzl...116/index.html In this case, there is no "higher math". The poles must be exactly touching for half of a 150' long rope to reach down 75'. Oh hell... I was going to get out an ancient electrical engineering book that was full of wire droop formulas to figure it out... I looked up "cantenary" (note spelling) and Wiki had the formula; ^^^^^^^^^ -- OOOPPPS!!!!!!!!! I was all set to write a program that would try test values in the formula until I zeroed in on one that gave the answer. I wonder if in this case it would converge? I guess I now have one more useless thing to waste my ample "spare time" on. ;-) "Catenary," of course. Cheers! Rich |
#15
Posted to rec.crafts.metalworking
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A good Car Talk Puzzler
Bother. You're smarter than I. I was going to get out a
calculator, and start doing arcs and cosines. -- Christopher A. Young Learn more about Jesus www.lds.org .. "Lloyd E. Sponenburgh" lloydspinsidemindspring.com wrote in message .70... http://www.cartalk.com/content/puzzl...116/index.html In this case, there is no "higher math". The poles must be exactly touching for half of a 150' long rope to reach down 75'. LLoyd |
#16
Posted to rec.crafts.metalworking
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A good Car Talk Puzzler
jeff_wisnia wrote:
http://www.cartalk.com/content/puzzl...116/index.html Don't reply with the answer, just tell me how long it took YOU to "get it". It took me about a minute. I was thinking of looking up how hyperbolic trig functions work and the equations for determining aspects of a catenary then I got it. Wes |
#17
Posted to rec.crafts.metalworking
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A good Car Talk Puzzler
"Lloyd E. Sponenburgh" lloydspinsidemindspring.com wrote:
jeff_wisnia fired this volley in m: http://www.cartalk.com/content/puzzl...116/index.html In this case, there is no "higher math". The poles must be exactly touching for half of a 150' long rope to reach down 75'. LLoyd You were not supposed to tell the answer! Wes |
#18
Posted to rec.crafts.metalworking
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A good Car Talk Puzzler
"Rich Grise" wrote in message ... Rich Grise wrote: Jim Stewart wrote: Lloyd E. Sponenburgh wrote: fired this volley in : http://www.cartalk.com/content/puzzl...116/index.html In this case, there is no "higher math". The poles must be exactly touching for half of a 150' long rope to reach down 75'. Oh hell... I was going to get out an ancient electrical engineering book that was full of wire droop formulas to figure it out... I looked up "cantenary" (note spelling) and Wiki had the formula; ^^^^^^^^^ -- OOOPPPS!!!!!!!!! I was all set to write a program that would try test values in the formula until I zeroed in on one that gave the answer. I wonder if in this case it would converge? I guess I now have one more useless thing to waste my ample "spare time" on. ;-) "Catenary," of course. Cheers! Rich Correction posted, _just_ in the nick of time! heh heh .... ;)} |
#19
Posted to rec.crafts.metalworking
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A good Car Talk Puzzler
In article , Rich Grise wrote:
Jim Stewart wrote: Lloyd E. Sponenburgh wrote: fired this volley in : http://www.cartalk.com/content/puzzl...116/index.html In this case, there is no "higher math". The poles must be exactly touching for half of a 150' long rope to reach down 75'. Oh hell... I was going to get out an ancient electrical engineering book that was full of wire droop formulas to figure it out... I looked up "cantenary" (note spelling) and Wiki had the formula; "Catenary" (note spelling) |
#20
Posted to rec.crafts.metalworking
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A good Car Talk Puzzler
Wes fired this volley in news:Yl3rp.46111
: You were not supposed to tell the answer! I already apologized! I thought it was an old puzzler. I worked this weekend! (sorry) LLoyd |
#21
Posted to rec.crafts.metalworking
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A good Car Talk Puzzler
"Jon Danniken" wrote in message ...
Lloyd E. Sponenburgh wrote: jeff_wisnia fired this volley in : http://www.cartalk.com/content/puzzl...116/index.html In this case, there is no "higher math". The poles must be exactly touching for half of a 150' long rope to reach down 75'. I want my money back. Jon Reply: Actually 2x the thickness of the rope. Touching, the rope could not loop between them. |
#22
Posted to rec.crafts.metalworking
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A good Car Talk Puzzler
"Califbill" fired this volley in
m: Reply: Actually 2x the thickness of the rope. Touching, the rope could not loop between them. Actually touching. Any thickness to the rope would prevent the bottom of the catenary from being 75' down. It has to be a one-dimensional rope - length only, no thickness. LLoyd |
#23
Posted to rec.crafts.metalworking
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A good Car Talk Puzzler
"Lloyd E. Sponenburgh" wrote in message
. 3.70... "Califbill" fired this volley in m: Reply: Actually 2x the thickness of the rope. Touching, the rope could not loop between them. Actually touching. Any thickness to the rope would prevent the bottom of the catenary from being 75' down. It has to be a one-dimensional rope - length only, no thickness. LLoyd Touching, could not have a loop between. |
#24
Posted to rec.crafts.metalworking
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A good Car Talk Puzzler
"Califbill" wrote in message ... "Lloyd E. Sponenburgh" wrote in message . 3.70... "Califbill" fired this volley in m: Reply: Actually 2x the thickness of the rope. Touching, the rope could not loop between them. Actually touching. Any thickness to the rope would prevent the bottom of the catenary from being 75' down. It has to be a one-dimensional rope - length only, no thickness. LLoyd Touching, could not have a loop between. I over-thought this one. Any real rope is going to have a curve at the bottom, where the direction reverses, so it will never be quite 75' down. However, then I realized that if the problem were that tricky, there is no way that any distance between poles would allow the rope to reach a point 75' down. So I gave up. d8-) -- Ed Huntress |
#25
Posted to rec.crafts.metalworking
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A good Car Talk Puzzler
"Lloyd E. Sponenburgh" lloydspinsidemindspring.com wrote:
"Califbill" fired this volley in Reply: Actually 2x the thickness of the rope. Touching, the rope could not loop between them. Actually touching. Any thickness to the rope would prevent the bottom of the catenary from being 75' down. It has to be a one-dimensional rope - length only, no thickness. Those are the ones they use to tie up the spherical cows, right? ;-) Cheers! Rich |
#26
Posted to rec.crafts.metalworking
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A good Car Talk Puzzler
I must be doing things wrong I can do this with one utility pole.
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#27
Posted to rec.crafts.metalworking
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A good Car Talk Puzzler
"Califbill" fired this volley in news:O-
: Touching, could not have a loop between. You don't get it. It's a one-dimensional "rope" It has _zero_ thickness, so it will fit in a space of zero dimension wide. Think two line segments, infinitely close together, and still intersecting at the bottom. Lloyd |
#28
Posted to rec.crafts.metalworking
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A good Car Talk Puzzler
Rich Grise fired this volley in news:iokfs0$n4t
: Those are the ones they use to tie up the spherical cows, right? ;-) Yup, and to wrap inverted torii. LLoyd |
#29
Posted to rec.crafts.metalworking
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A good Car Talk Puzzler
Califbill wrote:
Actually touching. Any thickness to the rope would prevent the bottom of the catenary from being 75' down. It has to be a one-dimensional rope - length only, no thickness. 75 feet implies a level of precision which generously allows for a reasonable thickness of rope - real world, 3D rope - to achieve the specified results. Jon |
#30
Posted to rec.crafts.metalworking
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A good Car Talk Puzzler
"Jon Danniken" fired this volley in
: 75 feet implies a level of precision which generously allows for a reasonable thickness of rope - real world, 3D rope - to achieve the specified results. Where the heck do you figure that? A line segment can be _exactly_ any length you wish it to be, and can be topograpically "folded" to represent two line segments of _exactly_ half the original length... AND the two folded sections can be infinitely close together, and still not violate any geometric rules. LLoyd |
#31
Posted to rec.crafts.metalworking
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A good Car Talk Puzzler
On Mon, 18 Apr 2011 11:48:18 -0400, jeff_wisnia
wrote: How many of you are good enough at high powered math to solve this week's puzzzler? It only took me about 10 minutes. G Here 'tis: http://www.cartalk.com/content/puzzl...116/index.html Don't reply with the answer, just tell me how long it took YOU to "get it". Jeff I figured the parabola equation was needed and couldn't figure on how to plot it in the real world to make trough parabolic mirrors years ago. I assumed the hanging chain was a parabola. Thinking back, I wonder if that was the reason that the mirror was off a bit. I tryed to fix it while testing the curve with a plumb bob and sighting down the string, but started exponentially getting further off so I went back to the original. Things that make ya go hmmm. SW |
#32
Posted to rec.crafts.metalworking
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A good Car Talk Puzzler
"Lloyd E. Sponenburgh" wrote in message
. 3.70... "Califbill" fired this volley in news:O- : Touching, could not have a loop between. You don't get it. It's a one-dimensional "rope" It has _zero_ thickness, so it will fit in a space of zero dimension wide. Think two line segments, infinitely close together, and still intersecting at the bottom. Lloyd Reply: If it is zero dimension between the poles then the stated question is not answered. Said two (2) (pair) poles. |
#33
Posted to rec.crafts.metalworking
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A good Car Talk Puzzler
"Jon Danniken" wrote in message ...
Califbill wrote: Actually touching. Any thickness to the rope would prevent the bottom of the catenary from being 75' down. It has to be a one-dimensional rope - length only, no thickness. 75 feet implies a level of precision which generously allows for a reasonable thickness of rope - real world, 3D rope - to achieve the specified results. Jon Reply: Not me that you quoted. |
#34
Posted to rec.crafts.metalworking
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A good Car Talk Puzzler
"Lloyd E. Sponenburgh" wrote in message
. 3.70... "Jon Danniken" fired this volley in : 75 feet implies a level of precision which generously allows for a reasonable thickness of rope - real world, 3D rope - to achieve the specified results. Where the heck do you figure that? A line segment can be _exactly_ any length you wish it to be, and can be topograpically "folded" to represent two line segments of _exactly_ half the original length... AND the two folded sections can be infinitely close together, and still not violate any geometric rules. LLoyd Reply: 150' of rope is +- 12" 149.5 to 150.4. |
#35
Posted to rec.crafts.metalworking
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A good Car Talk Puzzler
"Califbill" fired this volley in
m: Reply: If it is zero dimension between the poles then the stated question is not answered. Said two (2) (pair) poles. You aren't dealing with the reality that two "perfect" poles of any dimension you wish to name (length, diameter) can be positioned zero distance apart. You wish to name your own rules for geometry. The basic ones apply, nonetheless. LLoyd |
#36
Posted to rec.crafts.metalworking
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A good Car Talk Puzzler
"Califbill" fired this volley in
: Reply: 150' of rope is +- 12" 149.5 to 150.4. So, you're assuming that the author of the puzzle stipulated a "tolerance" Such a tolerance was not called out. In absence of one, 150' means one- hundred-fifty feet -- NOT +- a foot. Tolerances cut both ways. If you name one, you must use sufficient precision to make sure your specs are met. In the absense of one, all measurements are _exact_. LLoyd |
#37
Posted to rec.crafts.metalworking
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A good Car Talk Puzzler
"Califbill" fired this volley in
: Besides, that is a stupidly (yes, stupidly) applied idea, that you can "pervert" the conditions of a mental puzzle, simply because you wish to do so. The conditions named are the conditions you must deal with. If you can't think to that "level of precision", then get out of the way of people who can. Gawd! LLoyd |
#38
Posted to rec.crafts.metalworking
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A good Car Talk Puzzler
Califbill wrote:
"Lloyd E. Sponenburgh" wrote in message . 3.70... "Jon Danniken" fired this volley in : 75 feet implies a level of precision which generously allows for a reasonable thickness of rope - real world, 3D rope - to achieve the specified results. Where the heck do you figure that? A line segment can be _exactly_ any length you wish it to be, and can be topograpically "folded" to represent two line segments of _exactly_ half the original length... AND the two folded sections can be infinitely close together, and still not violate any geometric rules. LLoyd Reply: 150' of rope is +- 12" 149.5 to 150.4. Correct, although in practice a length of rope 150 feet long is usually understood to be a little on the long side. Additionally, given that a length of rope 150 feet long is going to stretch a bit when hanging by its own weight, the poles need not be touching. Jon |
#39
Posted to rec.crafts.metalworking
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A good Car Talk Puzzler
"Lloyd E. Sponenburgh" lloydspinsidemindspring.com wrote:
You were not supposed to tell the answer! I already apologized! I thought it was an old puzzler. I worked this weekend! (sorry) So did I and now they want me to work the Easter holiday and this is our slow time. Wes -- "Additionally as a security officer, I carry a gun to protect government officials but my life isn't worth protecting at home in their eyes." Dick Anthony Heller |
#40
Posted to rec.crafts.metalworking
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A good Car Talk Puzzler
"Lloyd E. Sponenburgh" wrote in message
. 3.70... "Califbill" fired this volley in : Reply: 150' of rope is +- 12" 149.5 to 150.4. So, you're assuming that the author of the puzzle stipulated a "tolerance" Such a tolerance was not called out. In absence of one, 150' means one- hundred-fifty feet -- NOT +- a foot. Tolerances cut both ways. If you name one, you must use sufficient precision to make sure your specs are met. In the absense of one, all measurements are _exact_. LLoyd Reply: Implied by the lack of a decimal point. Go look up 'precision' in math. |
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