Puzzle Definition and 595 Threads

Reference: http://www.harktheherald.com/modules.php?op=modload&name=News&file=article&sid=47773&mode=thread&order=0&thold=0

This a puzzle for me. x^3 -x -x^3=0 Obviously x=0 but, divide both sides by x x^2 -1 -x^2=0 except for when x=0 'cause undefined but that means -1=0 is this apparent conflict not in fact one because you can't rule out x=0 ?

http://www.etienne.nu/imagepuz/4845.htm How would I go about solving this? I know it involes trigonometry, but I donnot know how to get the proper answer.

Ok, At least six (intelligent, have degree's etc, and are old) adults have tried our 13 years old's homework... Question is: 'A' divided into 'HAPPY' = 'XMAS' or I suppose 'A' * 'XMAS' = 'HAPPY' Each letter stands for a different number. Apparently there may be more than one answer...

http://www.woolythinking.com/html/darkroomIE.html?o=0o Pretty hard flash puzzle. Took me over 2 hours to beat. Not really worth it, but good if you like these sort of things.

It's all still so confusing! Setting up the equation isn't the problem.. plugging in the numbers. I'm missing varibables and I don't know where to go to find themm i. if the spring constant is 2000 N/m how far will the spring have to compress to bring the coaster to a stop? (Asume the weight...

:blushing: I am getting confused. electrons, protons, which finger goes where in the left hand rule... agh! lol, I am muddling myself all up. i understand the rule (well i hope i do by now as that means the rest of my homework is wrong) but the last question of my h/w is almost killing me...

a diophantine puzzle for abstract algebra students A Diophantine Puzzle We give an application of ring theoretic methods to study a classical problem: which primes p in Z are sums of two squares? Trial and error suggests that the answer is p = 2 = 1^2+1^2, and those p which are congruent to...

Hi everyone. I've been stumped trying to figure this one out for the past week, I think some may have seen it before. It looks like this: *EDIT* The picture I attempted to draw didn't post right, I'll have one up soon. *EDIT 2* Here we go...

Everyone will appreciate that a Chess board consists of 64 squares. The board is eight squares by eight squares. A puzzle may be made by cutting the board into pieces , along the boundary of the squares, and then attempting to reassemble the pieces back into the original 8 x 8 square shape...

Authors propose solution to dark matter and alternative to MOND. Higher Order Curvature Theories of Gravity Matched with Observations: a Bridge Between Dark Energy and Dark Matter Problems http://www.arxiv.org/abs/astro-ph/0411114 Higher order curvature gravity has recently received a lot...

Here is a grafical problem. You have to use two straight lines to cut up the pentagram star and you have to get 10 triangles. The triangles must not be counted twice. Or to put it another way, the same area can only be used once...

Hi - Here's the entire problem to avoid confusion >< "A kite is flying at a height of 500 ft and at a horizontal distance of 100 ft from the stringholder on the ground. The kite string weighs 1/16 oz/ft and is hanging in the shape of the parabola y=(x^2)/20 that joins the stringholder at...

Ok, this is probably the simplest problem I was assigned out of an intro physics course and simply cannot figure out how to go about it. Hockey Puck B at rest is struck by puck A, which was traveling at 40.0m/s in the +x direction. After they hit, A is deflected 30 degrees above the x axis...

Hi, I have tried to solve this puzzle: If we had a round meadow and a cow tied with a rope on the edge of that meadow. Hw long should be a rope if we wanted to let the cow eat a half of that meadow? I have tried to solve this puzzle time ago and now it attracted me again. Does anyone know how...

I don't know where I learned this originally, but I have never been able to solve it. (And I don't remeber what its called) http://n0n.madtracker.net/boxthing.GIF All you got to do is draw one continuous line threw all the box lines once, I did an example so that you get what I mean...

This is a chess/math puzzle I invented: Consider a fully set up chess board (in starting position). Invent a condition (new rule) in which black wins without either side making any moves. Note: this problem has a really abstract and *topological* approach. :smile: Please email me...

Hello, I'm starting to study physics, and I have a problem that I have puzzled me for long... here it is. any help appreciated. thanks in advanced. A tennis ball with a speed of 23.6 m/s is thrown perpendicularly at a wall. After strik- ing the wall, the ball rebounds in the opposite...

Dear Everybody, Perhaps you know this puzzle, there are five rooms arranged as below: -------------- lxxxlxxxxxxlxxxl (please ignore the x's, they are 'spacers') -------------- lxxxxxxlxxxxxxxl (with no breaks, the walls are solid) -------------- The aim of the...

I have been working on this problem for a while, and I still don't understand how to set it up for the first part of this problem: At the instant the traffic light turns green, an automobile starts with a constant acceleration a of 2.2 m/s squared. At the same instant a truck, traveling with...

two dimensions Two stones are thrown horizontally with the same velocity from the tops of two different buildings. One stone lands twice as far from the based of the building from which it was thrown as does the other stone. Find the ratiio of the height of the taller building to the height...

Homework puzzle from 15 years ago never solved - Please Help! :confused: I had this puzzle in one of my math classes in Jr. High - for 15 years I have been trying to solve it - no one would ever give me the answer, and I was sick on the day the teacher gave it. He has since retired, and no one...

this just appeared at SPR: John Baez: -----quote----- In a surprise move, Hawking has decided to give a lecture on the black hole information problem in Dublin this July, at a conference called "GR17" where I'll also be speaking. I've heard rumors that he believes he's "solved" this...

Okay, so a hunter gets out of his cabin on morning and gets into his jet powered surface cruiser. He travels 4000 miles south; turns eastward and travels 4000 miles and finally turns north and cruises for 4000 miles, at the end of which he is back outside his cabin. Now he sees a bear standing...

Entropy is increasing. I am accepting this statement as a fact which I don't know how to verify by experiment. Entropy, as I understand, is related to number of arrangement of objects found in a given system. The more objects there are, the higher is the entropy. For a universe of just one...

These we're the problems that I've tried to do. Solutions with steps would greatly be appreciated. 1. Suppose that a, b, c, are distinct non-zero digits. (A) Find a formula, depending on a,b, c, for the sum of all six digit integers whose only digits are a,b,c. (B) What is the sum of all...

This story surprisingly puzzles some people: Eleven friends go into a beer hall. Six of them sit at table A and five of them sit at table B. Each of the eleven orders one round for his own table. Now table A has more payers, but a person at table A ends up paying more than a person at...

I do not know how to do the second part of this question. I never learned this. A laser used to weld detached retinas puts out pulses of 640 nm light, 25 ms long, which average 0.50 W output during a pulse. i) how much energy can be deposited pre pulse? ii) If the energy of a light...

this is my webassign question for this week but I'm a little confused about the first part... for part a) shouldn't the ratio just be 1 to 1, since the piston is exactly in the center?? or did i understand that wrong? I'm not all that great at chem especially when it comes to chem and physics...

Hi, its my first post, so don't be too hard on me. Here's my dilemma: I'm trying to write a computer program, to return a number with it's apropriate suffix. (ie: 1=1st, 2=2nd, 3=3rd, etc.) Forget the programming aspect for a minute, all I'm interested in is the logic. If X=answer, I can...

Can anyone solve this puzzle that a friend sent to me? When Ann is half as old as Mary will be when Mary is three times as old as Mary is now. Mary will be five times as old as Ann is now. Neither Ann nor Mary may vote. How old is Ann?

It's been bugging me http://goth1337.tripod.com/puzzle.tga

How can there be dust on the moon if there is no weathering whatsoever? I'm going insane over it.

Problem: (n!)^3 n = {1-99} How many digit is the resulting (n!)^3 ? Attempted solution: \Sigma^{99}_{n=1} (n!)^3 = (\Sigma^{99}_{n=1} (n!))^3 = 99(\frac{1!^3 - 99!^3}{2}) =~ 470 digits. But they say it's wrong. Please help.

I have a huge jigsaw puzzle to assemble. I start by looking through the pieces and see if there are pairs I can join. Then, I look through the pairs and see what other pieces I can add on. The size of my assembled pieces grows and their number shrinks. I am using the algorithmic paradigm called...

Consider the following: You are in a room containing an 3 empty metal bottles. Each bottle is equipped with a valve which when open connects the interior of the bottle to the room, and when shut seals the bottle. You also have a pump that can generate an air pressure of 10 Pascals. It...

Mad Ade was looking after his two year old Nephew (He charges two Kebabs an hour if you are in need of a babysitter). His Nephew had 4 play blocks each with 6 sides. Each side has a letter from the alphabet. No letters are ever repeated. By arranging the blocks in different ways Mad Ade's...

In Ireland, 16 year olds are expected to answer this question at some point during the leaving cert physics course. I’m finding it difficult to answer. Can anyone help me here? Ah, nothing like sharing wisdom... The rear of a bicycle passes a point P on a road and travels at a steady speed of...

This one I read but is so good I wanted to post it reworded. Two groups of people live on this planet, pure liars and pure truth tellers. I went to a philosophy party(never mind that it's impossible) and met 3 people. The first says something but I don't catch it, the second one replies, "he...

Okay Maths quiz! normal rules apply (first to answer question correctly gets to ask the next question, etc.): 1) &radic;(5 + &radic;(24)) = ? in exact surd form

Noting their locations I place two aces and a jack face down on a table in a row. You do not see which card is placed where. Your problem is to point to one of the cards and ask me a sinlge yes or no question, from the answer to which you can, with certainty, identify one of the three cards as...

hi! I've got a puzzle.can u solve it?here it is: a father has 90 apples.he has 3 children: A,B,and C.one day, the father told his children this: Come here A, sell this 50 apples with the same procedure like your 2 brothers that result the same income Come here B, sell this 30 apples with...

"hardest puzzle ever" today i ran across this puzzle: -------------------- ON a train Smith, Jones, and Robinson are the fireman, brakeman, and engineer, but NOT respectivly. Also aboard are three business men who have the same names: a Mr. Smith, a Mr. Jones, and a Mr. Robinson...

What is the greatest Mathematical puzzle that is unsolved? and why?

one needs to estimate or calculate how many cellular phones can fill the front seat's leg room of a BMW Z4 (Only the leg room of both the front seats and not on the seats)- a range of Samsung handsets are filled up to the seat level only, I believe their is a scientific way of determining...