Puzzle Definition and 595 Threads

Dear all I am in the process of solving a logic puzzle. This is the extended and much much more challenging version of the popular Einstein's puzzle. From the source, it is said that the person who can solve this puzzle must be brilliant. Here is the puzzle: On the Miss World night...

Stupid Charges! Two identical conducting spheres, fixed in place, attract each other with an electrostatic force of .108 N when their center-to-center separation is 50 cm. The spheres are then connected by a thin conducting wire. When the wire is disconnected, the spheres repel each other with...

Homework Statement A dedicated sports car enthusiast polishes the inside and outside surfaces of a hubcap that is a section of a sphere. When he looks into one side of the hubcap, he sees an image of his face 34.0 cm in back of the hubcap. He then turns the hubcap over, keeping it the same...

http://hathcoat.org/p/cards/dogsmead.htm This is a good puzzle, i solved it in feb 2005

Help me solve this! Hi, Firstly, merry Christmas! Secondly, this has been bugging me for a few days now, wondering if any of you can help? Or if a similar teaser exists? Right, There's a bedroom measuring 12m x 9m (108 m2) Two pieces of carpet: 1st one 10m x 10m (100 m2) 2nd...

THE QUESTION IS POSTED ON THE ATTACHMENT FILE BELOWHomework Statement density of the gates is 4000 kg/m^3 width of the gate is 6mHomework Equations Static Equilibrium : every equation that sums up forces or moments equals zero You also must find the force of the weight going down F=mg but...

[SOLVED] hydrogen atom Homework Statement My book says that R_{1,0}(r) = 2(1/a_0)^{3/2} e^{-r/a_0} is a normalized wavefunction. But if you integrate R_{1,0}(r)^2 over r from 0 to infinity, you do not get 1. What's wrong here?Homework Equations The Attempt at a Solution

Puzzle - can a six 3's can make 31?? This ques was asked to me in cts interview can a six 3's can make 31?? u can use +,-,*,/... wanna answer reply me

There is a woman who is 1,75m tall standing in front of a mirror. Her eyes are to be 10cm below the top of her head. I have to find out how small the mirror can be so that she can still see her entire body in it and how high it has to be hanging on top of the floor. Now I think I can solve it...

Homework Statement http://img98.imageshack.us/img98/7256/circularhn0.png [/URL] Homework Equations None. The Attempt at a Solution The answer key says that the answer is the bus coming to a stop. I think this is the answer because the wheels of the bus are slowing down. Is this the...

I want to know if in rapid adiabatic compression of a gas, is work done by gas on surrounding (atmosphere) numerically same as work done by surrounding on the gas. Please tell if there exists some solid proof of the answers you guys are giving.

You have got two ropes. Every rope is burning in a space of one hour. Burning speed of these ropes is not proportional. I mean, half rope not necessarily will burn in a space of half hour. How can you measure out 50 minutes, using these ropes and fire only?

This is a general question. I was given a problem where you need to find arctan(1/sqrt3). Referring to a pie chart, I see that if you compute y/x, you can see that the coordinates of 7pi/6 equal 1/sqrt3. However, I found the answer is pi/6 and I know the proof is in drawing a right...

Homework Statement A lunch tray is being held in one hand, as the Drawing illustrates. The mass of the tray is .2 kg and its center of gravity is located at its geometric center (the tray is .4m long). On the tray is a 1 kg plate of food and a .25 kg cup of coffee. Obtain the force T exerted...

http://img9.imagepile.net/img9/30498problem.gif After hours of thinking I can't solve this problem: The system of the figure is motionless.Then body 2 is released, arriving to the ground in 2 seconds. The pulley and the rope have no weight, and there is no friction. Find the maximum height...

Hi I am taking senior maths challenge this year and was looking over some of the past paper questions. I did the first 10 questions and they seemed okay (although i took a bit of time on the year question which turned out to be monday) and looked at q10. http://www.wpr3.co.uk/UKMT/smc.html...

Homework Statement Here is the exact wording of my sons problem When a certain land owner died this l shaped plot of land was left to be shared among four children the only stipulation of the will was that the land must be divided into four congruent plots. show how this can be done. The...

Homework Statement We have a filtered amplifier (diagram is attached). We do not know Cf or Rf. We know that: 1 volt input at 5 Hz = 9.25 volt output 1 volt input at 200 Hz = 6.77 volt output 1 volt input at 500 Hz = 3.66 volt output Homework Equations The transfer function for...

Solve this 1 1 1 2 1 1 2 1 1 1 1 1 2 2 1 3 1 2 2 1 1 ? ? ? ? ? ? ? ?

Here is a puzzle that a camp counselor asked me. But unfortunately he forgot to tell me the answer as he said he would at the end of the camp. I checked online at lots of sites but none had this brain teaser. So i hope one of you guys can pm me the answer. Here is the brain teaser. There is a...

Homework Statement Two snowcats tow and emergency shelter to a new location near McMurdo Station, Antartica. (the top view is shown. the cables are horizontal.) The total force F'a +F'b exerted on the shelter is in the direction parallel to the line L and its magnitude is 400lbs. Graphically...

Homework Statement A ramp is made by laying one end of a board on the level floor and the other end on top of a 4.0-foot-high wall, which is 8.0 horizontal feet away. A 3.0 foot-in-diameter ball is rolled under the ramp until it is wedged between the underside of the ramp and the floor. How...

Analytically determine if it is possible to arrange the numbers 0,1,2,3,4,5,6,7,8,9 (not necessarily in this order) in a circle such that the difference between any two adjacent numbers is 3, 4 or 5. Note: Each of the ten numbers must occur exactly once.

ok this is in an example in a first-year physics textbook, yet some how i spent an hour trying to solve it (identities, tricks, etc) and could not find a solution. here is what the textbook states: (1) v2f*cos\phi = 3.5*10^5 - v1f*cos(37) (2) v2f*cos\phi = v1f*sin(37) "now we sqaure these two...

This is reminiscent of similar dice riddles, but the answer to this one appears to defy logic. Unless I'm mistaken, this is not as obvious as it looks. There are six unloaded die. Each has been rolled out of your sight and hidden behind a cup. You are informed that no more than one of them...

Okay, here's my favorite brain teaser. Sorry if an equivalent version has appeared here before. On a remote island somewhere there was an ancient country whose population consisted of 200 people with green eyes and 800 people with blue eyes. The citizens of this country were all happy and...

This is not a puzzle question exactly. It's a question about logic that the puzzle illustrates. There are four dragons. It is known that dragons can have brown eyes but our four all have green eyes. They can see each others eyes, but don't know their own eye colour. They will turn into...

Hi all. Please kindly read the figure below and see if you can help me. Thanks.

Homework Statement Chapter name: Solid state Topic: close packed structures in crystalline solids Sub-topic: close packing in 3D In my Chemistry book I read: Now let us suppose there is 1 sphere only. Can anybody explain to me where the one octahedral void and two tetrahedral voids...

Here's a little special relativity puzzle that I found interesting. Say we have two particles initially at rest in a frame O and separated by a distance L. They begin to uniformly accelerate at t=0 in a direction along the line separating them, until they reach a velocity v at some time t...

I was just swimming with a floating board for the pool, and came up with a thought. What would happen if you had two tubes one filled with air, and the other one filled with water. If you could somehow get an object less than half the density of water to fall down the tube with the air and go...

Good mornign folks. I have sought out this forum in hopes to end a continued argument here in teh office. Below I will describe the situation. If you have time or interest in providing some directionit would be greatly appreciated. 25 card deck. 25 different cards. Shuffle then cut then show...

"Yes, when I take my dog for a walk," said a mathematical friend, "he frequently supplies me with some interesting puzzle to solve. One day, for example, he waited, as I left the door, to see which way I should go, and when I started he raced along to the end of the road, immediately returning...

An extremely simple and old (1960's) programming language based on an imaginary machine. The machine has two peripherals, at paper tape reader, and a paper tape punch. The character set only includes two characters, Asterisk and Hypen. The CPU has 20 memory locations, which hold instructions...

Homework Statement Two markers M1 & M2're set up a vertical distance h apart. When a steel ball is released from rest from a pt a distance x above M1,it's found that the ball takes time t1 to reach M1 and time t2 to reach M2. Which expression gives the acceleration of the ball...

The other day, Mack was preparing a table consisting of integer Fahrenheit temperatures (F) which yields integer Celsius (C) equivalent upon conversion. He noted that F= 527 gave the corresponding C value as 275 and realized that, he could have simply moved the first digit in F to the end to...

Warning: I do not know the answer to this one. If this will keep you up at night, do not read on. I was asked this in a job interview a long time ago. They did like my answers, even though they were "wrong". Still here? OK. You are presented with a rectangular cake. Somewhere at an...

A friend of mine wrote a paper on entanglement, measurement, and simultaneity. the professor provided an interesting question, which he felt demonstrated a violation of special relativity. Of course, this is most likely due to a lack of understanding on the professor's part, but neither I nor...

Trigonometry "puzzle" If we know the perimeter P of a triangle, a side S of it, and the height H down on the line going through S, then we have uniquely determined the triangle. It is not wholly trivial to derive the expressions for the other two sides in terms of P,S and H.

not going to lie... this thing got me pretty frustrated. :bugeye: : you're going to need the picture in the link (print it or copy it on a piece of paper, it's pretty easy to draw. http://aycu37.webshots.com/image/10476/2004406912463755374_rs.jpg[FONT="Times New Roman"][SIZE="4"] - The letters...

Consider a conventional 8×8 chessboard. Arrange one King, five Knights and two Queens on it in such a manner that every vacant square is under attack.

Hi, I recall a thingy when you have somthing like x = 0.91919191 then you go 100x = 91.919191 100x - x = 91 When do you use this? It's in conjuction with somthing else... looked in my textbook can't find it. Thanks

Hi! Following Landau&Lifschitz (L&L) (I´m not a researcher in GTR) it is possible to arrive to a 3D version of Maxwell equations in a GTR-correct form. These equations resembling the ones in a dispersive electric and magnetic material, suggest, at first glance, that there should be a dispersion...

I'm going through my end of the year exam papers, since I figured I should actually make an effort at school this year, well anyway I'm terrible at physics and this question stumped me. Heres a diagram ( I drew it in MS paint ha, I even included a helmet cause riding bikes without one ain't...

I begin eternity, And end space, At the end of time, And in every place, Last in life, Second to death, Never alone, Found in your breath, Contained by earth, Water or flame, My grandeur so awesome, Wind dare not tame, Not in your mind, Am in your dreams...

Determine all possible pairs of positive integers (m, n) for which (n^3 + 27)/(mn - 9) is an integer.

Algebra 1 Help! This is really easy but I just can't seem to get it. Two men were talking about their ages. One said he was 94 years old. "Then," said the younger, "the sum of your age and mine multiplied by the difference will be 8512." How old was the young man. I thought all i...

http://www.digicc.com/fido/ Someone please explain to me how it works.

I am looking for a way to kill some time lately. I enjoy PC games with fairly difficult puzzles. I recently enjoyed "The secrets of Atlantis"... Fairly basic game but a lot of puzzles and quite fun. Does anyone know of any good puzzle type games? I even enjoy games such as Sudoku, so feel free...

http://home.wanadoo.nl/bijkerk/soduky12.GIF This looks a lot like a very popular pastime puzzle with millions of addicts but it is not, it's a superdokey with one more rule. For the lay persons, the rules of the original game are: http://home.wanadoo.nl/bijkerk/soduky6.GIF 1: In each...