Fun Definition and 407 Threads

If you're not familiar with Bell's inequality, and the subsequent experiment, I suggest perusing over http://www.upscale.utoronto.ca/GeneralInterest/Harrison/BellsTheorem/BellsTheorem.html" But essentially, an experiment is done with counting the number of electrons with certain spins, and...

Is there anything significant about phi, other than 1 + phi = phi^2 ? Is this just fun number trivia, or is phi actually useful to science, etc...?

This looks like fun. http://www.airkix.com/ For a long time I thought that I wanted to skydive, but I have met two people who had bad experiences and this killed the desire a bit. I also knew a guy who was a diving instructor who always argued how safe it was as a sport. He quit diving after...

Since senior year of HS is wrapping up, my AP physics class is having a party tomorrow and I don't know what to bring. I could bring cookies, but that seems a little plain. Does anyone have any ideas?

Hello, I have some questions dealing with an interactive diagram. to access the diagram go here: http://www.colorado.edu/physics/phet/simulations/lens/lens.swf when you go there set the radius of curvature to 1.0 m, the refractive index to 1.6, and the diameter to 1.2 m Ok first question:1...

Looking for guidance on the following: The text outlines a company's problem, and ways to solve it. Results are hypothetically to be presented to the 'Board of Directors' ina week's time. Help please! Cow Industrials Ltd is a medium sized Engineering Company. A number of their regular customers...

Looking for guidance on the following: The text outlines a company's problem, and ways to solve it. Results are hypothetically to be presented to the 'Board of Directors' ina week's time. Help please! Hope you can help meee :)

in matrix analysis, its easy to you can check if a matrix's diagonal is all 1s because u can only lo.ok at ex, 5x5 mattrix (1,1)(2,2)(3,3)(4,4)(5,5) But what if u want to know about (1,2)(2,3)(3,4)(4,5) without checking as what i list ?

I am Wes, and I have a Physics exam this morning at Laurentian University. I am actually a Biology/Education major and will likely take a Physics minor. This exam is on basic physics and some more advanced calculations. For this exam, we are allowed to use all course notes and laptops for...

Hey, here's a funny thing to try with Google. Do a search for the word "failure", and then click "I'm Feeling Lucky". See what happens.

Determine the energy of an electron in the given level of each of the following ions. Use 'e' notation with two decimal places. For example, -2.34e-22. Hint: Each of the ions has a different number of protons, but each has one electron, so the Bohr model applies to each. Ions: Li2+...

Me and 5 of my friends are on vacation now. I wanted to orginize something that we could do together. I personally would enjoy solving riddles and stuff but not all (4) of my friends are that nerdy. On the other hand, going to the beach or on a hike and stuff are out of the question as are...

Hello everyone, I'm studying for my exam. He gave us anice little pratice exam. Am i thinking too much about this one? Part (a) seems to easy. http://img235.imageshack.us/img235/1554/lastscan9dx.jpg I think I'm trying to make x^(n-c) be x^(n) well to do this, i would add c to (n-c), but if u...

[SIZE="3"]Counting Game This forum word game is simple. You start of with "1" and the next person posts the number following it (2), the next posts the number following it (3) and so on. No double posting If an incorrect number is posted, then carry on with the correct number. I'll...

http://ebaumsworld.com/games/orboxb.html This game is pretty interesting and really makes you think in the later levels. I'm absolutely stuck on level 19. If anyone wants to directly go to level 19 and see what I'm doing, the password is "tgb517". It's really hard because you have to imagine...

Hi, I have an assignment from my Chemistry class which is supposed to be done during my Spring break. The question is to CALCULATE the annual production of CO2(carbon dioxide) in metric tons by all humans in the world from breathing. The assumptions are: 1. The composition of exhaled breath...

In each case find a rotation or reflection which equals the given transformation Rotation through pi followed by reflection in the X axis Now is there a way to actually work this out? The text says the answer is simply reflection on the Y axis. I tried to visualize by drawing a vector...

Hello eveeryone! exam time monday! Just doing some last checks to make sure I'm understanding this correctly. Here is the directions and circuit: THe circuit shown below has beeen in the form shown for a very long time. THe switchopens at t =0. FInd iR at t equal to (a)0-, (b) 0+, (c)...

I'm playing matchmaker again. A guy on another board (ADP) is doing research for a story about a near-miss asteroid and he wants to get his physics right. I am strongly suggesting he do a proper simulation so he's got his numbers straight. Would anyone with the right software be willing to...

Hello, I have a homework problem. I was wondering if you all get/got the same answer that I have: 1.9m. My friend got .6m and I don't know how. I tried working it out twice and still do not come up with .6m. Here it goes: 2 people are carrying a uniform wooden board that is 3.00 m long...

Hello everyone, my professor posted some powerpoint presentations and this seems to be the only equation that seems relatively close to figure out the answer. But I'm confused on the information given and not given. Here is the problem: A string along which waves can travel is 3.60 m long...

For the following open sets a) |Arg z| <pi/4 b) -1 < I am z <= 1 c) (Re z)^2 > 1 Sketch the sets Which are domains Describe the boundary a) |Arg z |< pi/4 well ok that means |\theta_{0} + 2 \pi k| < \pi/4 so the theta must alwasy be less than pi/4 im not sure how to sketch...

Show that the stereographic projections of the points z and 1/\overline{z} are reflections of each other in teh equatorial plane of the Reimann sphere ok so let z = x + iy then \frac{1}{\overline{z}} = \frac{x - iy}{x^2 + y^2} so the magnitude of \frac{1}{\overline{z}} is...

I was just thinking about how to describe two relations in syntactic trees similar to this one: http://xs70.xs.to/pics/06090/tree1.gif And I noticed something funny: You have two dimensions and their corresponding pairs of directions, left/right and up/down, and you can use these to describe...

This needs to be done with Coulomb's Law: A ring of radius R has a charge distribution on it that goes as \lambda (\theta)= \lambda_0 sin \theta as shown in the figure below: http://img506.imageshack.us/img506/8898/naamloos2iz.th.gif In what direction does the field at the center of...

ok, we got a couple of (girl) friends coming down to visit from school for a couple days. We need to show them a good time, but there's not much to do around here. any ideas ? they're coming thursday early afternoon until friday late afternoon. I was already thinking going out to dinner on the...

Varation of Parameters fun! diff EQ question, where do i go next? This is my first attempt at doing Variation of parameters, didn't go to bad, things cancled out pretty well but now I'm almost done but I'm stuck! The problem says: Find the solution of y''+15y'+56y = 54*e^(-5t), with y(0) = 8...

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ideal gases. what fun. please help! i'm having problems getting sensible answers... 1. a cylinder contains 4.62g of hydrogen at 17C and 2.32 x10^6 Pa calculate number of moles. actual mass/molecular mass= 4.62/2= 2.31 (relative molecular mass given as 2 in the question...is this...

So I'm building a CO2 laser for fun, basically. I have a tube that requires 11-18KV DC to fire. Right now I have a 20A variac, a 15KV transformer (30ma out) and then I need to build a rectifier. I have a bag of "1A, 1000V" diodes. So far, I built a full-wave bridge rectifier out of them. I...

more Diff EQ fun! http://cwcsrv11.cwc.psu.edu/webwork2_files/tmp/equations/58/6217226076d5fd259f53ad1e3ed4071.png Find such a solution and then give the related functions requested. http://cwcsrv11.cwc.psu.edu/webwork2_files/tmp/equations/57/f15a6cea760ce4906a6ec16f9d29451.png I submitted...

Happy new year for you all, This is very nice place, So girls and boys, let me give you something to play with: Integrate (r^.a)(r^.b)(r^.c)(r^.d) d(cos8) from cos8=1 to cos8=-1. a,b,c and d are constant vectors, r^ is the unit vector (iX+jY+kZ)/|r|, 8 is the spherical angle between r^...

Hello everyone, we found 3 igan values: 1, 2, 3 for the last case: 3 we came out with 0 -1 0 0 -1 0 2 -2 -2 he wrote b = 0, a = c; then said igan vecotr is: 0 1 1 but clearly shoouldn't it be: 1 0 1 ?

Hello everyone I'm stuck on this problem, how its wrong, i got parts a and c, but b i can't get. Hre is what it says: Consider the following general matrix equation: [a1 a2] = |m11 m12| * [x1 x2] |m21 m22| which can also be written as A = MX Determinant of M = m11m22 - m12m21 A...

I'm studying for my exam on monday and i saw ap roblme that says: Determine if the following is a subspace of R^3. For it to be a subspace it has to pass 1) must have the zero vector 2) closure under addition 3) closure under multiplaication here is my work...

Okay, here's the deal. We all know the law of independent probability after a broken sequence. For example, if you were to flip a coin 100 times, the first 90 times coming up heads and the last one tails. We all know that each flip is 'independent' of the last flip so long as they are taken...

Play it here: http://www.thegn.com/Playgame/Flash_Arcade/Puzzle_Games/N_Game.html Or download it here: http://www.thegamenetwork.com/stickpagehosting/ngame/n_v1pc.zip (Finding threads with links to website games here...:rolleyes: told me post this link in General Discussion)

My grade 12 math teacher gave us a question that I found to be very interesting. You have 12 identical keys. 11 of the 12 keys have the same mass. Only one of them has a different mass. You have a scale, but it is not digital and it does not tell you the actual weight. It only shows you which...

Hello everyone I'm confused on finding the null space on this problem: the matrix is: 0 2 0 -5 0 1 4 0 0 0 1 0 0 0 0 1 null(A) = 2b - 5d = 0 b + 4c = 0; c = 0 d = 0; b = 0; a = ? You don't know what a is, so I'm quite confused. Any help?

How much, often and how do you like to poke fun at your friends, neighbors, relatives, pets, strangers, local politicians and laywers? I think I end up saying a lot of things that piss them off. One time I compressed an ice cube onto my dog's balls while he was sleeping. *tee hee!* :approve: I...

Riding a Loop-the-loop. A car in an amusement park ride rolls without friction around the track shown in the figure. It starts from rest at point A at a height h above the bottom of the loop. Treat the car as a particle. http://community.webshots.com/user/mmaddoxwku" What is the minimum...

Heya, The seniour mathematics teacher at my school has given me (and a few others) the task of designing a 'Math Fun Day'; an event in which about 200 crazy 12-13 year olds visit our science and mathematics school to participate in mathematical activities/games. We're running short on...

Hello all, I have been involved in a discussion on another forum about the TV show Lost. For those who haven't seen it a character (Hurley) wins the lottery with numbers that are supposedly 'cursed' and ends up stranded on an island. It turns out that the island is actually all about these...

1. A 52.0 kg person takes a nap in a (lightweight) backyard hammock. Both ropes supporting the hammock are at an angle of 14.9° above the horizontal. Find the tension in the ropes. 2. A backpack full of books weighing 52.0 N rests on a table in a physics laboratory classroom. A spring with a...

Alright, this one has been bugging me for awhile now. "In the following addition, each letter represents a different digit. Find the values of the letters." .. S E N D periods are just there to push the "S E N D" over. + M O R E --------- M O N E Y Here's what I...

Q&a Game For Fun ! Ok... Just came across something weird and interesting in one of my physics books and I thought I'd share it and start one of those Q&A games I've seen on this forum! "When two parallel uncharged metal sheets are placed in a perfect vacuum, they attract each other with...

I have a lot of questions and I know I'm supposed to show all my work but the post would be insanely long, so I will show you what answers I have come up with on the ones that I managed to get that far. I know how to do these but I often get hung up on the fractions and trying to get rid of the...

http://www.kia-glitz.com/images/humour/0290.jpg http://www.kia-glitz.com/images/humour/0410.jpg http://www.kia-glitz.com/images/humour/0452.jpg http://www.kia-glitz.com/images/humour/boom.jpg http://www.kia-glitz.com/images/humour/Canine_Bark.jpg...

This one has about 50 questions on social and political issues. After you take the survey, your political compass is scored and shown relative to figures such as Ghengis Khan, Gandhi, GWBush, Chirac, Nelson Mandela, and so on. On another science board, all the scientists ended up in the same...

http://img62.imageshack.us/my.php?image=geometry9cn.png