What is Fun: Definition and 427 Discussions

Hey, here's a fun problem many of you would probably enjoy trying. I've done it myself, and it truly is a fun problem to do. Here it is: We have an initial amount of 800 gallons in a tank at 8:00 in the morning on any particular day. 35% of that 800 gallon solution is acidic. Spigot A is...

A duck has a mass of 2.9 kg. As the duck paddles, a force of 0.11 N acts on it in a direction due east. In addition, the current of the water exerts a force of 0.19 N in a direction of 57° south of east. When these forces begin to act, the velocity of the duck is 0.13 m/s in a direction due...

i need help with maple. its for college. i have no idea what i am doing. can someone help me get that. i tried to get the ans but i just don't get it. Thanks if you can help me out. here is the problem. lolz its not that big. i have the ans for what i tried that's why its big...

I actually managed to get my Jeep stuck last night ... in a parking lot, no less. That's the first time I've ever managed to get stuck. It was hard to gauge the depth of the snow in an unplowed lot, and I wound up a little too close to the building where the snow was a little deeper. That...

Homework Statement Find the work done by the force field F(x,y) = x*sin(y) i-hat + y j-hat on a particle that moves along the parabola y = x^2 from (-1,1) to (2,4). 2. The attempt at a solution Please see attached file. The answer I get seems really, really, complicated and I have a...

I was bored and looking at youtube videos, thought some might enjoy this video:

Hello everyone. I am having some more card troubles. This is suppose to be on how many ways can a certain hand be constructed. b: A straight flush can be constructed by choosing a suit in 4 ways, and choosing the lowest denomination in 9 ways (from A, 2, 3, 4, 5, 6, 6, 8 or 9, but not 10...

Hey guys, I was doing some Putnam questions for fun and came across something strage to me. In the 2005 Putnam competition, question B3, link provided below: http://www.unl.edu/amc/a-activities/a7-problems/putnam/-pdf/ I solved it by guessing a polynomial solution and then verifying the...

Hello, here is the exercise from the book: ---------- Let (a_{n})_{n=0}^{\infty} be a sequence which is not bounded. Show that there exists a subsequence (b_{n})_{n=0}^{\infty} of (a_{n})_{n=0}^{\infty} such that the limit \lim_{n\rightarrow \infty} 1/b_{n} = 0. (Hint: for each natural...

:smile: How do i find the velocity of a block of mass 100 lb being dropped a distance 5 ft onto a spring whose stifness is 100 lbs/ft after the spring has deformed 4 in? im sure it has somthing to do with work of a spring force but i don't know exactly how. any ideas?

Hello everyone 'im not sure if this is right or not, its about 4:00am so bare with me on typos. Let S = {a,b,c} and let S_a be the set of all subsets of S that contain a, let S_b be the set of all subsets of S that contain b, let S_c be the set of all subsets of S that contain c, and let...

They brought it onto Comedy Central two times a day, YES! [PLAIN]&mode=related&search=[/URL] [PLAIN]&mode=related&search=[/URL] [PLAIN]&mode=related&search=[/URL] [PLAIN]&mode=related&search=[/URL] I love Dr. Cox.

"Two boxes, m1=1.0 kg witha coefficient of kinetic friction of 0.10 amd m2=2.0 kg with a coefficient of 0.20, are placed on a plane inclined at 30 degrees. (a) What acceleration does each box experience? (b) If a taut string is connecting the boxes with m2 farther down the slope, what is the...

http://us.mms.com/us/dark/ there's a bunch of images that represent movie titles(mostly horror movies or something of that nature) I'm stuck on 26

they just had another episode of the weekly International Loop Gravity Seminar to follow the discussion it helps to read the slides first and then as Rovelli gives the talk he refers to the slides so you can see what he is talking about it is new work so there is plenty of reason to ask...

Years ago I hunted and shot guns with regulatrity but just 20yrs ago I sold my sweet little Ruger 10-22 and have not fired a shot since. A friend and coworker has been trying to get me out black powder shooting for several years now. Finally, yesterday we "got 'r done" Here I am holding a...

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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...

1 .city in Ukraine that was the cite in 1709 of the battle_________ between Russia and Sweden. 7 letters. 2. Member of a native American people inhabiting the south western US and N Mexico. 6 letters. 3. The _____ _____, novel by Dashiell Hammett whos central characters are Nick and Nora...

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...

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 start: 1...

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^...