Fun Definition and 407 Threads

You can get one of these spiffy Rockwell automotivehttp://ca.youtube.com/watch?v=lVZ8Ko-nss4" but you'll still have to goto a Rockwell automation dealer.

http://sheol.org/throopw/tachyon-pistols.html Its stuff like this why I want to study physics.

[SOLVED] Finding Tensions IS SO FUN Homework Statement Find tesnions T1, T2, and T3 and M in figure attached... Homework Equations The Attempt at a Solution To start i drew three FBD A) for mass on left Fm= T2-m*g = 0 B)the intersection Fx = T3 cos 37 - T2 cos 63 =...

Hi, so I am currently an ug, and I've been offered positions to do particle physics research. The thing that is turning me off is that it's mostly computational work in C++. I don't know how much i'll enjoy working at the computer all day, but the idea of studying what makes up matter is...

Homework Statement Show that \frac{z}{(z-1)(z-2)(z+1)} has an analytic antiderivative in \{z \in \bold{C}:|z|>2\}. Does the same function with z^2 replacing z (EDIT: I mean replacing the z in the numerator, not everywhere) have an analytic antiderivative in that region? Homework...

I was really bored one day, and I decided to make up this question for fun. It's actually pretty easy and I was able to solve it using nothing but high school algebra, but what makes the question interesting is just the conceptual aspect of the question: A team of astrophysicists are stranded...

I don't adhere to any religion nor have I been conviced there is a God. However I have recently decided that in order to better understand human history and current world affairs it would be very benefical to read the major holy books. My GF is currently reading the Bible and I am about 100...

Did you chat today? Did you like it? I thought it was kind of fun.

I am hot but I need fire, I am tall but I need to jump, I am long but I need to stretch and I am slimy but I need slime, I am full but I need fuel. I end in X. What am I?

I'm sure everyone here loves to do physics at home. This weekend I made a cheap http://www.cymek.com/?q=node/109", but I want to know what other physics related activities people are doing at home.

Conductors and Equipotential Lines - Fun! Homework Statement Consider the following two conductors. conductor A is grounded so that it has a voltage of 0 V and conductor B is charged up so it has a voltage of +20 V. Draw in the equipotential lines and then draw in the E field lines indicating...

The purpose of this thread is to describe certain interesting aspects that are explicit or implicit in the “standard model” of cosmology for a flat universe, by reference to the Friedmann equations. I hope to provoke more interest and constructive dialogue about the substance of this topic...

Homework Statement Around one of our buildings we have an "ant channel" of roughly square cross section (say 20 cm x 20 cm) with fish in it to control the mosquito larvae. The surface of the water carries particles giving a good indication of any surface movement. Late one afternoon we...

Would I be able to buy current computer hardware and mod the hell out of it? I.e. overclocking through the BIOS, but if that ain't enough would I be able to tweak the hardware to make it run even faster? Without going insane (no liquid nitrogen!) What other kinds of tinkering can I do with the...

Homework Statement Show that \int_{0}^{\pi} {\cos}^{2n}\theta d\theta = \frac{(2n)!\pi}{{2}^{2n}{(n!)}^{2}} Homework Equations cos n*theta = (z^n + z^-n)/2 The Attempt at a Solution Ok, this one has kept me busy for a while. I started using de Moivre's theorem to express...

Hi SpaceTiger, Pervect & Hellfire, Here are some follow-up thoughts about the Friedmann equation for expansion. Pervect, thank you for using Noether's Theorem to demonstrate that normal momentum (of movement) is conserved. The next challenge is to demonstrate that the "momentum-like"...

a car is moving at 56km/h when a deer jumps onto the road 65m ahead. after a reaction time of t seconds, the driver applies the brakes to produce an acceleration of -3.0m/s^2. what is the maximum reaction time allowed if the car is to avoid hitting the deer?

[SOLVED] Fun ski area problem Homework Statement A T-bar tow is planned in a new ski area. At anyone time, it will be required, to pull a maximum of 82 skiers up a 609-m slope inclined at 14.1° above the horizontal at a speed of 2.37 m/s. The coefficient of kinetic friction between the...

I am driving a drum head with a rod. The rod goes up and down as the radius of a disc changes length (please see attached PDF). There is a gradual raise of the drum head, and then an abrupt drop. But there is a kink that the rod needs to overcome. Any suggestions on how to achieve this...

The following is an interesting exercise... You answer a few questions then click the "find your candidate button" and the program selects the candidate who's position on the issues is most like your own... http://www.wqad.com/Global/link.asp?L=259460 My top three were: Rudy - 31...

FUN 1d motion prob--help Homework Statement The figure (http://img471.imageshack.us/my.php?image=picprobfd5.png) shows a general situation where a stream of people attempt to escape through a door that is closed. The people move toward the door at a speed of v = 3.50 m/s, are each d = .25 m...

... the book is tiny ... (sure it has lots of advanced material) but wow ... $150 new on Amazon, for something you could lose to your couch? crazy.

Every morning at seven o' clock There's twenty terriers drilling on the rock. The boss comes around and he says, "Keep still And bear down heavy on the cast-iron drill And drill, ye terriers, drill." And drill, ye terriers, drill. It's work all day for sugar in your tea Down beyond the...

Why is nasal congestion due to a cold so much worse inside than outside? (Or is it just me?)

So today I was doing a problem out of my book for practice, and I came across some interesting results. Show that among any group of five (not necessarily consecutive) integers, there are two with the same remainder when divided by 4. a set of consecutive integers 1 mod 4 = 1 2 mod 4...

Grad school question - GPA, deadlines, etc... LOTS OF FUN STUFF! I have one year left of school. Soon, I will be applying to grad school. My first ~1 year of school I did not do very well. I was at that time a Computer Science student, and I really just hated my classes, the math, physics...

has anyone heard about dipping a can of shaving cream in liquid nitrogen, stripping away the metal and then placing the remains in a car. The effect is supposed to be that the shaving cream expands to such a great volume that it fills the entire car. If this is possible I was wondering if the...

Show that for any n>1 we can construct a positive integer consisting of only 1's and 0's such that this integer is a multiple of n.

[FONT="Comic Sans MS"]Now That Looks Like Fun Your pictures must contain something that would be fun to do. It would help if there are actually people having fun doing it. [SIZE="4"]Contest Rules: 1. Any digital photo or digitally-scanned photo relevant to the theme will be accepted...

After all, tenure is incredibly hard to get - and most people who strive for it don't earn it. So for those who couldn't get tenure (and a lot other interested people) - do they still read research journals for fun? (or say, read through graduate level textbooks in other fields for fun)...

[a]1. Calculate the distribution coefficient (Concentration of benzoic acid in dichloromethane: Concentration of benzoic acid in aqueous layer[/b] Using: molecular weight of benzoic acid=122 Concentration 2.4g/L Average titre with 0.02M NaOH (39.25 x 0.02)/1000=0.000785 C6H5COOH +...

what kind of fund stuff do you get to do as a nuclear engineer?

Well my engineering degree only required Physics 211 and 212 (Basically, most of the Halliday/Resnick Textbook) and I've already finished them. All of my remaining courses, if they introduce any new physics will be in the engineering context. But, I'm still am very curious about general...

OK, so who else is having a Snow Day today? Argonne is scheduled to open at Noon the earliest (I have doubts that they will). So I'm taking the day off. This means that I will be bored all day and will hang out even more on PF. This may or may not be good! :biggrin: I'm just glad I'm...

Hi! how's everything going? i just made a small program which gives you something to do on the computer when you're board (or waiting for something to finish). The program put's an animated sheep on your desktop that you can catch with the mouse and throw around to make it bounce of the sides...

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 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...

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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