What is Fun: Definition and 427 Discussions

Any one know of some good party tricks?

A surprisingly small number of photos submitted for a theme that is right smack in the middle of the summer months here in the northern hemisphere. Still, we have a good group of photos. Please choose a photo that best depicts the spirit of having fun in the sun. 1. matthyaouw 2...

Alright, not really homework or coursework. Sum(from k = 0 to infinity) (cos thetha)^2k = 5 So i subbed in the first value, 0 and took the one out. I have to find the value of cos(2thetha)and then there was a pattern, but i didn't really know what to do. Thanks P.S. Not really familiar with...

Fun in the Sun This week's theme involves all the fun activities we do during the warm days of summer. Zz. Contest Rules: 1. Any digital photo or digitally-scanned photo relevant to the theme will be accepted within the contest period. In case there's a gray area, or you're not sure...

Good Cartoons :) Ok, so some of you might think this is a wee bit childish, but there are some good cartoons that are out there, you have to admit :smile:. I love Jimmy Neutron :!) :-p It gets kids to like science, at a young age, I know I started to like science more, after watching it. It...

This is a bit weird, both are functions of theta (and time) ... so I assume the operator is on both ... is it a case of applying the product rule? \frac{\delta}{\delta \theta}(\dot{\theta} cos\theta)

Alright, don't take this seriously. This is just a what if situation calculation: So I was thinking. Atoms possesses charges. Particle possesses mass. Charges produce electric field while mass produce gravitational field. A changing electric field produce a magnetic field. What unique...

The first one I got from a book by New Scientist. For the first experiment you need a microwave oven, a chocolate bar and a ruler. You can use these to find the speed of light (c\ =\ 2.99792458\ \times\ 10^{8}\ m\ s^{-1}). Take the rotating tray out your microwave oven and place the...

[SOLVED] gravity fun Homework Statement 1. Calculate the speed of objects on the Earth's surface caused by the Earth's own rotation around its own axis. 2. Find the mass of the Earth using its time period of revolution of the moon around the earth. 3. Find the mass of the sun using the...

Homework Statement 1 (H_1 - H_2) \times \hat n = J_s 2 (H_1t - H_2t) = \hat n \times J_s How does one get from the first statement to the second statement? 3 H_{1t} - H_{2t} = J_s This is causing an interesting problem when I plug in numbers, I would have just left it with statement (3) but...

I'm creating this thread to get some ideas on activities I could possibly do. I love golfing, hitting the batting cages, going to the movies, snowtubing, hiking etc. I'd like to know some other activites that some of you consider fun to do.

http://www.fireworkspop.com/colortest.htm have fun

Describe a sequence of transformations that would transform the graph of y = 5cos3x into y = cos(3x + 6)

Does anyone know of any good number games or thinking games (i.e. tic-tac-toe) to kill time when you're bored? Something that doesn't even require a pen and paper if possible...

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...

Hi people! Well i don't know if all here know about the Project Euler (http://www.projecteuler.net/) but i think it is very useful because for all of us here know how to program numerical algorithms fine is very important. "Project Euler is a series of challenging mathematical/computer...

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.

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. Contest Rules: 1. Any digital photo or digitally-scanned photo relevant to the theme will be accepted within the contest period. In...

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...