Stupid Definition and 300 Threads

Hi all, I have been studying for my physics final which is tomorrow for the past 9 hours..my brain hurts...sorry if this question is dumb I keep getting f=freq T=period mixed what is the difference between the two again in the physical sense (i.e. would the motion of pistons in a...

Gday guys, Im having trouble finding the forces in this truss. I feel really stupid, I should be able to do this. Can you guys give me a hand starting off? Cheers. :blushing:

Far more specifically (title was just to get attention)... Why is it that people exhibit the following behavior... You and a friend walk into a store full of vases. You want a specific one and you ask your friend to help. You tell them "I want this vase, its all red but has a green flower on...

I was writing an essay, and i realized...i don't know how to use the verb, "seek" in past tense. I looked in the dictionary, and it only had "to seek" "seeker" "seeking" "seeks", but no "seeked" or even "sake". What is the past tense for "seek"?

Okay, I feel really dumb, because this seems like something I should know, but I don't. So, here's my question. Suppose I have d2y/dx2, x = x(z), and z = z(x) How do I find d2y/dz2? Here's what I did: dy/dz = dy/dx * dx/dz d2y/dz2 = d/dz ( dy/ dz ) = d/dz (dy/dx * dx/dz) = d2y/dx2 *...

Who here has ever lived with someone that was a complete pig? My roomate is starting to really piss me off. I clean the dishes everytime and in less than 24 hours there is another full sink because my roomate doesn't ever do the dishes. We have a freakin dishwashwer for god's sake. He can't...

I was wondering how set theory could be categorized. I've heard that category theory can serve as an alternate foundation for math. But a fundamental symbol in the language is ∈. How is this done with arrows? I was trying to figure out how arrows might be elements of a set (that isn't not...

Actually, the real question was too big for the subject. It is: "How many people in your physics and chemistry (and other science) classes just memorized equations, and actually had no idea how it worked or what the equations meant?" For me, around 50%. Which is pretty funny when the...

ok this stupid program is starting to piss me off again (sry for the french) ok the question is: What tangential speed, , must the bob have so that it moves in a horizontal circle with the string always making an angle theta from the vertical? Express your answer in terms of some or all...

Ok so the question is: Consider a problem in which a car of mass M is on a road tilted at an angle theta. The normal force: And the choices for answers are: N=M*g N=M*g*cos(theta) N=(M*g)/cos(theta) is found using sum vec{F}=M * a from my calculations, i get that...

This sounds like a stupid question. However my teacher didnt really explain it well. Its my first day back at school, cut me some slack thx. - Calculate the frequency of a lightwave of wavelengh 500nm. Travelling at speed of light (3x10^8 ms-1) ----------------------------------------- I...

Need help! My friend thinks coin flips are 50-50! Alright, I've been trying to convince my friend that the outcomes of a coin flip x times in a row affects the x+1'th time. If you flip a coin 4 times and they are all heads, the 5th time is more likely to be a tail because if the coin is even...

How fast must a pion be moving in order to travel 15 m before it decays? The avg lifetime, at rest, is 2.6 x 10^-8 s. The answer is supposed to be 0.89c This sounds so easy. Like, just plugging in the formula but I'm not getting it. I haven't done relativity in so long. I think I must've...

How do I solve the following equation? 8n^2 = 64 n lg(n); (0 < n) n = 8lg(n) 10^n = 10^8 n ...? How do I isolate n?

You know the one. You have to bring a wrapped gift for the office holiday party, then you draw a number, and when your number comes up you have to pick a gift or steal one from somebody. Does anyone want a USC mug?

Yo. Curious about two things.. First, is it possible to use a method such as differentiation from first principles (the whole lim_{\delta\rightarrow0}\[f(x+\delta)-f(x)]/\delta thing) to differentiate trigonometric functions? Or is everyone stumped with memorizing them? (I'm curious about...

I hate how my school has a "core" requirement of liberal arts classes that are more of a pain in the ass, than a learning experience. I only take 2 classes that are related to my major while the other 4 are worthless classes that are required. Why do I pay for all these courses that will have...

Few stupid questions about polar curves and stuff... Okay, here's the first dumb question. I have to find the tangent line where r=2-3sin(T) at the polar point (2,pi). To find the slope, you just take dy/dx, and I come up with 2/3. I know that part is right. T=theta (I know it's spelled...

I'm not quite sure how to get started on this problem... a baseball is struck by a bat, and 3 seconds later it is caught 30m away. now the questions ask for it's final velocity, it's angle as it left the bat, the greatest height it reached, and the X and Y components of it's velocity as...

The Uncertainty Principle says, in so many words, that if you use a shorter wavelength of light you obtain a more accurate value for the position of the particle, and that if you use a longer wavelength you obtain a more accurate value for the momentum. Of course the more accurate you are with...

a 1.5 kg brick is dropped vertically onto a 2.5 kg toy truck, which is moving across a level floor at 0.80 m/s. With what velocity do the truck and brick continue to movie, after the brick has landed on the truck. i've dealt with only horizontal movements andd i haven't covered this yet in...

i was just watching gone in 60 seconds on television. in the movie an actor is standing on a platform and someone swings a crane's claw into him at approximately 15mph to knock him off the platform. this started an argument between my roomates and I about whether or not the weight of the claw...

Look woman, we aren't stupid. We didn't vote 9/11. We didn't vote Bush to stop gays from Marrying. I am so sick of people who do not understand the American political landscape, and who are obviously EXTREMELY confined in their thoughts, trying to come up with one reason on why Bush won. If it...

if you have \int_frac{y}{x}=int_L, if you multiply the LHS by c within the integral, is L multiplied by c within its integral?

Let's face it, if you have to ask a question then that means you don't know the answer, right? So you must be stupid, right? Right?

As you can tell, not my favorite subject. I was going along fine just tinkering with these things and working them out until I started trying to balance this one: Ca3(PO4) + H2SO4 -> CaSO4 + H3PO4 The coefficients I have tried so far are: 2Ca3(PO4) + 3H2SO4 -> 6CaSO4 + 2H3PO4 so...

SO. a ball is suspended by a string from the ceiling, and held at angle theta to the vertical by another string that is attached to the wall nearby... the string attched to the wall is cut and the ball swings like a pendulum, at the farthest it is theta from the vertical on both sides...

we just started our calc class, and our teacher gave us this question im sure it is really easy, and i don't know why i just can't get it analytically the question is solve 1 - < 3 solve for positive and negative case. x the positive value is easy, X> 1/3 . How would you...

Over the past year, I've evaluated my own research and observations and matched them up with some statements from a pair of friends. One worked on a nuclear sub, and the other worked on an aircraft carrier. Both worked in the nuclear engine rooms. As I've been refining the concept of...

Dozen of science site, offical or not, are saying that moon is always the same apparent size. Most of these site are explaining the perception of size as a simple legendary optical illusion. Some personnal experience lead me to believe that it was not! After about 6 month waiting, I finally...

I like to play with things. Magnets are so fascinating I buy them all the time. I know I should put my toys away when I'm done, but they are just a couple of small magnets so it shouldn't be a big deal. My girlfriend is a clean freak, she can't stand things not being put away. Last night I went...

nice title huh, ok now i know that by saying this I am getting the instant reputation of an idiot, believe me, i know about einstein's theory of relativity and the first 2 laws of thermodynamics, but believe it or not i have made a perpetual motion mechine. at this point, i bet most of you are...

When I first heard of fruitarianism I thought it was a good idea. I haven't found information that says just eating fruits is insufficient to stay alive. Fruits taste better than vegetables. Now we see that vegetarians are idiots. Hehe, just kidding. I like the taste of meat, but I enjoy most...

Solving Algerbraiclly...Nevermind! It seems I always try a different section of the forums just as someone is answering my out of place one... Haha...

Could you explain me how does Light reflect on a mirror? I assume that Compton effect on electrons is the only way for light to come back to my eyes but in that case, there would be a change of frequency of the photon (and a change of color). Does it mean that it is not me in the mirror ...

We're doing a bit about circles in Pure Maths at the mo and everything's fine about intersections etc until today the lecturer rammed up an easier eqt to tell if a line cuts a circle at 2 distint points or not. We had to show that the line 3y=x+5 cut the circle x^2 + y^2 -6x - 2y -15 in 2...

is there a difference between decelaration and a deceleration force or are they just the same thing? thanx(an don't laugh)

hello! I'm new on this forum. I am currently building a paper rocket. Just a question (if you can please help): how much weight do you think spray paint or permanent marker will add to the paper rocket? Thanks in advance,

K = \frac{f_F}{1-f_F} OK, I feel like the stupidest person ever, but if I know K, how do I find fF? I even know the answer.. if K = 0.504.. fF will be 0.335.. which is 33.5%, the other fraction is 66.5%, which is 0.504.. Still can't figure how to solve the formula :(

See http://neko.mi.org/~tawollen/humor/msg02033.html Regards, Carlos Hernandez

I was reading something and it said some people rinse their hair with vinegar after washing it with shampoo because shampoos are basic but it never said why they rinse it with vinegar. Do anyone know why they do that as i found it quite odd?

Stupid Amplitude...HELP! So I am working on some phys homework and I had a question about this problem: If the Amplitude of a sound wave is quadrupled, by what factor will the intensity increase? And I thuoght that the relationship between Intensity and amplitude was that Intensity is...

Has this ever happened to you? Or am I unique or just stupid?? I went to the refridgerator to get myself a drink of soda pop. Unfo rtunately there was no soda. I realized that when I got home from the store I had place the warm 2 liter bottle of Pepsi in the freezer. I opened the freezer and...

I have started this thread to show the stupidity in modern tech lawsuits and how it is affecting innovation and progress. Please post your stupid tech lawsuits. 1) Parents Sue School Over Use of Wi-Fi Network Aparently, the parents believe that Wi-Fi is hazardous to our health and are...

if everyone in the world were to jump up at the same time would that affect the Earth in any way?

Hi, I'm in AP Calculus and I feel really stupid :( I feel really stupid because it's only the first week of school and I'm struggling with the review (I forgot a lot over the summer) I'm posed with these two problems (in addition to many other but I don't want to bore you all :))...

well i know I am wrong somewhere so show me where... couldnt we calculate the size of the universe by taking the speed of light and the estimated age of the universe (14.5 billion years) and consequently use 14.5 billion light-years as a radius and put it into the old spherical volume...

So, I'm in the grocery store one day, and a precious, little six year old girl asked her useless, dreadlocked, most-likely-unemployed father if they can reinact a science experiment she saw on television. He asks, "Is this for school?" She says, "no." He literally says, "Then NO! You...

I have been on the Forums for a long time, and I have seen a lot of acrostics, and abbreviations. But I just can't figure out what IIRC stands for . Can someone tell me please?

Woohoo, a brand new forum to post in! Just thought it didn't feel quite right without this here. So in the tradition of PF 2.0 ask a stupid "quetion" and get a stupid answer back. So to begin... How long do you think it takes to reach a 1000 posts in this topic again?