Hi Definition and 274 Threads

  1. H

    Hi 2 Simple everyday things that I dont understand. Please help? Taps and vaccum

    Hello all Never occurred to me until a friend made fun of me for not knowing how a TAP and a vacuum cleaner works. And even I was surprised! How can I not know!? Question 1. I know that turning on the tap means increasing the pressure so water flows out, and the more you turn, the more...
  2. C

    Hi, i'm not sure how to prove this about buoyance

    Hi, I'm not sure how to prove this http://img402.imageshack.us/img402/5367/buoyancyq0wn.jpg I tried developing a bit but I'm stuck, can anyone point me in the right direction please thanks
  3. Evo

    Introducing bitjumper: A New Addition to Our Scientific Community!

    Everyone say hi to bitjumper! I've managed to lure, I mean invite, a good friend of mine here. He's been lurking for a couple of months, reading posts, getting a feel for the forum and you people have scared the bejeezus out of him! :biggrin: Now he's afraid to post. :frown: Come on...
  4. *Kia*

    Moving Pain: Wolram's Return Soon

    It is me wolram not kia, i am in the act of moving, a right pain in the ass, i have no internet, and i miss you all so much it hurts, i hope to be back online some time, but not sure when, but i will smite any anything that gets in my way :smile: to say i will be back, may send shudders down...
  5. M

    Hi friends about metallurgical & materials engineering

    I'm studying at Physics ,but I am interested in materials engineering,and I want to learn more about M.M.E.in the world. :confused: thanks, maria
  6. K

    Welcome Back! Introducing Dr. Kam: A University Student Studying Medicine

    I hope you guys still remember me. I do miss you, and of course I miss PF as well. :shy: Also want to say hi to those who don't know me. :smile: Just a brief introduction of myself. I'm a rather old member here but have left here for about a year, and now I'm back! Why have I left? A long...
  7. E

    Solving Physics Problem: Find Coefficient of Friction

    Hello all, I'm new to this site and think it's a great idea to have a Physics site to help with, b/c we all know physics is the devil... (j/k) :) Anyway I have this problem which I think i figured out but want to be sure. Suppose a block of mass 25 kg rests on a horizontal surface...
  8. H

    HI clouds in the center of the Virgo cluster

    This paper http://arxiv.org/astro-ph/0505397 reports the discovery of a HI cloud near the center of the Virgo cluster. According to the morphology and kinematics of a plume in a nearby galaxy (NGC 4388), it is assumed that tidal forces or the pressure of the ICM gas have stripped this HI gas...
  9. P

    Hi, does anyone know the character table for the inversion group?

    hi, does anyone know the character table for the inversion group?
  10. A

    News Will Mr. Bush Attack Iran? - Ardian's Opinion

    Hi everybody, what do you think will Mr. Bush next move is he going to attack Iran? I have heard some rumors that U.S.A. troops are trying to find a pretext, (justifications), in order to attack Iran, as they did for Iraq, will they? I think they are just mad about the petrol nothing else...
  11. S

    Hi 2 Every1 Can Some1 Please Plaz Help Me?

    HI TO ALL, THIS IS SAIRA, I AM NEW HERE. I AM REALLY WORRIED AS I HAVE A PHYSICS ASSIGNMENT AND I AM REALLY STRUGGLING BECAUSE I MISSED ALOT OF LESSONS BECAUSE I WAS ILL. COULD SOME1 PLZ HELP ME WITH THESE PROBLEMS, I WILL BE EVER SO GRATEFUL! 1. A boy throws a stone from the edge of a...
  12. T

    Hi, quick problem regarding emission of gamma ray.

    A Fe (57) atom is in an excited state 14.4 keV above the ground state. The nucleus decays to the ground state with the emission of a gamm ray. What's the recoil speed of the nucleus? I'm not sure how to set this up. I thought a photon would have no mass, therefor no momentum. If so I...
  13. B

    Who is the new university physics student on the forum?

    Hello everyone ! I've just joined this forum.I am a university physics student.Just wanted to drop in and say a big HI ! to everyone !
  14. S

    How is the doctor related to the boy?

    Hi all, I am a nwebie for this forum... Let me start with some goqd sense! Try to answer this simple question without thinking much okay? A father and a son are traveling in a car unfortunately the met with an accident. Father died on that spot but the son was carried to the hospital...
  15. V

    Are You From America or Britain? Say Hi to a Newcomer!

    I'm new here so i just thought I'd say hi. It's a bit scary 'cos you all seem to be from America and I'm a Brit born and bred. :biggrin: I'm sure you are all very nice people though! Luv vix :wink:
  16. C

    What is the meaning of E in calculator notation?

    Hi, I'm sorry if this is a really dumb question... how do you compute 10E4.2 on the calculator? thanks in advance.. cseet
  17. P

    Who else works with electronic attack systems like the EA-6B Prowler?

    Hey, just joined the site, actually just found out about it! I'm glad I did, I haven't read about physics since college! I miss it, does that make me weird? Probably not here right? Anway, I fly EA-6B Prowlers for the Marine Corps as the ECMO(navigator and Electronic Countermeasures Officer)...
  18. M

    Hi again, here is my problem and my efforts

    i wish i could find a solution for that poblem it is about inverse function: Show that the function has an inverse function, and find [(d/dx)f^-1(x))] x=a for the given number a f(x)=e^3x + 2e^x - 5 , x>=0 , a=-2 Here i proved that the function has an inverse by finding...
  19. I

    How Do You Calculate the Force of Friction on a Curling Rock?

    I have this assignment to do and I am stuck on finding the force of friction acting on a curling rock. The mass is 19Kg and the acceleration is -0.2m/s^2 I calculated the force applied using F = ma This gave me -3.8N I let negative rep force applied positive rep force of...
  20. S

    Is False Equivalent to Not True in Quantum Mechanics?

    If False the same as Not true? Undoubtendly, this is a question in Quantum Mechanics which was why I put it up here and not a Philosophical Question though it may sound like one... Sridhar
  21. R

    What can I expect to learn about Physics and Calculus on this forum?

    Hello everyone, just wanted to stop by and say Hi. Seems like a very nice place here, did sign up a last year but account got deleted somehow so yeah... Anyway, chances are that I'll be starting thread asking for explinations on the many aspects of Physics that I do not understand. Been...
  22. D

    Hi, I'm in AP Calculus and I feel really stupid

    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 :))...
  23. T

    Looking for a Helium Neon Laser? Welcome to the forum!

    Hi, i just stumbled across this site while looking for a helium neon laser. Anyways, I'm not sure if this forum is the right place to introduce myself but ill give it a shot. Let's see, I'm most interested in sound, optics and high voltage toys, heh. Well I'm sure i'll be posting here with some...
  24. Simfish

    Hi; I have a question here About Intel Science Talent Search

    I'm new to the forum here; so I might say hi here.. I have a great interest in Science; and am highly ambitious; althoug I am a bit indolent in body, seeing that I never exercise. ^^ May I ask this question; and could you all also give some essential information to a newbie on these forums...
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