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  1. Q

    Cyclotron exit energy

    Well, thanks a lot! i'm pretty excited too. actually, i'm on a training right now at an already set up facility so i can see how things roll and then i'll go back to where i live so i can use a recently set up cyclotron there. all i know about the optics of the beam is that it's a negative ion...
  2. Q

    Cyclotron exit energy

    btw, i'm going to check with the company that sold the equipment to see if they got more info on the beam optics they use. if i get to see anything interesting i'll post it here. thanks a lot btw for the MAD link and the book, definitively going to check them. Great resources for this new job :D
  3. Q

    Cyclotron exit energy

    yeah, that's what i thought too.. but that spread should be fairly constant (that's what i meant, sorry for being vague)
  4. Q

    Cyclotron exit energy

    unfortunately it's a medical facility.. however, the beam energy should be a constant since you can't modify the beam extraction radius.. there should be away around to figure out this, but as you said, it might not be an easy answer.. it would be easier to just make some experiments and fit...
  5. Q

    Cyclotron exit energy

    So, i'm beggining to work in a cylcotron as operator. Most of the crew here has technical education, albeit not quite a physics degree. When i asked what's the distribution of energies of the particles when they hit the target i got a blank look. How could i determine this? I'm guessing that...
  6. Q

    Undergrad publications

    You got it right on your first guess. Of course, i would read all about it if this goes on.. and i think he may be making us do all the writing stuff.. i suppose we'd be his flying monkeys if we do this :P hmm.. unless someone else comes in and shatter my slowly growing optimism, i'm starting...
  7. Q

    Undergrad publications

    well, it kinda feels like i'm ripping off a project my lab teacher started. He had troubles in his earlier attempts, so when they told him to think about a lab project so we could work on it, he just pulled this thing out. I heard is something not uncommon to just add students in teacher's...
  8. Q

    Undergrad publications

    it's been said on the lab today that maybe the lab work we're doing (i'm an undergrad, 4th year of physics) could be honed into a publication.. my lab partner was really excited about it, but i had my doubts because i don't know what are the future consequences of doing this. i never trust...
  9. Q

    Enthalpy of ideal gas

    oh, thanks! i just need to get the volume out of there, but i could use the other relations to do that. doh! i should've seen that earlier :P
  10. Q

    Enthalpy of ideal gas

    Hello. I'm having troubles solving the enthalpy for an ideal gas. From the equation H=U+PV, i could find H substituting PV=NRT = U/c, but then i need the energy as a function of S and P, so i'd get H as a function of its proper variables (S and P).. I can't find such an expression. It's just...
  11. Q

    Find the potential difference between a and b

    following what you've done, you need one extra equation. If you take the first two and substract them, you get 0 on one side, and a linear combination of i1 i2 and i3 on the other, so with the other equation you have in total two linear equations on three variables (i1, i2, i3), so you have...
  12. Q

    Finding Moment of Inertia of Infinitely Thin Hoop using a Double Integral

    I've found it! i'm gonna post it just ftw. I had some mistakes in my first post, for a start, the integral \int _{0} ^{2 \pi} x^2 \rho dt should be done with ds instead (so the \rho ds would give the mass of that bit, and all makes physical sense). Since ds = R dt we have: I_y =...
  13. Q

    Finding Moment of Inertia of Infinitely Thin Hoop using a Double Integral

    i've found this theorem helpful: http://www.rzg.mpg.de/~rfs/comas/lectures/SportundPhysik/materialien/Aerodynamics/Schulprojekt/Magnus/ajp00181.pdf [Broken]
  14. Q

    Finding Moment of Inertia of Infinitely Thin Hoop using a Double Integral

    I still got some doubts about this.. I've tried many ways to find the moments of inertia I_{x} = I_{y} but i always get some constants wrong. If i parametrize x(t) = R Cos(t) , what's wrong with taking the integral \int _{0} ^{2 \pi} \rho x^{2} dt ? If i do that, i get the correct factor of...
  15. Q

    All purpose pump

    you can always put it beneath somebody else's air conditioner :D
  16. Q

    All purpose pump

    hi, i still got to get my hands dirty and i can't find the time or motivation to get going (and i don't want to spend the money in buying materials unless i'm 100% sure i'm gonna go through the whole way). The end product i have in mind would be a tube section with a fan at the middle, and the...
  17. Q

    All purpose pump

    hi, i've been inspired by this wind generator design: http://www.instructables.com/id/Pringles-Wind-Turbine-Pleech---Version-One/ to make it operate in reverse, that is, feed alternating current and make the thing spin. The purpose of this is to make a pump by putting a wheel (similar to those...
  18. Q

    Short circuits

    well, i think i have some understanding on electricity. when i said no resistance i was really saying very little. but even with no resistance, i would get a pretty huge (infinite) magnetic field and the statement prevails.. i'm just joking too much i guess. all i wanted to know is how much...
  19. Q

    Electromagnetic Momentum and Energy

    thanks. those links really helped :)
  20. Q

    Short circuits

    awww... well, i guess i really should buy a transformer.. i can't find any of that wire used for inductances. the one that has this thin coating.. right now i'm trying with regular wire and some candle wax. do you have any experience in building inductances? (now this thread starts to drift off)
  21. Q

    Short circuits

    lol. i know :P (but that potential magnetic field stares at me very suggestively)
  22. Q

    2 adiabatic processes

    no, what i'm telling you is that in order to define heat, you need to define temperature, and temperature is just a way of forgetting about certain degrees of freedom and collapse them into what we call 'temperature'. So to define adiabatic, you need to define heat, so you need to define...
  23. Q

    Can an electrical signal be truly analog?

    :confused: i wonder what would happen when you add one electron, do you get the new 'mean' voltage inside the 'possible voltage strip' or a mean outside of it? if it lies within, then you couldn't tell how many electrons are inside the thing.. the quantum world is a ***** :rofl:
  24. Q

    Short circuits

    hey, thanks. this speaker is medieval in every way anyways so it'll be, as you say, a long way from a speaker. but i what i don't have is an amplifier :S i don't want to plug it right into the wall because i'm afraid i'll take the power off the house. what i'm wondering is how much current can...
  25. Q

    2 adiabatic processes

    how do you define heat? in wikipedia it says "the energy transfer due to a difference in temperature", and temperature is a statistical definition. so there would be no sense to state such a law without the statistical approach.
  26. Q

    2 adiabatic processes

    isn't that a restatement of the conservation of energy?
  27. Q

    How do you determine the amplitude of a wave exhibiting simple harmonic motion?

    i have no idea, but clear this up for me, is the string resonating on these frequencies? i think so, and if it is, the amplitud ought to diverge, am i right? i've thought about this for a while, for i needed to measure these frequencies on the lab and i wanted to know where to put the oscillator...
  28. Q

    Electromagnetic Momentum and Energy

    well, as far as i know, any EM field will have an energy associated with it. the expression for it would be (1/2)*\int E^2+B^2 This would be valid for any EM field, including light. the integral is taken over a certain volume, and you can get the energy density as the limit.
  29. Q

    Short circuits

    so, i'm pretty bored and decided that i want to make a speaker. i've bought some thick copper wire, and twisted it in the form of a coil, then twisted some more with a larger radius so i can put the first one inside the second one and so on.. my motivation to buy the thick wire was to maximize...
  30. Q

    Electromagnetic Momentum and Energy

    I've been presented with these concepts, and the first time i saw them i thought they were just mathematical mambo-jumbo, but of course i didn't gave much importance to these thoughts. I've been constructing an idea of these after seeing how they behave in different circumstances, but really, i...
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