Search results

  1. G

    Finding mass of paperclip using Millikans theory

    Assuming all the paperclips weighed the same, wouldn't it be fair to say that the mass of an envelop filled will a random number of paper clips will have a mass equal to the sum of the mass of the envelop and an integer multiple of the mass of a single paperclip? In otherwords, if the mass of...
  2. G

    Frictionless physics problem

    1) Here are the equations you need: Circumference = 2*pi*Radius Speed = Distance / Time Centripetal Force = Mass * (Speed^2) / Radius So, if you know the Centripetal Force, what do you think the tension on the rope would be? 2) You should be able to use the equation for centripetal force I...
  3. G

    Proof: 0.9999 does not equal 1

    You are correct, I only proved that a proof commonly used is incorrect. The title was misleading.
  4. G

    Proof: 0.9999 does not equal 1

    http://en.wikipedia.org/wiki/Reductio_ad_absurdum
  5. G

    Proof: 0.9999 does not equal 1

    The function y=1-1/x is often used to show how the repeating decimal 0.9999... is equal to 1. When x=1, y=1; x=10, y=0.9; x=10000, y=.9999, and so on. The limit of 1-1/x as x approaches infinity equals 1. An assumption is often made, however, that if the limit of an expression as x approaches...
  6. G

    Digital and quantized signal, are one same thing?

    Generally, yes, but it depends. Digital audio is a quantized signal, but class D amplifiers (which quantize in the time dimension) are not considered digital. I guess you could think of digital as complete quantization.
  7. G

    Classical Physics with Time going Backwards

    http://scitation.aip.org/getabs/servlet/GetabsServlet?prog=normal&id=AJPIAS000074000004000313000001&idtype=cvips&gifs=yes [Broken] From abstract: "the equations of motion of charged particles are invariant under time reversal" If only I could read it without paying $$$. Was there something...
  8. G

    Classical Physics with Time going Backwards

    I thought magnetism just negated.
  9. G

    Classical Physics with Time going Backwards

    Of course that goes beyond classical physics. As far as we are concerned, the exact path taken by a boulder as it falls off of a cliff and smashes is reversible.
  10. G

    Classical Physics with Time going Backwards

    Well, any scenario where time goes forwards also follows the laws of physics with the same scenario running backwards.
  11. G

    Classical Physics with Time going Backwards

    First, what does it mean for time to be going backwards? Basically, any time there is a reference to time, we just need to negate it - so time will have a negative effect of what it usually would. Velocity (1D): There is an object that moved from A to B in time t at a constant speed. If we...
  12. G

    Distribution of Primes

    Yeah, I neglected the "at least for small numbers" in my second post.
  13. G

    Distribution of Primes

    I know. It's more likely than random, but that's about it.
  14. G

    Distribution of Primes

    I made this simple program to list all non-primes (ignore the first row and column of the output) and list what I call "important numbers". I have attached an output if you don't want to bother running and compiling the program. #include <iostream> #include <fstream> using namespace std...
  15. G

    Excluding Evidence contrary to Theories

    That doesn't seem like it could be it. In this video, it doesn't look like he is holding anything: Of course he doesn't show any of his wiring and cuts out the video frequently, so it's certainly possible he has a hidden power source somewhere. I just don't understand why that MIT professor...
  16. G

    Excluding Evidence contrary to Theories

    This one: https://www.physicsforums.com/showthread.php?t=213780 Of course the evidence is not the most reliable, but I would think a discussion on its reliability would at least be allowed.
  17. G

    Excluding Evidence contrary to Theories

    Recently, a thread here was closed because it linked to an experiment that seemingly conflicted with the currently accepted theories. While the majority of people agree with these theories, I think it is an injustice to censor evidence that is contrary to a theory - otherwise human knowledge...
  18. G

    Canceling out low frequencies noises (subwoolfers)

    You could always just go talk to the guy and tell him it's bothering you. That's better than calling the police over it. Other than that, you could decrease the air pressure in the room you are in :D
  19. G

    Wavelength in Orbit

    I'm not asking a question, simply making an observation. As for the diagram, the three rectangles on top of each other (labeled 1, 2, and 3) are sequential images of the impulses advancing and the object moving perpendicular to the direction of the wave. In frame 1, the object is experiencing...
  20. G

    Wavelength in Orbit

    Have a look at this diagram I made: http://la.gg/upl/wavelength2.jpg [Broken] The scenario is that you are in circular orbit around the Earth and a radio signal is sent from the center of the Earth. If you have a clock with you that is synced up to a clock on Earth (we are ignoring relativity...
  21. G

    C/++/# C++ Matrix Solver

    I just thought I'd post this here. It will help you solve a matrix by getting it into row-echelon form (well, close to it anyway). I avoided global variables and tried to make it as expandable as possible. #include <iostream> using namespace std; void output(int height, int width, long...
  22. G

    Quick question about light waves

    They would return to the values they had before entering the glass, as you suspected. EDIT: Looks like Claude beat me to it
  23. G

    Blueshift + Classical Physics = Golden Ratio

    L is the distance from (A) to (B) that observers on (A) would measure if only classical physics applied and both (A) and (B) were stationary. L is not the distance of (B) away from (A) at the time of the emission of the light signal, but the distance of (B) away from (A) at the time of the light...
  24. G

    Blueshift + Classical Physics = Golden Ratio

    I was doing calculations to see how far classical physics would take us in terms of the speed of an object never exceeding the speed of light in a reference frame. Here was the scenario I set up: http://la.gg/upl/light.jpg [Broken] So, if we want to find the time it takes the light to get...
  25. G

    Rearranging an equation

    Well, it's good he decided to chroot before doing an rm -rf /* :smile:
  26. G

    Chain consisting of five links

    You can use a singe F=ma to describe the net force applied to the entire chain, and if the only forces acting on the chain are the force pulling the top link pulling up and graving pulling the entire chain down, the net force acting on the chain = the force pulling up on the top link of the...
  27. G

    Diffusion of Different Gases/Particles through Air

    If something like oxygen were to be released into a room, it would diffuse much faster than something like a heavy smoke. Has someone ever measured the rate of diffusion of different gases and particles? A quick Google search turned up nothing. I'd like to know the distribution of how many...
  28. G

    Some true and false questions

    :D Already made the edit
  29. G

    Some true and false questions

    You are definitely right about #1 #2) You are right #3) If this question writer is an a$$hole, he may count a net force of zero #4) You are right about this one. The forces would be equal #5) You are right #6) Ah, speed is used instead of velocity. Velocity is a vector, while speed is a...
  30. G

    Some true and false questions

    It looks like you have the right idea.
Top