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  1. J

    Thin Film Interference- Transmission

    yes! The answer is 601 nm. If you take the wavelength and times it by the index of refraction of water (1.33), you get 150.29. Multiply that by 4 and get ~601 nm. Don't know how that fits into the formula of 2T = wavelength / something (in example its over 4 or 2, don't know how to get that...
  2. J

    Thin Film Interference- Transmission

    Homework Statement A thin layer of water (n=1.33) is surrounded by air what wavelength of light will not be transmitted through the water at the point where the water is 113 nm thick? The Attempt at a Solution - In phase - Path difference of 2T. - Constructive Interference I just...
  3. J

    Relativistic Velocity Transformations

    but if I used that formula, wouldn't it give me a speed relative to the earth? Or would it be relative to the quasar? :O
  4. J

    Relativistic Velocity Transformations

    A quasar is moving away from the earth with a speed of 0.850C. It emits a proton that eventually reaches earth, and is travelling at a speed of 0.519C relative to the earth. How fast is the proton moving relative to the quasar? Is this answer as simple as it seems? is the answer simply...
  5. J

    Basic relativity question (probably easy for everyone on here xD)

    i don't know what it means? it's on the formula sheet there is an example using it. all i want to know is the speed of the proton relative to the quasar... QUASAR<-0.85c-<QUASAR "shoots" PROTON>0.519>PROTON <EARTH> the velocities are relative to earth. THERE! I DREW IT OUT :) Does...
  6. J

    Relativity and Time Dilation

    it's his stinkin isu for grade 12 physics. we are given a booklet with a few examples but its really complicated stuff.
  7. J

    Basic relativity question (probably easy for everyone on here xD)

    A quasar is moving AWAY from the earth with a speed of 0.850C. Itemits a proton that eventually reaches the earth, and is travelling at a speed of 0.519C relative to the EARTH. how fast is the proton moving RELATIVE to the QUASAR? my attempt: u = u' +v / (1 + u'v/c^2) u = 0.578c RELATIVE to...
  8. J

    Basic relativity question (probably easy for everyone on here xD)

    Homework Statement a quasar is moving away from earth with a speed 0f 0.850c. It emits a proton that eventually reaches earth with a speed of 0.519c relative to the earth. How fast is the proton moving relative to the QUASAR. The Attempt at a Solution u = u' + v / 1 + u'(v) / c^2 u...
  9. J

    Relativistic velocity transformations

    oh okay. so b would be equal to 1 as well because of the postulate. thank you for your help!
  10. J

    Describe Millikan's Oil Drop Experiment!

    How did he determine the mass of an oil drop and the charge of the electron?
  11. J

    Finding mass of a single screw lab! No calculations XD

    0.1 is the sweet spot. It is very similar to the oil drip experiment!
  12. J

    Finding mass of a single screw lab! No calculations XD

    3.5 1.9 0.9 5.4 2.8 -2.1 8.2 0.7 8.9 see what I mean? absolute value algorithm ends with 0.6 0.6 how do i finish it and get the mass? is 0.6 grams the mass?:S
  13. J

    Finding mass of a single screw lab! No calculations XD

    Interesting that you say it reminds you of Millikan's oil drip experiment. How so?
  14. J

    Finding mass of a single screw lab! No calculations XD

    YIIIIIIIIIIP i did it without the negatives and i got 0.9, 0.3, 0.9 .. which equals 0.6, 0.6. BUT if i use negatives for the last step it would be 0.6 - (-0.6) = 1.2 g! is that a good guess? or should i stick with 0.6?
  15. J

    Finding mass of a single screw lab! No calculations XD

    i got -198.8! in the 10th difference haha what... i did it on excel as well, same answer! what am i doing wrong?
  16. J

    Finding mass of a single screw lab! No calculations XD

    Okay I am going to try that now. I will have to do every possible combination of the 5 cups correct? in ascending order? :O
  17. J

    Finding mass of a single screw lab! No calculations XD

    wow i have no idea what you guys are trying to tell me! Example please :blushing:
  18. J

    Finding mass of a single screw lab! No calculations XD

    no teacher said it was a simple calculation! I think i'm overlooking it :(
  19. J

    Finding mass of a single screw lab! No calculations XD

    think this works: (c=mass of cup, v=bottle2-1=mass of screws more in bottle 2 then 1 and w=bottle3-1=mass of screws more in bottle 3 then 1, x is number of screws) 1) cup2 = c + vx 2) cup3 = c + wx so 1) 32.20 = c + 3.5x 2) 37.60 = c + 8.9x 1) c = 32.20 - 3.5x add into 2 2) 37.60 =...
  20. J

    Finding mass of a single screw lab! No calculations XD

    I do not know the number of screws. the masses of the 5 cups are all including the masses of the screws and yes all the cups are of equal mass. cup1: 28.7g cup2: 32.20g cup3: 37.6g cup4: 45.80g cup5: 60.50g
  21. J

    How do i find common factors?

    3.5, 5.4, 8.2, 8.9, 13.6, 14.7, 17.1 22.9, 28.3, 31.8. is there any easier way then by hand :\ thanks for any help
  22. J

    Finding mass of a single screw lab! No calculations XD

    I have been given the masses of 5 cups, each with a different amount of screws inside. I am asked to find the mass of a single screw. The cups themselves are all equal in mass and the screws are all equal in mass as well. I subtracted all the cups from eachother to get a bunch of numbers...
  23. J

    Finding the mass of a screw lab.

    bottle 1 = 28.70g bottle 2 = 32.20g bottle 3 = 37.60g bottle 4 = 45.80g bottle 5 = 60.50g
  24. J

    Finding the mass of a screw lab.

    would all the equations be equal to the same value? say a cup was 26.7 grams, what would the equation be?
  25. J

    Finding the mass of a screw lab.

    I have been given the masses of 5 cups, each with a different amount of screws inside. I am asked to find the mass of a single screw. The cups themselves are all equal in mass and the screws are all equal in mass as well. I know you are supposed to subtract the cups from each other to...
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