Recent content by ordirules

  1. O

    Construct an Egg-Safe Structure with Newspaper and Masking Tape

    how about two or three baskets one on top of the other? As soon as it goes through one, it may have slowed down enough to not go through the other? Also, for the physics of it, force is change of momentum over time (impulse). In this case, you want the lowest force possible on the egg and...
  2. O

    Relativity: Solving for Simultaneous Events

    well i was just saying if you put in an arbitrary distances x_1 and x_2, you should get such a formula for the time difference: t2' - t_1' = -\gamma \frac{(x_1-x_2) v}{c^2} When x_1 approaches x_2, the time difference become zero, which makes sense because two events happening at the same point...
  3. O

    Chemistry How Many Moles Are in 80.1g of Phosphorus and Atoms in 4.4 Mol F2?

    First of all, those problems are not related to each other, they're separate questions, I think you're mixing them up and confusing stuff together. Problem 1 is a very simple idea. Remember, the molecular weight is grams/mole. If the molecular weight of Phosphorus is 30.974 grams of Phosphorus...
  4. O

    Chemistry How Many Moles Are in 80.1g of Phosphorus and Atoms in 4.4 Mol F2?

    This is a chemistry question, but anyway, if you look up on your periodic table, there is a number called the "molecular weight". For phosphorus, you should find its molecular weight is 30.974 grams/mol. You should be able to figure out what to do from there. Now, if you remember what a mole...
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    Relativity: Solving for Simultaneous Events

    Sorry, thanks for messaging me again because I completely forgot about your reply! No, for gamma, there is a problem (it is not -1/2 it is to the power of -1/2): \gamma = \sqrt{\frac{1}{1-\frac{v^2}{c^2}}} So if the relative velocity v is 0.8c then gamma should be: \gamma = \sqrt{\frac{1}{1-...
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    Relativity: Solving for Simultaneous Events

    Okay, I see now. So I think you are missing an equation. You would need the lorentz transform for t' as well. Here are the Lorentz transforms for a frame S' moving with relative speed v in the positive x direction: t' = \gamma (t - \frac{v x}{c^2}) x' = \gamma (x - vt) y' = y z' = z How...
  7. O

    Does every subsequence of a_n converge to a?

    Thanks for saying that, but now I'm a little confused... The number seems to approach zero when you go to infinity (although the sum of the sequence clearly doesn't). Why is it said that it does not approach zero? What criterion says so? Sorry for using this post for my question. Is there a...
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    Does every subsequence of a_n converge to a?

    Woops! You're definitely right! Yes, a sequence has to converge to a number. (I was trying to remember what people defined sequences as) Anyway, let me rephrase my last question: If a sequence does eventually converge to a value, what is the relation between the differences of adjacent sequence...
  9. O

    Does every subsequence of a_n converge to a?

    Well, first of all, keep in mind that a sequence keeps order, unlike a set. A set is like a bag you just throw numbers in and a sequence is like a pile where you stack numbers on, stacking it differently makes it a different sequence. Typically, Mathematicians use parentheses() for sequences...
  10. O

    Relativity: Solving for Simultaneous Events

    Just to help a little more, for example, you can set the time the events happened in S to be 0 (or it could be any other number). So, if I choose the events to happen at t = 0 for S, the events coordinates in S are: (50, 0, 0, 0) and (150, 0, 0, 0)
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    Relativity: Solving for Simultaneous Events

    What do you mean by they both start at (0,0,0)? Remember, in relativity, it is not enough to specify the spatial coordinates. You also need to specify a time. i.e. At what point in spacetime do the two frames S and S' coincide? (You can choose any point) From there, at what time coordinate in...
  12. O

    Finding Unknowns in Circuits: Using Loop Rules and Substitution

    I don't know what you did but the assumption that i2 = i3 may not be correct. I would do the loop rules first (the Vb -Va part you wrote) then at the last moment do a substitution i3 = i1 - i2 (assuming the same directions you chose for your current) you should then end up with two...
  13. O

    Finding Unknowns in Circuits: Using Loop Rules and Substitution

    I'm not sure, what have you used to solve the problem? Did you use Kirchoff's loop rules and the junction rule?
  14. O

    Understanding Jackson - calculation of coefficients

    no problem, I am glad to help :-)
  15. O

    Maximum Compression of Spring on Ramp

    When the particle moves from the top to the spring, it loses potential energy. However, when it loses this energy, the energy must go somewhere. In this problem, they want to know the point of highest compression in the spring. What is the change kinetic energy of the mass at this point? What is...
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