Recent content by jigsaw21

  1. J

    Work done on an Object - Pulling a wagon while lifting up at an angle

    Juri is tugging her wagon behind her on the way to... wherever her wagon needs to go. The wagon repair shop. She has a trek ahead of her--five kilometers--and she's pulling with a force of 200 Newtons. If she's pulling at an angle of 35 degrees to the horizontal, what work will be exerted on the...
  2. J

    How to derive the de Broglie Relation

    Correct me if I'm wrong, but What I've gathered is the general form of the wave equation is given as ψ = e^i(kx - ωt). And since this represents a wave, I related it to my past history of mathematics with sin and cos graphs when there were transformations, in the form of for example: y =...
  3. J

    How to derive the de Broglie Relation

    I see that now, thanks! I guess I don't even need the Energy equations at all to derive that k = p / ħ I then guess one of my other curiosities was what is k = 2π/λ derived from, and how does it relate to the topic of Schrodinger's Equation and Wave Functions? Because that's the topic...
  4. J

    How to derive the de Broglie Relation

    I began by taking E = mc^2 and E = hf , where h is Planck's constant, and then rewrote E as 1/2mv^2. I rewrote f as c / λ, which made hf become h*c / λ. I then set this expression equal to the Kinetic Energy equation 1/2mv^2, which gave me: 1/2mv^2 = h*c / λ I then replaced c on the...
  5. J

    Finding Ctr of Mass of object w/ given uniform mass density

    I appreciate your reply. I think I follow this. I understand it in plain English as you explained it. But to translate that to mathematical equivalents such as 2M/3L and 4M/3L is the part that I'm struggling with.
  6. J

    Finding Ctr of Mass of object w/ given uniform mass density

    To answer your question, yes. I/m definitely unfamiliar with mass density. The class I'm taking is an archived Physics course with Calculus. I'm very well versed on Calculus and everything math related. But I always struggled with Physics. I passed it back when I took a Physics w/...
  7. J

    Finding Ctr of Mass of object w/ given uniform mass density

    Well the wording of the problem had me confused. The λ1 "along the left half" sounds to me that you'd cut the stick in half. And the left piece would have the λ1 spot wherever 2M/3L would be calculated. And the same for the right half piece and 4M/3L. Is that the correct way to look...
  8. J

    Finding recoil velocity of an object during a collision

    I didn't even think to try going backwards and checking, but thanks for that! I also didn't think to simplify the mass to be 16m
  9. J

    Finding recoil velocity of an object during a collision

    Can anyone else tell me if I'm on the right track with this question, or if I'm not?
  10. J

    Finding Ctr of Mass of object w/ given uniform mass density

    Homework Statement Find the Center of Mass locations of a thin stick of mass M and length L, whose left ends are at x=0. The stick has uniform mass density λ1 = 2M/3L along the left half, and has uniform mass density λ2 = 4M/3L along the right half. Homework Equations I know that this is...
  11. J

    Finding recoil velocity of an object during a collision

    In this course, we haven't gotten to relativistic calculations at all yet. The topic we're on is conservation of momentum, impulse, force and center of mass.
  12. J

    Finding recoil velocity of an object during a collision

    Yes, sorry about that. That should've been proton!
  13. J

    Finding recoil velocity of an object during a collision

    Hello. I recently began this problem, but the site I'm working this problem on isn't showing me whether the answer is correct or not. Can someone please check my work and just verify that it's correct or state if it isn't and why? 1. Homework Statement A cosmic-ray photon (with mass m...
  14. J

    Finding the POSITION of the center of mass

    omg... I feel so dumb sometimes. The (halfway) I see now meant HALFWAY BETWEEN 0L and 3L in the y-direction which is 1.5L. Which I now see is equivalent to 9mL /6m. The wording of these things always gets me confused. Thanks for helping to clear this up for me.
  15. J

    Finding the POSITION of the center of mass

    Homework Statement Three spheres are placed around a coordinate grid: one of mass m at the bottom-left, one of mass 3m a distance of 3L above the first, and one of mass 2m a distance of 4L to the right of the first. 4 points between these three spheres are labeled: A near (1.3L, 1.5L), B...
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