Recent content by Tallus Bryne

  1. Tallus Bryne

    Tricky Integration

    Agreed. Thanks for clearing that up.
  2. Tallus Bryne

    Tricky Integration

    I like the simplicity, but shouldn't it be just half of ##(f^2)## ? edited: forgot the "half of"
  3. Tallus Bryne

    Tricky Integration

    There is an easier way. Try a simple "u-substitution".
  4. Tallus Bryne

    Studying Where can i find more problems like this?

    Is this from an engineering course or something? I see on the lower left hand corner there in the photo it says "Dynamics 3". Not sure what that means. This looks to me like something out of a machine design class I'm currently taking. There's a whole chapter on balancing with problems that look...
  5. Tallus Bryne

    Conservation of Energy Homework problem

    This is fine if you treat Δh as a positive number (this would work with a coordinate system with the downward direction being positive). Perhaps I'm being a little too pedantic about consistency with signs and coordinate systems. The most important thing is that your result for work is positive...
  6. Tallus Bryne

    Conservation of Energy Homework problem

    We're dealing with gravity, but the following approach is supposed to work with any force that can be considered conservative (means that work done by that force is path independent). You derive an expression for the work done by that force over some specified path, which begins at point A and...
  7. Tallus Bryne

    Conservation of Energy Homework problem

    If you consider the positive direction for the motion to be "up", and the ball is falling "down", then the work could be expressed as -mgΔh as long as we consider the Δh to be negative due to the choice of orientation for our coordinate system. However, like what LemmeThink said, you don't...
  8. Tallus Bryne

    Conservation of Energy Homework problem

    It's worth pointing out two things about your approach so far: Do you see that your ΔKE expression implies an initial state of rest (if what you mean by v is vf) ? You did not state that as an assumption, so you might want to make sure that it's an assumption worth making. Either the PE...
  9. Tallus Bryne

    How do you find acceleration using Hooke's law?

    Your results look fine to me. Remember that it doesn't matter if an object starts out with 0 m/s or 1000000 m/s; any given instantaneous acceleration a = (net F)/m will only tell you how the velocity changes with that time at that instant.
  10. Tallus Bryne

    Coplanar force systems

    No problem. Just one last thing. Not sure if your edit on your post for the value of W worked. Just to clarify it should be 175 N. Although I will assume that you must have gotten that result if you calculated 17.8 kg as the mass.
  11. Tallus Bryne

    Coplanar force systems

    Also, as a quick alternative to going through all the math: Examine each FBD carefully. Assuming static equilibrium of the ring at point D, it can be said that F(DE) must be larger in magnitude than F(CD) since only one component of F(DE) balances the force F(CD). A slightly more careful...
  12. Tallus Bryne

    Coplanar force systems

    Alright, so substitute in for F(AC) in this equation. Use this to write F(BC) in terms of W. Afterwards you can then write F(AC) in terms of W. You will then have expressions for all the forces of tension in the ropes in terms of W. Comparing all of these you should be able to determine which...
  13. Tallus Bryne

    Coplanar force systems

    This is incorrect. Check your FBD and make sure you're writing out your equation with the correct subscripts.
  14. Tallus Bryne

    Teaching myself math in jail?

    I've always wished that I had more time to read up on things that I'm interested in, but I wouldn't go so far as possibly insulting the OP by equating their situation with this "fantasy". Please correct me if I'm wrong, but would you "trade places" with them? You could catch up on all that...
  15. Tallus Bryne

    A charged particle entering a magnetic field at an angle -- is work done?

    Think of a simple case of centripetal motion at some constant potential energy state (perhaps a "car" going around a circular, horizontal track at constant speed). The centripetal force is responsible for the change in motion, but that doesn't mean the energy changes (constant speed means...
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