Recent content by OnlinePhysicsTutor

  1. OnlinePhysicsTutor

    Resultant amplitude of 6 phasors

    Homework Statement This is a problem from one of my students, he is taking an undergrad module in optics. Most of the question is fine but I cannot see a neat solution to part ii Homework Equations These are the equations for the topic, but I am not sure if we are missing the relevant...
  2. OnlinePhysicsTutor

    Solving 2 - log₁₀(3x) = log₁₀(x/12)

    I'm happy with that as well, thanks.
  3. OnlinePhysicsTutor

    Solving 2 - log₁₀(3x) = log₁₀(x/12)

    I assume it is meant to be base 10, so I have edited post to include the base.
  4. OnlinePhysicsTutor

    Solving 2 - log₁₀(3x) = log₁₀(x/12)

    Homework Statement 2 - log10 3x = log10(x/12) Homework Equations logab=b log a log(a/b)= log a - log b The Attempt at a Solution 2 + log10 12= log10 x - x log10 3 Start seems simple but cannot see where to go from here, taking exponentials doesn't seem to help. Not sure what the next steps...
  5. OnlinePhysicsTutor

    Tension in rod AB using principle of moments

    I get it now, thank you. I did moments on AB, gives a lateral force of 210N, which then works out to give the answer in the book.
  6. OnlinePhysicsTutor

    Tension in rod AB using principle of moments

    edit; I assume the book answer is taking into account some lateral force also on AB, but I don't see how I would calculate that.
  7. OnlinePhysicsTutor

    Tension in rod AB using principle of moments

    Homework Statement Please see attached picture Homework Equations principal of moments The Attempt at a Solution part a) is fine. For part b, I would Normally take moments about C. The force acting on BC at B must be the tension in AB. The geometry of the triangle gives and angle of 53.1 to...
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