Recent content by tomceka

  1. tomceka

    How does the accuracy of the clock change when the spring stretches?

    A longer pendulum swings slower. So changing the length l of the pendulum changes the period T, which affects the timekeeping accuracy. But the problem is talking about the body on the spring, not the string. So the second formula cannot be applied here directly and I don't know how to progress...
  2. tomceka

    Geometrical optics: using Snell's law, find the depth of the pool

    Thank you.
  3. tomceka

    Geometrical optics: using Snell's law, find the depth of the pool

    Do you mind explaining what do you mean by that? Is there something wrong with my diagram?
  4. tomceka

    Geometrical optics: using Snell's law, find the depth of the pool

    My bad, it should be θ+γ. Although the answer is still wrong. Is there something I missed?
  5. tomceka

    Geometrical optics: using Snell's law, find the depth of the pool

    α=30°; l=0.5 m; n1=1; n2=1.33 α+β=90°, so β=90°-30°=60°. Using Snell's law: sinβ/sinγ = n2/n1 sinγ≈0.651 γ≈41°. β=γ+θ (vertical angles) θ=60°-41°=19° tan(θ+β)=l/h h=l/tan(θ+γ) h=0.5/(tan(19+41))≈0.289 m
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