Recent content by Trec93

  1. Trec93

    Problem with equation / proving formula

    Yeah I'm probably going to assume that there's a mistake in the book, u is the coefficient of friction, this equation is the given equation of kinetic energy = work where the force is the force of friction.
  2. Trec93

    Problem with equation / proving formula

    Homework Statement I have to prove some formula, I got stuck in the process. Homework Equations Formula to prove: v_{0} = \frac{M+m}{m}\sqrt{2gus} Valid equation that should get me to this formula: \frac{m^2v_{0}^2}{2(M+m)} = gmus The Attempt at a Solution v_{0}^2=\frac{2(M+m)}{m^2}gmus...
  3. Trec93

    Doppler effect Formula manipulation

    Like this? v_{s}=\frac{-f_{s}v}{f}+\frac{vf}{f} Wait I see where this is going.. v_{s}=\frac{-f_{s}v+vf}{f} v_{s}=\frac{v(f-f_{s})}{f} Is this right?
  4. Trec93

    Doppler effect Formula manipulation

    Ok here's how I did it: f=f_{s}\frac{v}{v-v_{s}} I multiplied this by: (v-v_{s}) \Rightarrow f(v-v_{s})=f_{s}v Then I divided by F and subtracted v -v_{s}=\frac{f_{s}v}{f}-v Finally I multiplied by the negative sign, that's my result: v_{s}=\frac{-f_{s}v}{f}+v I know they both are equal...
  5. Trec93

    Doppler effect Formula manipulation

    Homework Statement I have this Doppler effect formula, but I don't know how it was derived, I can't repeat the process myself to solve for speed of the source, I would really appreciate if someone could mathematicly solve this in steps, thank you very much. Homework Equations...
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