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  1. J

    Newton's third law of motion - help me to explain it to someone

    Newton's third law of motion is specifically describing forces. If I am at rest and a particle hits me with a force, \mathbf{\vec{F}}, then it feels a force exerted by me equal to -\mathbf{\vec{F}}.
  2. J

    Doppler effect of light

    Ah yes there is a typo--for approaching the signs should be reversed \nu_O=\nu_S\sqrt{\frac{1+v/c}{1-v/c}}
  3. J

    Doppler effect of light

    glad to help.
  4. J

    Doppler effect of light

    If you are approaching a light source, then you can compute the shift in frequency of light by \nu_O=\nu_S\sqrt{\frac{1-v/c}{1+v/c}} where \nu_O is the frequency seen by the observer, \nu_S is the frequency emitted by the source of the light, c is the speed of light, and v is the speed...
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