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physics

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An earthquake generates three kinds of waves: surface waves (L waves), which are the slowest and weakest; shear (S) waves, which are transverse waves and carry most of the energy; and pressure (P) waves, which are longitudinal waves and travel the fastest. The speed of P waves is approximately 7.0 km/s, and that of S waves is about 4.0 km/s. Animals seem to feel the P waves. If a dog senses the arrival of P waves and starts barking 39.5 s before an earthquake is felt by humans, approximately how far is the dog from the earthquake’s epicenter? pleaaseeee !!! ('drwls' 369 miles is wrong answer :( ! can you calculate with meter pleasee )

  • physics - ,

    http://www.jiskha.com/display.cgi?id=1319462909

  • physics - ,

    bobpursley 369 km is true!! thnx very much ! But if starts barking is 23.3 s ?? what is answer ?? can you calculate please !

  • physics - ,

    i found it ! thankssss

  • physics - ,

    A sinusoidal wave on a string is described by the equation y = (0.169 m) sin (0.713 x - 41.9 t), where x and y are in meters and t is in seconds. If the linear mass density of the string is 10.1 g/m ...
    a) ... the phase of the wave at x = 2.27 cm and t = 0.175 s. ?
    b)... the speed of the wave ?
    c)... the wavelength.
    d) ... the power transmitted by the wave. ?

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