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anonymous

  • one year ago

If 20 waves of water pass you in 5.0 s and the waves are 2.0 m long, how fast are they moving? 1.0 m/s , 2.0 m/s , 4.0 m/s , or 5.0 m/s ?

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  1. Michele_Laino
    • one year ago
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    is 2.0 meters the wave length ?

  2. anonymous
    • one year ago
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    i think so :)

  3. anonymous
    • one year ago
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    ohh so our solution is 2.0 m/s?

  4. Michele_Laino
    • one year ago
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    I'm pondering...

  5. anonymous
    • one year ago
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    ok!

  6. Michele_Laino
    • one year ago
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    if 20 waves pass in 5 seconds, the one wave pass in 5/20=0.25 seconds

  7. Michele_Laino
    • one year ago
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    so I see one wave length every 0.25 seconds, and the requested speed is: 2/0.25=8

  8. Michele_Laino
    • one year ago
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    what is wrong in my reasoning?

  9. anonymous
    • one year ago
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    ohh okay! ermm i am not sure... :/ the solution is 8 though right? :/

  10. anonymous
    • one year ago
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    i am not sure why that is not a choice? :/

  11. anonymous
    • one year ago
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    because your reasoning makes sense :/

  12. Michele_Laino
    • one year ago
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    yes!

  13. anonymous
    • one year ago
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    okay! thank you!! :)

  14. Michele_Laino
    • one year ago
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    I'm sorry!

  15. anonymous
    • one year ago
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    haha it is okay! thank you:)

  16. Michele_Laino
    • one year ago
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    please try to ask to another tutor

  17. anonymous
    • one year ago
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    okie:)

  18. anonymous
    • one year ago
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    thankyou!!

  19. Michele_Laino
    • one year ago
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    please wait I call for another tutor

  20. anonymous
    • one year ago
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    okie! :)

  21. Michele_Laino
    • one year ago
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    @Australopithecus please help!

  22. Michele_Laino
    • one year ago
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    @Hero please help

  23. Michele_Laino
    • one year ago
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    @amistre64 please help

  24. Michele_Laino
    • one year ago
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    @sammixboo please help

  25. Michele_Laino
    • one year ago
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    @Jaynator495 please help

  26. Michele_Laino
    • one year ago
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    @Nnesha @ParthKohli please help

  27. ParthKohli
    • one year ago
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    \[v = f \times \lambda\]

  28. ParthKohli
    • one year ago
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    v - velocity of the wave. f - frequency of the wave (number of waves passing in 1 second). \(\lambda\) - wavelength, or length of a wave.

  29. anonymous
    • one year ago
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    so f=20/5 = 4 waves per second? and wavelength is 2.0 m ?

  30. ParthKohli
    • one year ago
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    That is correct. The answer is thus \(4 ~s^{-1} \times 2 ~m = 8 ~ms^{-1}\).

  31. anonymous
    • one year ago
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    ooh okay! hmm i am not sure then :/ i was not given that choice :( i think maybe a typo? haha :P but yes, thank you both very much!!:)

  32. Michele_Laino
    • one year ago
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    thanks! @ParthKohli

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