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    Sound Intensity and Distance

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    A loudspeaker is placed between 2 observers who are 120m apart, along the line connecting them. If one observer records a sound level of 60.0 dB and the other records a sound level of 90 dB, how far is the speaker from each observer? Hint: use the equation which relates to the difference between the decibel levels to the distance from the source.
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    Answers:
    a) 3.7, 116.3
    b) 4.3, 115.7
    c) 6.2, 113.8
    d) 8.6, 111.4
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    A body oscillates with simple harmonic motion along the x-axis. Its displacement varies with time according to the equation x=5sin(3.14t + 3.14/3). pi=3.14. The velocity (in m/s) of the body at t=1 second is:
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    a) +8
    b) -8
    c) -14
    d) +14
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    OTA: please take this problem only if you can show step by step problem solving and equations used. Also, very important, show why the final answer is a positive or negative sign. Thank you.

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