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OpenStudy (anonymous):
the reflecting dish of a parabolic microphone has a cross-section in the shape of a parabola.the microphone itself is placed on the focus of the parabola.if the parabola is 40 inches wide and 20 inches deep,how far from the vertex should the microphone be placed?
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OpenStudy (anonymous):
left me hanging @ranga
OpenStudy (jdoe0001):
|dw:1382649561387:dw|
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