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kiera2599
25.01.2020 •
Mathematics
Aparabolic microphone used on the sidelines of a professional football game uses a reflective dish 16 inch wide and 4 inch deep how far from the bottom of the disk should the microphone be placed?
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Ответ:
(4, 8), (4, -8)
For parabola facing right:
y2 = 4ax
Substituting either coordinates to solve for a:
a = 4
Therefore, the microphone should be placed 4 inches from the bottom of the disk.
Ответ:
The microphone should be placed 4 inches far from the bottom of the disk.
Step-by-step explanation:
If we put the parabolic microphone into the coordinate system with the vertex at the origin and facing to the right, then the equation of the parabola would have the form:
Where, a is the distance between focus and vertex.
The microphone to be placed at focus.
The parabolic microphone used on the sidelines of a professional football game uses a reflective dish 16 inch wide and 4 inch deep. It means the parabola passing through the points (4,8) and (4,-8).
Put x=4 and y=8 in equation (1).
Divide both sides by 16.
Therefore, the microphone should be placed 4 inches far from the bottom of the disk.
Ответ:
-8a
or
3a - l^2a
Step-by-step explanation: