The reflective property of an ellipse is the principle behind "whispering galleries." These are rooms with elliptically shaped ceilings such that a person standing at one focus can hear even the slightest whisper spoken by another person standing at the other focus. Suppose that a dome has a semielliptical ceiling, 96 ft long and 23 ft high. Choose a coordinate system so that the center of the semiellipse is 0 , 0 with vertices − 48 , 0 and 48 , 0 and with the top of the ceiling at 0 , 23 . Approximately how far from the center along the major axis should each person be standing to hear the "whispering" effect? Round to 1 decimal place.
The reflective property of an ellipse is the principle behind "whispering galleries." These are rooms with elliptically shaped ceilings such that a person standing at one focus can hear even the slightest whisper spoken by another person standing at the other focus. Suppose that a dome has a semielliptical ceiling, 96 ft long and 23 ft high. Choose a coordinate system so that the center of the semiellipse is 0 , 0 with vertices − 48 , 0 and 48 , 0 and with the top of the ceiling at 0 , 23 . Approximately how far from the center along the major axis should each person be standing to hear the "whispering" effect? Round to 1 decimal place.
Solution Summary: The author explains how to determine the distance between the center and the major axis such that two people standing at either side can hear the whispering sound.
The reflective property of an ellipse is the principle behind "whispering galleries." These are rooms with elliptically shaped ceilings such that a person standing at one focus can hear even the slightest whisper spoken by another person standing at the other focus.
Suppose that a dome has a semielliptical ceiling,
96
ft
long and
23
ft
high. Choose a coordinate system so that the center of the semiellipse is
0
,
0
with vertices
−
48
,
0
and
48
,
0
and with the top of the ceiling at
0
,
23
.
Approximately how far from the center along the major axis should each person be standing to hear the "whispering" effect? Round to
1
decimal place.
System that uses coordinates to uniquely determine the position of points. The most common coordinate system is the Cartesian system, where points are given by distance along a horizontal x-axis and vertical y-axis from the origin. A polar coordinate system locates a point by its direction relative to a reference direction and its distance from a given point. In three dimensions, it leads to cylindrical and spherical coordinates.
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