Concept explainers
(a)
To write: An equation modeling the shape of the room. Assume that is centered at the origin and the major axis is horizontal.
(a)
Answer to Problem 49E
Explanation of Solution
Given information: History: A whispering gallery is designed using an elliptical ceiling. It operates on the principle that sound projected from one focus of an ellipse reflects off the ceiling and back to the other focus. The United States Capitol contains such an elliptical room. The room is 96 feet in length, 46 feet in width and has a ceiling that is about 23 feet high.
Calculation:
Take ½ of each measurement for ( a and b ) and then squared.
(b)
To describe: Two possible places where Adams might have stood to overhear, as John Quincy Adams is known to have overheard conversations being held at the opposite party leader’s desk by standing in a certain spot in this room.
(b)
Explanation of Solution
Given information: History: A whispering gallery is designed using an elliptical ceiling. It operates on the principle that sound projected from one focus of an ellipse reflects off the ceiling and back to the other focus. The United States Capitol contains such an elliptical room. The room is 96 feet in length, 46 feet in width and has a ceiling that is about 23 feet high.
Calculation:
He could stand at either foci, with the desk at the other foci.
(c)
To find: The distance did Adams stand from the desk.
(c)
Answer to Problem 49E
84.26 feet
Explanation of Solution
Given information: History: A whispering gallery is designed using an elliptical ceiling. It operates on the principle that sound projected from one focus of an ellipse reflects off the ceiling and back to the other focus. The United States Capitol contains such an elliptical room. The room is 96 feet in length, 46 feet in width and has a ceiling that is about 23 feet high.
Calculation:
Since the foci are:
Adams will be at one the same distance from the room’s center as the desk so,
Chapter 10 Solutions
Advanced Mathematical Concepts: Precalculus with Applications, Student Edition
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