Advanced Mathematical Concepts: Precalculus with Applications, Student Edition
Advanced Mathematical Concepts: Precalculus with Applications, Student Edition
1st Edition
ISBN: 9780078682278
Author: McGraw-Hill, Berchie Holliday
Publisher: Glencoe/McGraw-Hill
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Chapter 10.4, Problem 46E
To determine

To write: The equation of the hyperbola on which the lightning strike was located, if sound travels at 1100 feet per second.

Expert Solution & Answer
Check Mark

Answer to Problem 46E

  x2(1100)2y2(5340.55)2=1

Explanation of Solution

Given information: Forestry: Two ranger stations located 4 miles apart observe a lightning strike. A ranger at station A reports hearing the sound of thunder 2 seconds prior to a ranger at station B . place the two ranger stations on the x -axis with the midpoint between the two stations at the origin. The transverse axis is horizontal.

  Advanced Mathematical Concepts: Precalculus with Applications, Student Edition, Chapter 10.4, Problem 46E , additional homework tip  1

Calculation:

  Advanced Mathematical Concepts: Precalculus with Applications, Student Edition, Chapter 10.4, Problem 46E , additional homework tip  2

By the definition of the hyperbola we know the difference of the distances between the towers and the lightning strike = the distance between the vertices (2a) .

The difference was 2 seconds between the towers.

Since sound travels at 1100 feet/sec. The difference would be 2200 feet.

Since we’re centered at the origin, this makes

  a=1100.

We know the distance between the foci is 4 miles.

5280 feet = 1 mile means 21.120 feet.

This means c = 10,560 feet.

If a2+b2=c2b2=(10560)2(9110)2b=5340.55

Therefore equation is:

  x2(1100)2y2(5340.55)2=1

Chapter 10 Solutions

Advanced Mathematical Concepts: Precalculus with Applications, Student Edition

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