20. A lifeguard can run on sand at speed vị and swim at speed v2 and will take path AOB as shown below to minimize the time to rescue a swimmer at point B. Let COD = L, find the distance x where the water is entered and sin 81 sin 82 This result is called Snell's Law of optics and is an example of a very deep principle in physics known as Fermat's principle of least time. Much of your future theoretical upper division and graduate work will involve use that value to prove that %3D Za applications of this idea.
20. A lifeguard can run on sand at speed vị and swim at speed v2 and will take path AOB as shown below to minimize the time to rescue a swimmer at point B. Let COD = L, find the distance x where the water is entered and sin 81 sin 82 This result is called Snell's Law of optics and is an example of a very deep principle in physics known as Fermat's principle of least time. Much of your future theoretical upper division and graduate work will involve use that value to prove that %3D Za applications of this idea.
College Physics
11th Edition
ISBN:9781305952300
Author:Raymond A. Serway, Chris Vuille
Publisher:Raymond A. Serway, Chris Vuille
Chapter1: Units, Trigonometry. And Vectors
Section: Chapter Questions
Problem 1CQ: Estimate the order of magnitude of the length, in meters, of each of the following; (a) a mouse, (b)...
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Transcribed Image Text:20. A lifeguard can run on sand at speed vi and
swim at speed v2 and will take path AOB as
shown below to minimize the time to rescue
a swimmer at point B. Let COD = L, find
%3D
the distance x where the water is entered and
V1 sin 8,
sin 82
This result is called Snell's Law of optics
and is an example of a very deep principle in
physics known as Fermat's principle of least
time. Much of your future theoretical upper
division and graduate work will involve
use that value to prove
that
%3D
Za
applications of this idea.
A Sand speed = v
0o L-x
82
Ocean speed = v2
Lz
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