How Do Taylor Series Help Solve Water Wave Velocity Problems?

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SUMMARY

The discussion focuses on solving water wave velocity problems using Taylor series, specifically addressing the equation v² = gL/(2π)·tanh(2πd/L). For deep water, it is established that v² approximates to (gL/2π)¹/², while for shallow water, the Maclaurin series for tanh is utilized to show that v approximates to (gd)¹/². Participants emphasize the importance of defining "deep" and "shallow" in relation to the variables involved, guiding the selection of the appropriate series expansion.

PREREQUISITES
  • Understanding of Taylor series and Maclaurin series expansions
  • Familiarity with hyperbolic functions, specifically tanh(x)
  • Knowledge of wave mechanics and the relationship between wave velocity, length, and depth
  • Basic calculus skills for manipulating equations and series
NEXT STEPS
  • Study the Taylor series and Maclaurin series in detail
  • Research hyperbolic functions and their properties, focusing on tanh(x)
  • Explore wave mechanics principles, particularly the effects of depth on wave velocity
  • Practice solving similar problems involving wave equations and series expansions
USEFUL FOR

Students studying calculus and physics, particularly those focusing on wave mechanics and mathematical modeling of physical phenomena.

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Homework Statement


A water wave has length L moves with velocity V across body of water with depth d, then v^2=gL/2pi•tanh(2pi•d/L)
A) if water is deep, show that v^2~(gL/2pi)^1/2
B) if shallow use maclairin series for tanh to show v~(gd)^1/2

Homework Equations



Up above

3. The Attempt at a Solution

Have no idea where to start, just looking for some tips and I'm assuming I need the tanh series for both parts, this has been the hardest calculus for me
 
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Well, first things first: define "deep" and "shallow". In each case it means that one of your variables is much less, or much greater, than another. Figure out which quantity is less/more than which other one in each case, and that should tell you what variable or combination of variables to use for your series expansion.

Also, you can look up the series expansion for tanh(x) on Wikipedia, among other places.
 

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