Calculating Wave Speed: Pier Fishing Observation

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Homework Help Overview

The problem involves calculating the speed of a wave based on observations made while fishing from a pier. The original poster notes the timing of wave crests and the distance between them, leading to questions about the application of wave speed formulas.

Discussion Character

  • Exploratory, Assumption checking

Approaches and Questions Raised

  • The original poster attempts to calculate the wave speed using the period and frequency derived from the timing of the crests. Some participants suggest using the wavelength and frequency relationship, while others question the interpretation of the timing in relation to the wave crests.

Discussion Status

Participants are exploring different interpretations of the problem and the calculations involved. There is an acknowledgment of the need to carefully read the problem statement, indicating a productive direction in clarifying assumptions.

Contextual Notes

The discussion highlights the importance of understanding the timing of the wave crests, as the original poster's calculations are based on the timing starting with the first crest and ending with the fourth crest.

JJones_86
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Homework Statement


A person fishing from a pier observes that four crests pass by in 7.35 s and estimates the distance between two successive crests as 7 m. The timing starts with first crest and ends with fourth crest. What is the speed of the wave?


Homework Equations


f = 1/T
v = f*d

The Attempt at a Solution


T = 7.35s/4 = 1.8375
F = 1/T = 1/1.8375 = .544218
V = .544218 * 7m = 3.81

Can someone tell me what I'm doing wrong? Thanks!
 
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try using v=λ*f
 
Thats what i did...
V = .544218 * 7m

isnt λ = .544218?
 
oh right, well i got v=2.86 m/s
 
The problem states the timing starts with the first and ends with the fourth wave.
 
yeah precisely. you have to read the question carefully.
 

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