Calculating Wave Speed: Pier Fishing Observation

AI Thread Summary
The discussion revolves around calculating wave speed based on observations from pier fishing. The individual notes that four wave crests pass in 7.35 seconds, with a distance of 7 meters between successive crests. They initially calculate the period (T) and frequency (f) but struggle with the correct application of the wave speed formula. A correction is suggested, emphasizing the need to use the wavelength (λ) in the calculation. Ultimately, the correct wave speed is determined to be 2.86 m/s after clarifying the timing of the observed crests.
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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