What Is the Phase Constant of the Wave?

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The discussion revolves around determining the amplitude and phase constant of a wave based on a provided diagram. The amplitude is related to the vertical axis measurement of 8 cm, while the horizontal axis indicates a time period of 3 seconds. Participants suggest using the wave equations x(t) = A sin(ωt + φ) or x(t) = A cos(ωt + φ) to find the phase constant. There is a need for clarification on which equation to use based on the context of the problem. The conversation highlights the importance of accessible diagrams for solving such wave-related questions.
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Homework Statement


If the vertical axis blocks are 8 cm each and the horizontal axis blocks are 3 s each, what is the amplitude (in cm) of the wave shown in the diagram

http://i54.tinypic.com/2ilngr9.gif

What is the phase constant (in degrees) of the oscillation in the diagram?

Homework Equations


Ø = wt + Ø0

The Attempt at a Solution


I have nooooo idea where to start

I got that w is 0.35, but I don't know about Ø or Ø0
 
Last edited:
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I have nooooo idea where to start
Perhaps you could start by posting a diagram that is accessible and is not at a site that needs your userID and password.
 
kuruman said:
Perhaps you could start by posting a diagram that is accessible and is not at a site that needs your userID and password.

Sorry! I didn't realize it required a password

2ilngr9.gif
 
Excellent. The phase is the argument of a sine or cosine. You could write the expression that you are seeking in two ways,

1. x(t) = A sin(ωt+φ)
2. x(t) = A cos(ωt+φ)

Which of the two do you think the question wants you to use? You could use either one, each expression will have the same A and ω, but different φ. So if you are required to give an answer to a computer program, you have to know which expression it expects.
 

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