Homework Help: Find the displacement from the equilibrium position

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1. Mar 23, 2016

zade70

1. The problem statement, all variables and given/known data
Find the displacement from the equilibrium position of the particle that is in the distance x=£/12 from the wave source, for the moment t=T/4. The amplitude of the wave is A=0.2 m

2. Relevant equations
x=A*cos(wt)=A*cos2*pi/T* t

3. The attempt at a solution
x=£/12
£/12=0.02*cos2*3.14/T *T/4
£=0.02*12=0.24 m. Is this what I should find?

2. Mar 23, 2016

Staff: Mentor

You'll want to start with the full traveling wave equation which accounts for both time and distance from the source (the argument of the trig function for the wave has terms for both time and distance).

3. Mar 23, 2016

zade70

Could you show me that equation. Maybe we haven't learnt it yet.

4. Mar 23, 2016

Staff: Mentor

5. Mar 23, 2016

zade70

No we haven't done any equation with velocity except v= λ/T

6. Mar 23, 2016

Staff: Mentor

That's the velocity that the wave travels from the source, and it is relevant here as part of the traveling wave equation. If you haven't covered it yet you'll have to read ahead in order to answer this question.

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