- #1

cosmogirl90

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## Homework Statement

y' = (0.80 cm) sin[(π/3 cm-1)x] cos[(45π s-1)t]

(a) What are the amplitude and speed of the two waves (identical except for direction of travel) whose superposition gives this oscillation?

(b) What is the distance between nodes?

(c) What is the speed of a particle of the string at the position x = 1.5 cm when t = 9/8 s?

## Homework Equations

(a)y1=(.8cm)sin[(π/3 cm-1)x + (45π s-1)t]

y2=(.8cm)sin[(π/3 cm-1)x - (45π s-1)t]

y(x,t)=A*sin(kx-omega*t)

where A is ampltude, k is wave number, omega is frequency

(b)lambda=2π/k

## The Attempt at a Solution

When I answered that my amplitude was .8cm, that was wrong. so I'm confused about whether I'm using the wrong interpretation of the oscillating string's equation. Also, when I used the equation in (b) I got the wrong wavelength. I think the problem is that I'm not understanding what each of the numbers in the original equation correspond to.