Displacement of a wave


I don’t understand why I keep getting a negative result…

1. The problem statement, all variables and given/known data

The displacement (in metres) of a wave is given according to

y = 0.26 sin(πt − 3.7πx),

where t is in seconds and x is in metres,

What is the displacement y when t = 38 [s] and x = 13 [m] ?

2. Relevant equations

3. The attempt at a solution

The wave travels in the +x direction because as time increases so does the displacement, so i’m expecting a +ve result.

[itex]y = 0.26 \sin (\pi 38 – 3.7 \pi 13)[/itex]

This keeps giving me [itex] y = -0.1367[/itex] as an answer which surely can’t be correct.

I don’t know what i’m doing wrong…




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