- #1

- 555

- 19

I don't understand why I keep getting a negative result...

## Homework Statement

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

## Homework Equations

## 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...

Thanks,

BOAS