00:01
So in this question, we have a stretched string.
00:03
The stretched string has a match per unit length of 5 grams per centimeter.
00:14
And then it has tension of 10 .0 .0.
00:19
So you see it away and then travels on it.
00:22
And that has an amplitude of ym equals 0 .0 millimeter.
00:31
And we have a frequency of 100 hertz.
00:34
And then it's traveling in the negative direction of the x -axis.
00:40
So if we write out the formula, we will know that it was m sine of kx.
00:50
So question says plus or minus omega -t, but we know it's traveling in the negative direction, so it has to be plus omega -t.
00:59
So let's first look at part a.
01:01
What is amplitude? we're told it's 0 .12 millimeter.
01:05
What is b? what is k? in order to find k, we need to find out what is k is 2 pi over lambda.
01:16
We need to find out what lambda is.
01:19
In order to find out lambda, we need to figure out, well, lambda is v over frequency.
01:29
We need to figure out what v is...