00:01
All right, so let's say we have a wire made of steel that has a length of 30 meters, and it's connected to a wire made of copper that has a length of 20 meters.
00:10
And they each have a tension of 150 newtons in them.
00:14
And they have equivalent diameters of one millimeter.
00:19
So the density of steel will write as 7 ,850 kilograms per cubic meter, which means our like sort of linear mass density for the steel wire.
00:33
Is going to be basically the density of steel times pi d squared over four.
00:43
So we have 10 to the negative third squared times pi divided four times 7 850.
00:50
This is 6 .17 times 10 to the negative third kilograms per meter.
00:57
And then if we do a similar calculation for copper, given that the density of copper, is let's see about 8 ,960 kilograms per cubic meter.
01:24
So what we'll have is, let's see, 785, 8, 960.
01:35
So there we go, sorry, 7 .037 times 10 to the negative third kilograms per cubic meter...