00:01
All right, so let's say we have a pipe that has an expanding diameter.
00:04
We're told the radius at point a is 1 .5 centimeters.
00:12
And then at point b, the radius is 3 centimeters.
00:18
And the absolute pressure at point, let's see, absolute pressure at point b, we're told is 1 .5, or we'll write as 100.
00:32
50 ,000 pascal's.
00:35
So part a, another thing we're told is the volume flow rate is at, or see, it's two times 10 to the negative third.
00:47
Let's look at it.
00:48
Yeah, two times 10 to the negative third cubic meters per second.
00:52
And so we want to know what is the speed of the water at point b.
00:57
And let me use a different symbol here.
00:59
Let's just use i don't know letter beta for a volume flow rate so our velocity at point b is going to be the volume flow rate divided by the area at point b so 2 10 to the negative 3rd cubic meters per second divided by pi times 0 .03 meters squared and so this should come out to 0 .707 meters per second and then at part b we want to know what's the the speed at point a.
01:44
So here we can either calculate it exactly the same way we did with b, but we can also use the fact that this should be the area at region b times velocity b divided by the area at region a...