00:02
So, if you draw that figure on itself, you have somewhat figure like that.
00:10
Remember, we're looking at b to a.
00:13
I'm going to solve the first question.
00:16
And we're making an angle of theta there, which means that this is what we're looking at.
00:28
And this is 1 .2 meters.
00:31
And of course, we're making another theta there.
00:37
And this is point d here, which means this will be point c and point e there.
00:56
So these distances are given.
00:58
We have 0 .75 meters.
01:03
Of course, also this is 0 .75 meters.
01:06
This is 1 .6 meters, which means that this distance ae will be equal to 0 .6 meters.
01:16
It is half of that ba, which means that from the diagram, sine of theta will be equal to 1 .6 minus 0 .75 divided by 1 .2, which means theta is therefore around 45 .1 degrees.
01:34
From there, now we need to proceed and calculate the hydrostatic force and of course, the depth of the center of pressure.
01:43
So hydrostatic force, i'll call that f will be equal to density gravity multiplied by a multiplied by yc.
01:51
That is, of course, density is given.
01:54
So we're looking at 800 multiplied by gravity, 9 .81 multiplied by the area.
02:02
We're looking at 0 .6 multiplied by 1 .2 because it's a rectangle...