00:01
First we need to find the pressure at point b when the siphon action ceases.
00:05
Since the absolute pressure at b is 1 .8 m of water and the barometric pressure is 10 .3 m of water, the pressure at b relative to the atmosphere is 10 .3 -1 .8 which is equal to 8 .5 m of water.
00:26
Now let's find the height difference between the points a and b.
00:30
Since a is 150 mm which is equal to 0 .15 m above the base of the tank and b is 9 m above a, the height difference is equal to 9 plus 0 .15 which is equal to 9 .15 m.
01:00
Using the pressure at b and the height difference between a and b, we can find the depth of the water in the tank when the siphon action ceases.
01:08
The pressure at b is equal to the height of the water column above b.
01:13
So the depth of water in the tank is equal to 8 .5 m plus 9 .15 m which is equal to 17 .65 m.
01:32
Next we need to find the total head loss in the pipe due to friction.
01:38
The head loss per meter is given by 0 .5 v square divided by 2g where v is the velocity in the pipe and g is the acceleration due to gravity...