Calculating Water Volume in a Tank Using Pressure Measurements

[Nidum]

even if I change L with 8.62 and h changes to roughly 5.75 I still get 2 when I calculate the Pressures in the way stated in post #46

That is correct . The pressure on the base is twice the average pressure on the side .

Anyway you don't need to work that out except possibly for your own interest . You just need to work out the volume of the water .

 

[Regla]

That is correct . The pressure on the base is twice the average pressure on the side .

Anyway you don't need to work that out except possibly for your own interest . You just need to work out the volume of the water .

ohhhhhhh, so that's AVERAGE pressure, makes some sense. But is there any way to make sure that h is actually 5.75?

 

[Nidum]

Work out the actual areas and pressures and pressure forces . If pressure force on the bottom is three times pressure force on the side then you have the right answer for h .

To complete this problem finally what is the actual volume of the water ?

 

[Regla]

Work out the actual areas and pressures and pressure forces . If pressure force on the bottom is three times pressure force on the side then you have the right answer for h .

To complete this problem finally what is the actual volume of the water ?

if the height of the water is 5.75 the the volume is 427 cm³ and the weight is 0.427kg. I also have to convert the weight into kilomoles, but I think I can handle it. thanks. If I'll have any problems while going over the whole solution I'll ask here, is that ok?

 

[Nidum]

That's the correct answer for the water volume - good result .

Certainly ok to ask new questions anytime .

 

[Regla]

That's the correct answer for the water volume - good result .

Certainly ok to ask new questions anytime .

since you're an regular visitor to this forum, what do I do that his post or problem would be shown as solved?

 

[Regla]

That's the correct answer for the water volume - good result .

Certainly ok to ask new questions anytime .

you made a small mistake (as did I) L is 40cm, 64dm³ is not 640cm³ it's 64000cm³. It's because we're dealing with volume not length.

 

[Nidum]

We are told that the total volume of the cube is 640 cm³ . If that's the volume then length of side is 8.62 cm . I don't know where you get all the other numbers from ?

 

[haruspex]

64dm3 is not 640cm3

In post #1 you wrote 640cm³. Are you now saying that was wrong, that it is 64dm³?

 

[Regla]

In post #1 you wrote 640cm³. Are you now saying that was wrong, that it is 64dm³?

It was my mistake. I was stated that the volume is 64dm³ and stupidly stated that it's 640cm³ since I wanted it to be more applicable to people with imperial system to understand, I admit that I made a mistake, but the solution as far as I know doesn't change. it was a stupid mistake.

 

[Regla]

I made a mistake, L is 40cm, 64dm³ is not 640cm³ it's 64000cm³. It's because we're dealing with volume not length.

 

[Nidum]

Don't worry . Just be more rigorous with you methods when doing future problems .

All done .