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Water pressure in a tank

  • #51
Nidum
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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 .
 
  • #52
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?
 
  • #53
Nidum
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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 ?
 
  • #54
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?
 
  • #55
Nidum
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That's the correct answer for the water volume - good result .

Certainly ok to ask new questions anytime .
 
  • #56
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?
 
  • #57
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.
 
  • #58
Nidum
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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 ?
 
  • #59
haruspex
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64dm3 is not 640cm3
In post #1 you wrote 640cm3. Are you now saying that was wrong, that it is 64dm3?
 
  • #60
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.
 
  • #61
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.
 
  • #62
Nidum
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Don't worry . Just be more rigorous with you methods when doing future problems .

All done .
 
Last edited:
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