# Search results

1. ### Water vacuum pipe

so what would be the maximum diameter of the pipe to achieve 30ft of height?
2. ### Water vacuum pipe

i guess that at 33ft (1 atm) the water column pressure will equalize with the outside pressure . At 34 ft height, the additional 1ft height will flow out leaving 33ft of water. what about the relation between the volume of water in the bowl and the height of the column (volume in the column)...
3. ### Water vacuum pipe

hi to everyone, i have the following question, see attached image. a vertical pipe containing water is exactly 28ft tall. at the top (A) the pipe is tight shut. at the bottom (B)the pipe is open and ends in a bowl of water. since no air can enter the pipe, the water remains within the pipe...
4. ### Water column displacement physics?

Hi, in this setup we have a bucket of water 10 kgs of water inside. Attached is a weight meter measuring that in fig a. The weight is exactly 10kgs. In fig b. A piston (red) is being pulled by a weight (z). "z" has a pull force equivalent to the volume of the column of water above the piston...
5. ### Vacuum submerged in vacuum

so B is the correct option. the vacuum box, once ruptured would simply suck inside it a quantity of the water equivalent to its internal volume. no ""air gap"" will be created at the top of the column. thank for all the replies. i have understood the physics behind this setup.
6. ### Vacuum submerged in vacuum

hi to all, this one may sound silly but i just can't seem to understand how it will work out. this is the setup - in a vertical water column (state of vacuum) a hollow box is attached to the base. all air from the box has been sucked out and the box contains a vacuum(fig A). if the lid of...
7. ### Vacuum pump question

what if the balloon is made of elastic material that will cause it to contract by itself if there is no air inside?the elastic material will create the outside pressure needed will this solve the problem and lead to the expected result as shown in Fig 2? thanks
8. ### Vacuum pump question

thanks Nessdude, i am looking a creating at least 80% vacuum (rough vacuum). the comment regarding the shape of the balloon was very helpful. if i understood right even if all the air is sucked from the balloon it will maintain its initial inflated shape although it is "empty"? and that...
9. ### Vacuum pump question

hi to all, i have been trying to find some similar project solution on the internet but so far have found nothing, so i am posting here. here is the setup ( see attached picture) : in "fig 1" a metal chamber, perfectly sealed contains inside it a balloon filled with air (red color). the...
10. ### Ferrofluid pressure question

Yes, i have. Everywhere the quotes PSi is in the range of 4-6 PSI. I have never read anywhere of higher psi. That is the reason i am asking.
11. ### Ferrofluid pressure question

Anybody???:smile:
12. ### Ferrofluid pressure question

Hi to everyone, i wanted to ask if a ferrofluid exist that can withstand a pressure of 50 Psi? Does the "strenght" of the liquid depend on the strenght of the magnetiv field? Are there any such ferrofluids, or is this too much for the fluids available on the market? Thanks
13. ### Gravity question

see attached image. A "W" shaped pipe. Column A - ordinary tap water.Column B-salted water,33%salt just like Dead Sea water.there is no contact between the two columns of water. An air pocket is trapped inbetween the two columns. What will be the behaviour of this setup based on the difference...
14. ### Styrofoam object- rise or sink?

i have a 30 ft pipe - 10" diameter. there is a constant water flow at the top, keeping the water level constant ( the pipe is always full to the top). at the bottom the water just flows out of the basin and away. the pipe is is just 1" underwater in the pool underneath. the yellow object is a...
15. ### Styrofoam object- rise or sink?

thanks for the reply. anybody else?
16. ### Styrofoam object- rise or sink?

i have a 30 ft pipe - 10" diameter. there is a constant water flow at the top, keeping the water level constant ( the pipe is always full to the top). at the bottom the water just flows out of the basin and away. the pipe is is just 1" underwater in the pool underneath. the yellow object is a...
17. ### Orifice equation check pls

Homework Statement How much water will flow through a hole with diameter 1cm?we have a tubular container, water column 10 meters high- at the bottom is a hole with a diametr of 1 cm. the tube is constatly being refilled so the height of the water column remains the same - 10 meters.how much...
18. ### A little brain teaser )

ok, forget the frictionless seal detail, what i mena is there is no loss of water...i.e. all water leaked out below is compensated above, so water level remains constant. thanks
19. ### A little brain teaser )

a little brain teaser..:)) hi ...i'm having a hard time figuring out this one. see attachment pic. a water coluumn, square based tube ( 1 x 1 meters ) - height 10 meters. what will be the amount for the red weight at one side of the see-saw in order to push a styrofoam cube sized( 1x1x1meters=1...
20. ### Is this correct (buoyabcy forces - irregular object)?

hi, i have an irregular object submerged in water . i would like to verify if i've understood the forces that act on this: sides A & F - downward force due to weight of water above objects sides E & D - left nad right force - neutralizing each other sides B & C - upward buoyancy force how...
21. ### Nwebie,formula for drag of submerged object

surface of the rectangular block is styrofoam, coated with thin fibreglass film, so it is 100% smooth. shape is defined in the initial text. 10x
22. ### Nwebie,formula for drag of submerged object

hi, newbie needs a little help...what is the formula and could someone please take the time to explain in detail how to compute the elements in the formula for the following task. a submerged styrofoam rectangle with size H 100cm x L 15cm x W 50 cm. the object is submerged at 20 meters (60ft)...
23. ### Newbie needs some help kw/rpm relation

theory check: i have a hydro site that has generates 2000Nm of torque at 100rpm. this has been calculated at 20.95 kw. i am looking to attach a low-rpm PMG making 20kw at 250 rpm. if i use a gear box to achieve the 250 rpm (leading to a gecrease in torque 2,5 times=800Nm) will i be making the...
24. ### Wedge problem

hi, i have this problem that i am trying to figure out, but seems i need some help..:) ii have attached an image and an animation to clearly explain my problem. what i am trying to understand is will the green base with its 1000kg lift force be able to lift the pole with the red dot (950kg)...
25. ### Wedge problem

hi.. i have a problem that i need to solve.. in the attached mage, there is a submerged object in water cousing na upward lift force of 100kg. above it is a lever with a weigh attached to it weighing at 90kg. wll this weight difference be enough to move the metal wedge from point a into point...
26. ### Water pressure-displacament

help no idea whatsoever........i had the formula written down,but i can't access my notes from my current location.... any help tim???? 10x
27. ### Water pressure-displacament

anybody?? anybody???
28. ### Water pressure-displacament

hi... i have this question: what would be the force in kilograms to press the entire volume of water from the container up the pipe at 30ft. ( some of the water will remain in the pipe of course). see image: img374.imageshack.us/my.php?image=graphic1qh8.jpg BIG thank you Homework...
29. ### Water pressure question

anybody?? ANybody???
30. ### Water pressure question

hi, i'm stuck on a homework task i've been given..help will be greatly appreciated:)) image link: img168.imageshack.us/my.php?image=image1vn3.jpg setup is as follows: image 1 . a tube (1ft diameter) submerged in water. tube is filled with air-filled balls( 1ft diameter) which tightly fit...