# Search results

1. ### 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...
2. ### 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...
3. ### 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...
4. ### 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...
5. ### 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
6. ### 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...
7. ### 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...
8. ### 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...
9. ### 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...
10. ### 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...
11. ### 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...
12. ### 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)...
13. ### 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...
14. ### 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)...
15. ### 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...
16. ### 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...
17. ### 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...
18. ### Method for instatnt cooling of water

any suggestion on the most efficient method to cool water from 25C to 10C . the volume of the water is 1 cubic meter....? thank you