1. S

    Shock in Water and Water Pipes

    Hello everyone... Help me out.. I installed a geyser 3 weeks back which has a rating of 15A and I connected it to a 32A MCB. This is connected to a 16A seperate MCB in the main board. Whenever I turn on the geyser, it works for some 10mins and then turns off without water getting heated. I...
  2. B

    How much weight required to submerge this object?

    Hi all, So A quick question for all the smart minds out there to ponder (plus I'm stumped and need help). I'm helping a friend out with a short film and we are trying to be cost efficient. I need to submerge a 2000L plastic tank (circular and approx 1.5 high) and then release it to make it...
  3. S

    How to describe motion of the wall of a liquid container?

    Hi, I wonder I cannot solve the following simple problem. I really don't know what kind of equations are relevant. Imagine a rectangular tank, with vertical walls containing some water. The surface area is big. The wall of the tank is movable without friction, and its mass is negligible. All...
  4. E

    Water in a pipe

    1. Water is flowing in a pipe at 5ms-1, the end of the pipe is held vertically and discharges into the atmosphere, the velocity of water discharging from the pipe is: a=0.25 b=1.3 c=5 d=25 2. The water in the question above will rise to a height in metres of: a=1.3 b=0.25 c=25 d=13 I will be...
  5. F

    Novice Electrical Guy with a Mechanical Question

    Hello All. This is my first post, and I hope it is not too simplistic, but I am out of my normal line of work here. I am trying to understand the relationships between flow, velocity, and cross sectional area with gases and fluids(air and water). Imagine a large vertical, cylindrical tank...
  6. R

    Why aren't turbines used in water supply systems?

    I had an idea to put a rotating mill turbine into the pipes that supply water to home tap systems. So that as the water flows through, the turbine is spun and electricity is produced. But why isn't this actually done?
  7. E

    Can Ammonium Bicarbonate 'salt out' ethanol alcohol?

    I'm testing Ammonium Bicarbonate in a fermentation process. Is it possible for Ammonium Bicarbonate to 'salt out' Ethanol? Compounds such as Sodium Carbonate and Ammonium Sulfate are able to salt out ethanol.
  8. C

    How much time will it take to heat water

    Homework Statement T1= 20C T2=80C Power=2kW Volume= 10liters Homework Equations Q= Power x time Q= m x c x DELTA Temp The Attempt at a Solution Do I need another equation to be able to find the heat? Since I have the equation of the heat I have the mass and I have the temperature but the c I...
  9. A

    Thermodynamics friction less piston problem

    Homework Statement Consider an ideal friction-less cylinder-piston arrangement, in which the piston is free to move between two sets of stops. When the piston rests on the lower stops, the volume available for the contained fluid is 0.5 m3; when the piston reaches the upper stops, the volume is...
  10. hemness

    Straight light beam in opaque water

    Hello! As this is my first post - I'm Mike from Poland, currently studying product design on Academy of Fine Arts in Warsaw. I'm working on a sculpture - light installation. I want to achieve an effect of a regular beam of white light - light cylinder in slightly opaque water. Sort of similar...
  11. P

    How does water volume affect electrical resistance?

    Hi, I've had an idea for a school physics project but I'm not sure if it will work. I want to measure the volume of water in a fixed shape container by passing an electrical current though it and monitoring how the resistance changes (with a potential divider circuit). My idea is that if I...
  12. P

    Hydrogen Bond Strength

    How do you strengthen and weaken hydrogen bonds in water aside from changing its temperature? Could you add any solutes to do so?
  13. J

    What happens when you remove an excessive amount of electrons.

    Lets take a simple water molecule for example. You can use the photoelectric effect to remove electrons from a molecule. As a thought experiment, lets say you have a contained single water molecule in a vacuum with no impurities. Perfect Vacuum. If you use the Photoelectric effect and beam...
  14. M

    Water nozzle

    Good morning, I always walk on egg shells posting what is probably a redundant question on a forum. I have been reading for two days and there is a ton of physics information out there on the subject but most of it doesn't truly address the mechanics of what I am looking for. In a very...
  15. N

    Why does water flow faster through a hose if its choked?

    A thought came to me while pouring antifreeze into my car today. As I pour in the anti-freeze it fills to the brim and takes awhile to flow through the cooling-system. However, if I choke the hose a few times it for some reason swallows the antifreeze faster. Is this similar to the bottle-neck...
  16. B0b-A

    [Gold] fish-eye view

  17. U

    Domestic Water Pump (1 HP)

    Hi there, I have spent quite some time on PF as an unregistered user reading through various stuff and have learned a lot. Just registered now to seek help on something that's been bothering me a lot and to which I haven't managed to find a solution yet. Please let me know if this is not the...
  18. E

    If Ammonia and Carbon Dioxide Gas are present, will (NH4)HCO3 form in any Polar Solvent?

    I know aqueous Ammonium Bicarbonate forms when NH4+ and HCO3- ions are present in water after they've dissolved from their gaseous states of NH3(g) and CO2(g). This occurs in the reaction: NH3(g) + H2O(l) + CO2(g) => (NH4)HCO3(aq) If Ammonia gas and CO2 are present above a polar organic...
  19. D

    How long does it take air to heat up water?

    I was hoping to find out how long it takes for 1000 ml water to heat up to air surrounding air temperature - is there a general equation that can be used to work this out? For example, 1000 ml of water = 14 deg C; surrounding air temperature = 18 deg C. In more detail the water container volume...
  20. A

    Specific Heat Capacity of water

    The specific heat capacity of water is accepted to be roughly 4.18 J/gK. How would the specific heat value of a given water sample be effected when sediments and other forms of particulation, such as iron oxide from rust, are present? Would the mixture have a higher specific heat capacity value...
  21. E

    Time for temperature of water to raise

    Homework Statement How long will it take to heat 40 gallons of water from 70°F to 120°F with a 20 kW immersion heater assuming no energy is lost the environment? Homework Equations It takes an electric tea kettle with 20°C water five minutes to reach boiling at 100°C. How long will it take for...