Water Definition and 1000 Threads

Considering a fish breeder decided to breed small fishes which needs a pH between 6,0 to 7,0 to stay alive. He needs to adjust the water's pH that is 5,0 to a value of 6.5, having available only calcium carbonate. The mass in mg added to 5L of water is about: A)2,5 B)5,5 C)6,5 D)7,5 E)9,5

Using water bath to maintain temperature of the component

I have a empty bottle and immersed it into the water, where the pressure inside the bottle is equal to air pressure. If I want to make a hole on the bottle, how big is the hole to prevent the water leak into the bottle at different depth? what kind of parameter is involve in this phenomena? can...

Due to the extreme drought, what is the minimum amount of water required to wash a small car such as a Corolla and how would you do it?

OK. I'm sure we're all in agreement that it is theoretically possible to float a cruise ship "in" a bucket of water, right? If not, maybe we need to sort that out first. A couple of practical provisos to start: Allow some leeway on what constitutes a Cruise Ship for our purposes. I submit that...

I'm trying to do the math for a backyard thermodynamic pump experiment, and getting stuck. Suppose an empty 3.79 liter container was airlocked by a vertical 25 cm long empty tube whose end sits at the top of an unlimited supply of water in a basin. The tube protrudes through the container such...

Hello all, I am trying to understand how a force at the opposite wall from water entering a pressurized air (atmospheric pressure) tank, and for this discussion it is rigid, with no relief valve to displace the compressed air can be deduced. I have created a simple illustration and believe this...

As our family drove along the highway, one of my 3 college boys started commenting about the water towers we were seeing. We started a deep discussion about how water towers work and that led to a fascinating discussion about water supply in skyscrapers that are clearly taller than your average...

Answer: I know that when water evaporates, it absorbs heat, that's why the process is endothermic. I don't understand why the water would be cooled and some ice would form, when the water is supposed to evaporate. What causes some water to be separately cooled instead of evaporated? Thanks.

This has been bothering me for a year. I saw a news report outlining the potential of a flood coming down a street. The street was lined with plastic barricades filled with water to keep the flood waters from getting to the buildings on the street. It seemed to me that since the specific gravity...

I have a question, say a wave of light is emitted, and it passes through water, changing it's wave length to 380nm inside the water, once it comes out of the water, to vacuum will the wavelength remain at 380nm or will it change?

Diameter of metallic ball : 3.000 inches SG of ball is : 2 ID of pipe is : 4.05 inches ID of seat : 2.885 inches Pressure behind ball when released from seat #1 is 1100 psi Fluid in pipe is Seawater (above and below the ball) Fluid flow rate after ball is released is 800 litres pr minute The...

[FONT=georgia]Question : [FONT=georgia]I start by putting the image of the problem from the book. The water surface is given to run along the (top) edge of the bridge. [FONT=georgia]Attempt : The crux of this problem lies in the fact that the pressure of water against the gate will vary along...

Hi I would like to design a water fountain/waterfall and want to know if i can pump water upward without using a pump. Perhaps using gravity and pressure. My planned size would be between 1 foot to 10 feet.Thanks

Containers are painted with the 7 colours of the rainbow; each colour corresponds to a different wavelength. Pour boiling water into each container. Which container would cool the fastest? Does the result change depending on whether the exterior or the interior or both are painted? The material...

Hi everyone After I've cooked beans in a pressure cooker, I put the cooker (with beans inside) into a sink full of water to help it cool down. After a while, the water heats up. At this point, would the cooker cool faster if I left it in the sink or if I took it out again? I'm guessing it...

I have calculated the wave length of a 36 kHz acoustic wave in 20 °C water to be around 41.16mm. Suppose I have a transducer that produces a 36 kHz acoustic wave and a small water container with a length of 41.6 mm. How will the standing acoustic wave look like, which is produced by the...

(a) $$V=\int_{0}^{x} A~dx$$ $$=\int_{0}^{x} f(u) dx , \text{u is dummy variable}$$ Is this the answer? Or there is something else I can do to continue the working? (b) $$\frac{dV}{dt}=\frac{d}{dt} \int_{0}^{x} f(u) dx=f(x).\frac{dx}{dt}$$ Is this correct? (c) $$\text{time}=\frac{\text{rate...

Started an irrigation project. There are 4 points in this irrigation system; A, B, C and D. The main water line to the house is 1" diameter pipe. (Point A) The distance from Point A to Point B is approximately 30 feet. Here at Point B the pipe size is reduced down to 3/4" pipe. The distance...

I wonder, what object can be drown to the deepest water ? I mean, the object where gravity is a lot more bigger than force of Archimedes

I like cup noodles that come with convenient packets of seasoning or sauce. From time to time I forget to take away all packets before pouring hot boiling water into it. In most cases those packets are printed with color and are made of kind of plastic or tin or something with metallic color, I...

Does the scale change during the block sinks? I am so confused... Is there any difference on change of scale with the applying of drag force?

So first I looked at where the image of the fish appeared to be when it went through the water surface. since we can assume the water is flat, R is infinity, so n1/p=-n2/q. plugging in the values (n1=1.29, n2=1, p=3.5) I get q=-0.3686. So the image of the fish appears at 0.369 above the...

What actually caused the sound made by rushing water, for example in rapids. Is it molecules bumping against each other? Or something else?

I have a lot of acorns in my pebbles. I'm looking for a way to sort these out quickly. I was thinking of the possibility that something floats on water and another material does not. If I use plain water, most of these acorns will sink too. So my questions is how much salt or other product...

The solar wind driven removal of water from Mars can only explain a portion of the water thought to have once existed there. This process, indicated by the D/H ratio of normal hydrogen to its heavier form (deuterium) of Martian hydrogen, can only a count for the lower estimates of Martian...

https://www.sciencealert.com/scientists-finally-know-how-this-ancient-reptile-lived-with-such-an-absurdly-long-neck?fbclid=IwAR3Ibk7KyqKHrnkoKa-7C0kPvWKGVG1hjWnRgFfkTS54wJiZ9W5E2BYCFHY I didn't infer from the text that the dino's neck rose vertically from the bottom to the surface - it may well...

Please don’t laugh, this may sound a trivial question, but it is important. I have seen so many conflicting opinions, even from manufacturers. Some say, just use the biggest bore possible, others say use a small bore 8mm for a fully pumped system & a large bore 11mm for a gravity system. There...

Is the Uganda water experiment (that shows corilios effect on water drain) a scientific experiment or not? I searched but I couldn't find a final answer to this question. There are two opposite opinions, which one is correct? Or this argument is an open issue yet? Thanks for your replies...

I have solved the first 2 parts. For the 3rd part, I have obtained the equation: T(x) - T0 = (T1 - T0)e^(-Φx/fc), where f = fm in the question. How do I obtain that expression for H? Thank you!

I was asked this question: Assume you're sitting in a boat (you and the boat, together, are a mass M) which also contains a heavy object (of mass m). The boat (inc. you and the heavy object) is floating in a pond (a fixed body of water, rather than open sea). If you throw the object overboard...

A water cooled plate condenser, condensing refrigerant. Heat exchanger (condenser with plates) characteristics: Description symbol value value (converted) number of plates np 28 number of channels nc 27 number of water channels nwc 14 number of flowing channels for refrigerant...

2.5% active chlorine + water is very volatile and spreads around the house oxidizing metals and other objects ?? here we use a product called sanitary water

So all of the ice melts and I am guessing it then warms some so Q=mL+mc(change in T) for the water that cools down Q=mc(change in T) Q_cold = -Q_hot so -mc(Tf - Ti) = mL+mc(Tf - Ti) My issue is that I have 2 unknowns. I don't know the specific heat capacity of water and I don't know the...

Is the heat generated by flowing water in a pipe proportional to the product of the rate of flow and the pressure drop across the section of pipe in question, analogous to an electrical circuit? If so, what units would you plug into get an answer in watts?

I need to calculate the overall uncertainty of the value I have obtained for the speed of sound in water, using Mackenzies equation... I am not sure in what way to combine the above uncertainties. Any help would be greatly appreciated! Lloyd

I think that adding water here shifts the reaction to the left in favour of reactants (since the amount of product is increased). This will also decrease the concentration of [Co(H2O)6]2+, Cl-, and CoCl42− too (dilution), but I'm not sure how much that would affect the direction that the...

suppose i have liquid and vapor water inside a vessel at say 3000kPa, then i suddenly open the valve, as the water (liquid) flows out the vessel (control volume) is water inside the cv evaporating at the same rate liquid flows out? so the volume of water inside the cv remains constant?

Hello there, I was wondering, and i can't seem to really find the answer to my question, i found something that looks like it, but I am not sure if i understand correctly, that why I am turning to PF.com 1) What is the basic formula of the force on a object in flowing water when we assume that...

So since the block is at the bottom there's no pressure pushing it up. To calculate the mass and force of gravity, I multiplied the density of the block by its height and cross sectional area and got 564 kg. Multiplying this by 9.8 I got the force of gravity of 5527.2 N. Now to find the force...

I'm so sorry if this is a bad question! I am doing an experiment measuring the rate of gas production (hydrogen) of the electrolysis of water, and I got myself a bit confused about whether I have been taking the correct measurements? I had originally thought that, since the "concentration" of...

This is the set up to produce stationary wave. The oscillator on the left will produce wave on water surface then this wave will travel to right, reflected at the tank and the incoming and reflected wave will superpose to form stationary wave. My teacher said when the water wave hits the tank...

I'm trying to complete this past exam paper Q. Water volume = 200hl = 20000L 1L=10^-3 m^3 20000L = 200 m^3 Density of water at 15 deg C = 999 kg m^3 Density = Mass/Volume 999 kg m^3 = Mass/(200 m^3) Mass of water = (200)(999) = 199800 kg Heat required to to heat 199800 kg water: Q =m C dT =...

Hi there, I'm doing a past exam paper Q and i'd like some help. Assumptions are: The velocity in the tank is negligible and the hydrostatic head is 4m. Pressure in the vessel: Gauge pressure 1 bar g = 10^5 Pa 0.2 bar g = 20,000 Pa Hydrostatic Pressure: (4)(9.81)(978) = 38,376.72 Pa Absolute...

What are we missing in this experiment? Thanks

I wondered if anyone could help, I work in the fire protection industry. We currently have a project using a pressurised cylinder. The cylinder hold 200 lites of water plus 40 litres of nitrogen gas as a propellant at 10.0 bar. I’m trying to work out once the 200 litre water volume has been...

I am thinking of using ΣF = m.a to find the acceleration but I don't know what causes the resultant force to the right. I thought it will be the difference in pressure on the left and right leg of the U-pipe (picture on the right), which is ΔP = ρ.g.h but the force (ΔP . A) won't be directed to...

If you bring a pot of water to boil, you will notice that the bubbles form on the bottom surface of the pot. This seems to make sense intuitively as this is the hottest surface, so this would be where the boiling action starts. When I was in school during a thermo lab we pulled a vacuum in a...