Water Definition and 1000 Threads

Hi, everyone. I'm working on a personal project and I need some insight from the intelligent minds here. I'm trying to calculate the thrust that a jet motor on a marine craft needs to exert in order to accelerate the craft in a certain direction. What are the necessary factors to determine the...

Homework Statement A person of mass M is walking across the ground carrying a heavy bucket of water of mass m on top of their head. Which of the following forces is not acting on the person? a) The gravitational force on the person Mg acting downward b) The normal force from the ground acting...

A liquid in a U-tube maintains the same level in both the arms. When another liquid which does not mix with the first one is poured in it, the air interface with either of the liquids in both the arms will be at different levels. Considering a point at the top surface of liquid A, the pressure...

So I was on my way to school this morning and looking at the beach made me think of something. Why doesn’t the water on Earth fall out and into space? Like, if you really didn’t think too hard, you’d be like, yeah, the Earth is tilted, so why, doesn’t the water fall out like a glass of water? If...

Homework Statement n/a Homework Equations n/a The Attempt at a Solution n/a Just a question. I keep seeing that in SN2 reactions, sometimes a molecule is quenched by H2O or H3O. I've seen it turn an O- into an OH and also a heteroatom into an H. What exactly is going on here?

Homework Statement Lets consider a rod of length l that is attached at a point to the cealing and relvolves freely. Half of the rod is immersed in water and half of it is out of the water. The rod is not vertical it has around a 60 degree angle to the water. Where is the line of action of the...

It will be very helpful if someone suggest any articles or reading materials on this topic for detailed study.

Hello. I have an engineering idea, an invention. I want to make a watering valve for plants that opens the water when the soil moisture content is too low. I am looking for a material that (1) would not rot, and (2) absorb water and contract at a significant rate to open a valve (millimeter...

I just learned that an incompressible fluid must have zero divergence within a given control volume. Given that the divergence of a fluid at a point(x,y,z) can be found by taking the scalar sum of the of the x, y, z acceleration vectors at the given point, wouldn't this mean that water flowing...

I want to remove manganese (0.7 mg/l) by aearation, from well water in an plant in which I have only chlorination sistem.Will the oxigen adition affect the action of cl2? On which point I should be careful? I want to make oxygenation in the same tank in witch i will make the chlorination. Would...

NASA announced in 2015 that they found some evidence for the existence of liquid water on Mars today - at least temporarily and underground. A new study comes to a different conclusion and proposes sand as origin of the observed material transport downhill. As interesting as these features...

Hello When mixing a strong acid and water, the temperature increases. There is production of water molecules from H + and OH- ions. If you plunge a glass of pure water into an intense electric field, the ions present in the pure water will migrate. The pH equilibrium will no longer be...

Homework Statement Calculate the volume of 1.00 mol of liquid water at 20°C (at which its density is 998 kg>m3),and compare that with the volume occupied by 1.00 mol of water at the critical point, which is 56 * 10-6 m3. Water has a molar mass of 18.0 g>mol. Full answer please! Thanks...

Homework Statement When completely hollow. To what fraction of volume should water be poured into it so that it is just enough to cause the sphere to sink. [/B]Homework Equations Archemedes : Buoyant fource equals weight of water displaced The Attempt at a Solution Let's first find the...

Homework Statement How do I draw all forces on a stone sinking in water? And what are the names of the forces? And will the stone reach terminal velocity and be sinking in constant velocity? Homework Equations In some websites they just draw buoyant force and gravity force. But in other...

You know how they always say that without water there would not be life, right? Astronomers also look for life on planets with hints of water in their spectrum. But is water really necessary for life? Some ET life could not be a tiny bit similar to ours and might not even need water or water...

I'm trying to guess when my hot tub will be ready for use. If an ideal body of water is insulated and has a constant source of heating applied to it, can its temperature be expected to rise linearly? (No. Even as I write this I see it can't be true. As the water temp rises, it will approach...

Hello, All substances that are either in the liquid or solid state have a small vapor pressure which implies that they are always slowly (solids especially) evaporating and turning into a gas (vapor). The phase diagrams of water and carbon dioxide indicate only states (P , V) of pressure and...

Water vapor exists at a higher energy state than liquid water...but does that make a difference in the absorption bands? In other words, are the absorption bands of vapor and liquid water identical? Thanks!

Homework Statement A certain mass of water in a copper pot is heated over a stove that releases joules of heat to heat the water. Later the same mass of water in an aluminum pot is heated over another stove that releases the same amount of heat in order to heat the water. Then the water in...

Look into this url https://www.nasa.gov/mission_pages/mars/news/mars-20070315.html Some points to note are * The polar region contains enough frozen water to cover the whole planet in a liquid layer approximately 11 meters (36 feet) deep. * The radar sees through icy layers to the lower...

I tried using the Bernoulli equation to solve this. I took two points at the surface of the water in both the containers and formed this equation: gh_{b}=\frac{1}{2}v^2+gh This is assuming that the velocity of the water in the large tank is approximately zero and using the fact that both the...

I am taking a my first water management course and I need your help getting through my first Water Supply Reliability Modeling assignment. It involves a data set that I must manipulate and a problem set. I am not a civil engineer, so I do not know where to start with this. The only hint I have...

Homework Statement Consider a spherical particle immersed in water. It will experience random collisions with the surrounding water molecules. Suppose there are such water molecules around the particle. Half (n/2) of the water molecules will push the particle to the right and the other half to...

Are there any type of minerals/molecules/elements even solids that when dissolved, in say a glass of room temp water, can raise or lower the temperature? Examples...

Homework Statement Homework EquationsThe Attempt at a Solution I thought the pressure in a water line is in gauge pressure, but the solution suggests that 1630 kPa is in absolute pressure, do we always assume absolute pressure unless otherwise specified?

Capillary action is a form of work, i.e. an object (water) moved by a force (capillary action) over a distance. Since all work requires energy, what supplies the energy for capillary action? Is the chemical energy of the water increased by adhering to a surface? Perhaps the heat energy of the...

I don't care whether it goes clockwise or anticlockwise so this is not the usual Coriolis conversation. Why doesn't it just go down straight?

Lets say you have a jar of water, and a jar of air. You heat both of them 100C will either of them explode? ok just kidding. which one exerts more pressure, and is hence more likely to explode? did heating the substance turn heat into force? (force per unit area)

Homework Statement A scale is adjusted so that when a large, shallow pan is placed on it, it reads zero. A water faucet at height h = 4.0 m above is turned on and water falls into the pan at a rate R = 0.20 kg/s. A) Determine a formula for the scale reading as a function of time t if at the...

HI All, Has anyone experienced strange behavior with capacitive level sensor? They fail (not detecting fluid) at certain point and after leaving them alone for couple of days start working?

Dear all member, Im alan, and i need some help,,, Did you guys know about floating solar panel? So, I am going to make a product that will float and can support the solar panel (20kg). And know I am in the calculation stage, so i need to know, that my product can : 1. Float 2. How much weight...

Homework Statement 1kg of moist air of RH 70% at 21oC is cooled at a constant pressure of 1 bar to 5oC. The vapour pressure at 21oC and 5oC are 0.025 bar and 0.0087 bar. The percentage of water vapour that condenses into water at 5oC is? Want to check whether my intuition & logic are correct...

Homework Statement An oil tanker spills a large amount of oil (n =1.47) into the sea (n = 1.33). a) If you look down onto the oil spill from overhead, what predominant wavelength of light do you see at a point where the oil is 390 nm thick? What color is the light? b) In the water transmitted...

Homework Statement A 0.14-km wide river flows with a uniform speed of 4.0 m/s toward the east. It takes 20 s for a boat to cross the river to a point directly north of its departure point on the south bank. What is the speed of the boat relative to the water? I'm mostly concerned about the...

Hi everyone, nice to meet you. My name is Laura. I am a 3rd year physics student at University of Oregon. I have worked at Intel Corporation for the past 3 summers and most recently worked with a metrology team to develop Raman spectroscopy processes and data processing software/algorithms. I...

My colleague has been developing a hybrid water/forced air heat transfer system for a prototype lighting solution we are developing. I am struggling to get my head around the calculations required to figure out exactly how many watts of energy (heat in this case) are being transferred to the...

Cheers everyone. Can the amount of water molecules added to a solution impact the formation of a salt with its ions mainly bonded through hydrogen bonds with electrostatic like behaviour? Let me give Some background to the question first: I am studying the precipitation of Phosphorous(P) as...

Hello All, I would like to know why it´s so difficult to find information about the generation of fringes in a one slit interference experiment in a water tank. Best Regards, DaTario

But not for the reason or application you might think...lol I live in SE Texas, just south of Houston. It is hot as balls here in the summer. (Which accounts for three of our seasons here) My neighborhood is on a "community well" type water system, and the well is in the back of the...

I've read about water heaters needing anodes, but I don't really understand why. The objective is that the anode should protect the tank by "attracting" corrosion, isn't that right? But aren't water heaters usually made of stainless steel anyway? Around here most water heaters don't have an...

Hello all, I was going through study of gravitation of earth. The book teachs that gravity of Earth is more near poles than at equator as Earth is not perfect sphere rather radius of Earth is lesser near poles larger at equator. A thought came in my mind that if the water at level goes also...

Hello Homework Statement Lets say i have the given parameters: air volume flow : V = 36 m3/h Relative humidity: RH=33% air mixing ratio : X = 5.5 (1g H2O) / 1kg (DRY AIR) (calculated from RH) air temperature : T= 20 C So i know how much mass of water is the air compared to the air's "dry air"...

Question: The speed of waves in shallow water depends only on the acceleration due to gravity (g) and the water depth (h). Which of the following formulas describes the speed of the wave? a) (1/2)gh^2 b) gh c) h/g d)(gh)^(1/2) Attempt: Change in V = at t= ΔV/a Δx=vt+(1/2)at2 Δx =...

I'm sorry if I am intruding on this forum, but I have a question that requires a knowledge of physics. I am preparing a plan now to convert a school bus into an RV. I have raised tropical fish all of my life and would like to keep doing so. I want to put a 125 aquarium in my RV so that it is...

What do you guys think of this concept. https://www.sciencedaily.com/releases/2017/09/170926125154.htm

It is reported that TiO2 thin surface amorphous layer left after acid-etching with hot HCl-H2SO4 solution slowly changes from the original flat surface to a layer rich in nano-scale features (granules attached to the surface) of 20 ~ 30 nm in size. You can see these nano-features in the picture...

This is a hypothetical question: since hydrostatic pressure is calculated as depth of water times its density, would a column of water less than a square foot in cross section still have a pressure at the bottom of depth*density of water? For example, if I had a 1" thick by 1ft wide by 5' tall...

I have a discussion going on with some friends. The discussion goes like this: We have two identical tanks. One is empty. One is full of water. Both placed on the ground. They are connected with a hose at the bottom. There is a ball valve in line with the hose. The full tank has a given...

Why does cyclohexane float on water.? When I add up their relative molecular masses water has a lower value than cyclohexane?