Water Definition and 1000 Threads

Homework Statement A five-liter pot is filled with 2 l of liquid water and 3 l of dry air at the ambient pressure of 1 atm and temperature 10◦C. Subsequently, the pot is closed and heated up. What is the pressure inside the pot going to be when the temperature reaches 100◦C? Homework...

there's a stationary pebble on the flat shore of the beach. As the last of the wave heads back out to the ocean, it moves over the pebble and creates.. "lines" similar in shape to eg air stream around a jet, etc Wondering what these 'waves' are called?

Homework Statement A glass bottle of nominal capacity 250 cm3 is filled brim full of water at 20oC. If the bottle and content are heated to 50oC, how much water spills over? (For water, β=0.21X10-3 K-1. Assume that the expansion of the glass is negligible.) Homework Equations (dv/dT)/v =...

What are the differences between carbon dioxide solubility (miscibility, reaction) in liquid water when in gaseous (<38 bar) and liquid (>38 bar) phase? The temperature in my experiments is usually between 0 and 5°C. The stirring speed is around 500 rpm. Is the solubility given apart from...

Hello Everyone, I am brand new to this forum and I am currently doing "student research project task" where I need to conduct my own experiment basically. I am currently struggling to find a formula for an impact velocity. I hope there is someone in this forums that could help me. What I...

I am a crane operator and have prob, a very simple question for any of you. I set a dredge in a pond and when I set it in the water it weighed 80,000 lb. My question is when I'm hoisting it back out how much will the weight increase before it is free from the surface of the water.

Hi, I'm setting up an equation for initial gravitational potential energy, and I'm just wondering what the moment of inertia, I, would be for a water bottle rolling down an inclined ramp? Is it mr2 or ½mr2 Or would it be something else?

Hi, I am doing my dissertation for Mechanical Engineering on Solar Stills and my mentor has suggested it would be a good idea to research the physics of light/infrared absorption, transmission, water evaporation and condensation. I am wondering if anyone has good book recommendations for me to...

Homework Statement Homework Equations The Attempt at a Solution [/B] My questions: 1. By resultant force, does that mean the force exerted on the side of the water + force exerted on side of the oil? Because I'd think that the force on the side of the water would be different than the...

Homework Statement You may have noticed that water sometimes drips from the exhaust of a car as it is running. Is this evidence that there is at least a small amount of water originally present in the gasoline? Homework Equations not sure if there is one. The Attempt at a Solution I'm not...

What is the difference between water power and turbine power? Do they have the same formula?

Hi, I'm trying to do some stress analysis on a tank filled with water, I have split the walls into sections and applied the appropriate pressures. However, I'm confused as to whether I apply the weight of the water+pressure at that height difference to the bottom of the plate; or will the...

Suppose you have a glass of water, and you beat a spoon on the bottom layer of glass through the mouth of glass, repeated beatings in a regular fashion will cause in increased frequency of sound produced due to the spoon beating?What causes such increase in frequency?

Hey, I'm a student who has to complete a written assignment for physics. I chose to launch water rockets and investigate the effect of volume on the range. I am trying to also come up with a mathematical model however I am struggling to understand an equation I found the following equation to...

Hello, I've made a version of Kelvin's water dropper for a school project, but it is not charging up. I've made the supports with PVC and the base with plywood. The water collectors are placed on Styrofoam blocks and the water flows through holes made in 2 plastic bottles. The inducers and...

So I understand generally how humidity in atmospherics work but there's this one thing I can't reconcile with the fundamentals. First, my understanding of the basics. Water boils at 212 F @ 14.7 psia (1 ATM). At 213F @ 14.7 psia that water is now 1F superheated vapor. So we're all on the same...

How to calculate the speed of cross flow water turbine? Help, I'm struggling on our machine design.

When a stream of water falls perfectly vertical, some water hitting the surface will disperse horizontally. What is the force that causes this? References would be awesome!

I am currently modeling the altitude that a water rocket can attain. In order to do this i am first modeling the the thrust phase. Due to the water mass decreasing with time (the same goes for the pressure - it decreases over time as the water is expelled out of the nozzle). This is an...

I am an amateur scientist interested in all fields of science. What voltage potential is used to measure the EC of water to approximate TDS of filtered tap water?

I was surprised to see this in a 'pop science' article a few years ago ("Ask Marilyn"), but quickly found the source, which appeared reputable (to me). But I have not seen any follow up. I finally got back to it. https://www.nature.com/articles/ngeo1476 To stay within forum guidelines, please...

Would a black hole whose density is lower than that of water, sink? The answer is likely over my head. So far, I've found 5 answers by "experts", with quite different opinions. For instance on this website, one reads . On IRC I was told by another expert that it would sink. Here are the...

Homework Statement The first law of thermodynamics may be expressed in the form: ΔU = q + w, where ΔU is the increase in internal energy, q is the thermal energy supplied to the system, w is the work done on the system. Is ΔU, w and q positive, negative or zero when ice melts at 0oC to give...

We have a glass containing 0.5 liter (0.5 kg) of water whose temperature 100 degrees Celsius. We also have an ice cube with mass 0.01 kg and temperature -10 degrees Celsius. The cube is put into the glass. The glass is then insulated from the outside world, until the cube has melted. What will...

I guess water in Earth , in big lakes or seas, looks blue because the Earth's sky is blue and the water's surface reflects the sky. Now if there would be some big lake of water at Mars, how the water surface colour would be? I guess the colour of Mar's sky which is red (right or wrong?) It is...

The analysis is based on 29 radar profiles collected between May 2012 and December 2015. The identified region is about 20-km wide. The report acknowledges the results are consistent with with water or water-laden sediments. A brief discussion on the BBC (with no citations) asserted that...

Homework Statement 3kg/s of fresh water traveling through a pipe of 40 mm, I need to find out the velocity in m/s Homework Equations I have tried the equation: 3 / 40The Attempt at a Solution 3 / 40 = = 0.075m/s But not sure if I have to covert 3kg/s into another value before entering the...

Am I correct in saying that water pressure (in typical domestic heating system pipework) is achieved by deformation of the pipes rather than compression of the water? I believe water to be virtually incompressible, so the 3 bar (or whatever) pressure must come from the elastic stretching of the...

Hi all, first post. Bare with me. I've got a simple air compressor-powered water balloon launcher made using PVC. It works extremely well. But, I'm needing to make some "sighting charts" to predict where everything will land based on angle, loaded psi, size of balloon---and the wadding...

A water pipe whose diameter is 84 cm dan length is 2,4 m can contain rain water with the water height 68 cm like in the attached picture. Determine: a. The surface area which gets contact with the water b. The volume of the water (in liters) So... How do I do? What is the simple way to...

Homework Statement A runner weighs 687 N and 71% of this weight is water. (a) How many moles of water are in the runner's body? (b) How many water molecules (H2O) are there? Homework Equations n = N/NA n= m/mass per mole NA = 6.022E23 F=ma H: 2*1 O: 16 The Attempt at a Solution a) 687/9.8=70.1...

Homework Statement A metallic spherical shell of mass M and radius R is fully filled with water of mass M is set into pure pure rolling motion on a smooth horizonal surface (w clockwise, v to the right). Now water is freezed suddenly, and the ice sticks with the shell. What is- a) moment of...

Homework Statement Find the mass of water that vaporizes when 3.02 kg of mercury at 223 °C is added to 0.347 kg of water at 83.4 °C. Homework Equations Mercury Q = Water Q + Water mL mc∆t= mc∆t + mL The Attempt at a Solution mass of vapor = ((3.02)(140)(223-tfinal) - (4186)(.347)(change in...

I want to design a curding machine (Milk to Cheese) with an open system that operate at isobaric process (contant pressure), P = 1 atm = 1,... bar the range of temperature is = 25-75 0C can i find an enthalpy of water from Mollier Diagram if my temp. is 25 to 75 degree celcius ? how ? from my...

We all know that the photons have a wave-like motion,if the waves on the water form because of the motion of the particles inside the air(oxygen+nitrogen gas and %1 another gasses) so in the beginnig of this process,photons hit the air and make particles jiggle and that make air jiggle and air...

Hi, I have a question about a rising bubble. I read that the initial acceleration of a bubble (with negligible mass) in water is 2g, where g is the gravitational acceleration. I understand that if a bubble rise then the water move around it, but I can't derive this equation. Could someone help...

I am having difficulty solving an exercise prepared by our professor for hydrodynamics. I am unsure if Laplace pressure is the correct way to calculate the pressure inside. It comes to my mind that I should've used the equation for hydrostatic pressure instead (##P=P_0+\rho gh##). However, the...

Is entering force will be same when a body enter in two box one filled with water and other filled with air. Both boxes have same pressure 7 bar and velocity of body at entering point is 9 m/s

Homework Statement A baseball has a terminal speed of 42 m/s in air (ρ = 1.2 kg/m^3). What would be its terminal speed in water (ρ = 1.0 x 10^3 kg/m^3)? A) 0.05 m/s B) 1.5 m/s C) 18 m/s D) 42 m/s E) 1200 m/s Homework Equations D=½Cρ*Av^2 where the magnitude of the drag force (D), relative...

Homework Statement Hollow iron sphere is half submerged in water.Sphere has outer diameter of 10 cm. Calculate thickness of the wall , when the iron density is 7.9 g / m3. I get answer 0.11cm, book says that it is 0.22cm. Homework Equations [/B]The Attempt at a Solution First i found buoyant...

ρ I am trying to estimate and validate the pressure of water exiting a nozzle. For an unknown reason, the validation is consistently twice as high as the estimation. Here the approach: Estimation: I am using the dynamic pressure equation for the estimation: q = 1/2 * ρ * u2 where, q = dynamic...

Hey everyone, I’m trying to simulate a 1D Shallow Water wave in FORTRAN using the Lax Wendroff Method. The case is fairly simple. I have a wave generator on one end of a water pool and a wall boundary on another. The waves start traveling towards the wall and are ‘reflected off’ the wall. The...

We all here (I presume that members here have better understanding of physical processes than average person) know that it isn't a fact that water began to boil at 100°C but much before that. When being heated in an open pot, as the temperature rises, water began to boil and more and more water...

When you heat a pot of water why wouldn't the water temp decrease slightly when it starts boiling? Isnt boiling a type of evaporation? In evaporation the molecules near surface have enough KE to escape into the gas phase, which then lowers the T of the remaining liquid. That is how sweating...

I have a problem where I want to find out the static pressure over a city in a water pipe system. As I know the elevations over the city I was first thinking of just using p = rho * g * h, but this should only apply if the pipe system were under water (if I use the density of water at least). So...

Homework Statement : [/B] The cross-sectional profile of a dam is shaped as an isosceles triangle. The dam is standing on horizontal ground and the watermirror is as high as the top of the dam. The dam has height h, length l and the distance from the bottom to the watermirror along the dam's...

Homework Statement A metal cube is placed in an empty vessel. When water is filled in the vessel so that the cube is completely immersed in the water,the force on the bottom of the vessel in contact with the cube (A) will increase (B)will decrease (C)will remain same (D) will become zero...

Complete question: Will flow ever reverse or stop if we increase resistance in this pipe scenario? There are 2 comunicating vessels. The highest vessel is coninuosly alimented with new water. Water in excess flows down on the sides. Water will try to reach the same height in both vessels, so...

Hi. Most water towers store their water in a huge container at their top. Why? Wouldn't it be easier to place the container at the bottom and just add a long, thin pipe upwards to create the hydrostatic pressure? Is the problem that the container would need to endure too much pressure? Or that...

When designing the structure of an elevated water tube ride (water flows by gravity through a tube large enough to accommodate 2 people on a float, say 500 lb. max. and the volume of water is constant) how much effect does the object floating on the water have?