Water Definition and 1000 Threads

Hello! This question is not about a particular homework exercise, or any exercise, but rather an astonishing real life fact, which I just experienced, and, as I am still on my way to becoming educated in science, I would like to ask for your help on how to explain this phenomena. I had a...

Given equal power at the sound source - is the amplitude (in pascals) of sound pressure waves greater in water than in air? - What is the mathematical or physical bases of any difference?

Homework Statement A tank contains 800 gal of water in which 200 lb of salt is dissolved. Two gallons of fresh water runs in per minute, and 2 gal of the mixture in the tank, kept uniform by stirring, runs out per minute. How much salt is left in the tank after 5 hours ? Homework Equations...

This may be an odd question but I am wondering if water speed affects a bullet's ability to penetrate water. Pardon my lack of knowledge, but I am aware that low caliber bullets can penetrate water past 3ft (Thank you Mythbusters). However, the tests they completed were all based around a pool...

Homework Statement 300gm of water at 25°C is added to 100gm of ice at 0°C ,find the final temperature of the mixture .Also find the final composition of mixture . Homework Equations [/B] Specific heat of water = 1 cal/gm/°C Latent heat of fusion of ice = 80 cal/gm The Attempt at a Solution...

Homework Statement The temperature of 100 gm of water is to be raised from 24°C to 90°C by adding steam to it .Calculate the mass of the steam required for this purpose . Homework Equations Latent heat of vaporisation of steam = 540 Cal/g The Attempt at a Solution [/B] Let 'm' be the mass...

Homework Statement 1Kg ice at -10° C is mixed with 1 Kg water at 100°C .Then find equilibrium temperature. Homework Equations Specific heat of water = 1Cal/g/°C Specific heat of ice = 0.5 Cal/g/°C Latent heat of fusion of ice = 80 Cal/g The Attempt at a Solution [/B] Heat required by ice...

1. Homework Statement A fresh water storage tank in a factory is shown in the figure above. Its top side is denoted as C, the narrow side as B and the long side as A. In order to allow regular maintenance and cleaning side A is hinged at its bottom edge and secured using a heavy-duty clasp at...

I'm having trouble finding any valves to use for my certain application. What I'm doing is trying to capture water droplets into a sealed container. What I need is some sort of check valve that needs nearly no pressure to let water through, but keep it contained once it has gone through the...

This NOVA documentary outlines the events of the Flint water crisis along with the science that uncovered the truth: http://www.pbs.org/wgbh/nova/body/poisoned-water.html It also gets into how the science, the citizens of Flint and the scientists were repeatedly attacked and discounted by the...

My textbook says that formation of petrified trees is a result of a degradation and a sedimentation action of theunderground water, and then it goes on explaining that the underground water replaces the plant material in the tree with silica and other inorganic materials, which I think is a...

A water cooler can hold 40 litres of water when full. What fraction of water is left in the cooler if 16 litres is used? Solution: 16 out of 40 litres have been used. 16/40 litres. Reduce this fraction to lowest terms. 16 ÷ 8 = 2 40 ÷ 8 = 5 Answer: 2/5 litres remain in the water...

Homework Statement Find the mass of water in this container when given a data plot of temperature (C) and Heat Added (kJ) I have NO idea where to even start with this.

Hi there, Is there any method to calculate the amount of steam condensed to form water? Let's assume 1000 lbs of superheated steam at 4000C condensed to water at 450C. What will be the amount of water? I have calculated it through specific volume but it returns with a very minimum value.

Hi All, Looking for some help (any is greatly appreciated). I've been tasked with the below, and am unable to find a worked example to cross check my work against. If anyone with a greater knowledge than me could have a look at the below and advise if I'm right the right track. Thanks 1...

I was looking online for some solution to my question, and they varied from explaining it using potential energy to pressure equalization between the floor of the liquid between the bases. I still cannot seem to find my groove with this one. Tackling the pressure explanation, someone said that...

I have been thinking, looking for an answer. It is known to me that drinking pure H2O is bad for the body, reason is it saps all of the minerals from the body since it does not contain any. I have been thinking, if I take salt water from a certain sea, put it in a container and boil the water...

Homework Statement Hello everybody! One surface of a biconvex lens (n=1,5) is in the air (na=1) while the other surface is dipped in the water (nw=4/3). If the power of the lens in the air is Po=10 Dioptri, The lens power in such condition is? Homework Equations Lensmaker Equation...

I'm doing a little project of mine and am currently trying to figure out if my machine(being built) would work how i want it to work. So i have a tube that goes in a full circle, this tube has 2 hand cranked turbines that give the water its initial motion to go round and round. Theres little...

Hi everyone. I have a question with a DLC (Diamond-like-carbon) coating. In many papers, the DLC coating without hydrogen (a-C or ta-C) shows very good frictional properties and wear resistance with water lubrication. I'm studying on eco-friendly engineering, so I surprised that water can be...

Homework Statement So I sent a humidity sensor up in a weather balloon, which gave a reading for relative humidity. I eventually want an absolute humidity, but I am unsure whether I need to correct the output based on the changing density and atmospheric pressure with altitude. Homework...

Imagine some giant glass(or other material) dome placed on top of some ocean or lake. Then pump some air out of this dome, until the water level rises a few meters under the dome. Place another dome below the first dome, and repeat the process, resulting in a little less pressure in the second...

I have a plastic container holding about 30 gallons of water, and it is bowing. Do I need to be concerned about it breaking?

If you are stationary say 10m below the ocean surface does the water pressure at your location vary with the waves. For example: When a wave crest is above you than means perhaps 12m of water is above you. Then a few seconds later a trough is above you so only 8m of water is above you. So you...

1. The problem statement, all variables, and given/known data Two vertical cylinders rest on a flat surface, next to each other. Both have a hole on the side at the bottom so that the water can flow from one cylinder to the other without leakage. The diameter of the first cylinder is D1=3 m, the...

What would happen if you surrounded a black hole with water?

Hello, I'm having a question regarding the sensors and the techniques in fluid mechanics. Since my skills are amazing in this field, here I'm asking you questions xD I want to measure the air pressure of this tube/pipe (P1,P2,P3). This pipe will be flushed with water and then with compressed...

Hello PF, I have a question. I would like to know how many gallons per hour are leaking from a residential hot water system. Here are the parameters: House PSI or H2O pressure=100 psi. Hot water pipe size=3/4” copper. Temperature of piping that is approx. 10’ away from the water...

Hi, For a book that I’m writing, i need to know how to describe the following, if the situation described is ever possible, otherwise I'll have to come up with another scenario. A surge of high voltage electricity at a gas-insulated switchgear creates a flashover whose Breaker Current Failure...

Homework Statement An ice cube of mass 0.01.kg at a temperature of 0 degrees Celsius is dropped into a cup containing 0.10kg of water at a temperature of 15 degrees Celsius. What is the max estimated change in temperature of the contents of the cup? SHC of water = 4200J per kg per kelvin...

Hey, this is my first time posting and I've been looking everywhere but can't find a decent water model. I hacked a program together to decently simulate water physics, but it's not nearly robust enough for what I need. So, in this world, everything is based on a grid. Any non-wall tile can...

Homework Statement Steam runs through a pipe, and the state of the steam is required to be found. To do this, some of the steam was condensed inside a container filled with water. The container weighs 850g, and has 8kg of liquid water inside it initially. The whole system was measured to be...

Homework Statement If the text is too small, it reads: 'A student measured the pH of water at various temperatures using a pH meter and obtained the following results: (table showing pH decreasing as temperature increases) The student was unsure whether the results were accurate or if the pH...

Hello, I am having a hard time deciding the size of a solar array to boil water for a school project. Before putting any thought into the subject I simply thought that I would just take the wattage of the panels and add them up since they are added in both series or parallel and then select an...

Giant standpipe type overflow from a dam. https://rumble.com/embed/vfzc9/

How does compression cool water in a household water cooler? I was reading and it says, " The water inside the water cooler is fed into a reservoir, where it is cooled using a refrigerant. A refrigerant is a cooling medium that is circulated in pipes that are located close to the reservoir in...

Homework Statement There is three things P, Q, R. The density of P is 2000 kg/m3, Q is 1000 kg/m3, R is 2500 kg/m3. If all of them are put into the water having density 1000 kg/m3, the correct position of the things are shown by following picture ... [PLAIN]http:// Homework Equations When ρ...

To what extent is quantum mechanics needed to explain the properties of water? Thanks in advance.

I'm going to make a water propelled pop bottle rocket for a competition. The bottle holds 1.5 liters and we are going to fill some amount of it with water and pressurize it to 75 psi. When triggered, water will come out of the hole in the cap and propel the rocket. The rocket is perfectly...

Why is ethanol less dense than water if ethanol has a larger molecular weight. I think i heard it's something to do with water molecules being closer to each other. Why is this?

I was watching a video explaining how microwave ovens work when I found that there is a difference between my physics textbook and online images of the electric dipole moment of the water molecule, as well as the one shown in the video. Why do they differ?

Hi everyone! If I have a sample that didn’t present conductivity and left a solid evaporation residue but its density is approximately 1 g/mL (1,08 g/mL), can I still say it is pure water? I suppose pure water shouldn’t have any kind of solid residue. Thanks!

Sorry if this question has already been asked but I didn't find it in this forum. Which is the acidity constant of water in itself? Ka of a weak acid HA in water dilute solution is defined considering the aequilibrium: HA + H2O ↔ H3O+ + A- (1) then: Ka(HA) = [H3O+]⋅[A-] / [HA] this, for...

Is the answer in my physics book wrong or did I miss something? Homework Statement A vessel whose walls are thermally insulated contains 2.40 kg of water and 0.450 kg of ice, all at 0.0°C. The outlet of a tube leading from a boiler in which water is boiling at atmospheric pressure is inserted...

Homework Statement A submarine engine provides maximum constant force ##F## to propel it through the water. Assume that the magnitude of the resistive drag force of the water experienced by the submarine is ##kv##, where ##k## is the drag coefficient and ##v## is the instantaneous speed of...

Homework Statement How many moles of electrons are in 1mL of H2O Homework Equations [/B] 1mL = 1g moles to grams conversion - moles x molar mass = grams mass of 1 electron = 9.109382 x 10-28g moles to molecules = number of moles x avogadro's number (6.022140857 × 1023) The Attempt at a...

I need to freeze a gallon of water in my dorm room mini fridge over night to prank my roommate. when turned up to the max, it will freeze water. but I'm wondering if placing ice or dry ice next to the jug would help it freeze faster over night. I'm worried the fridge would spend more energy...

Homework Statement : [/B]Find the change in internal energy of 2kg water as it is heated from 0°C to 4°C. The specific heat capacity of water is 4200J/Kg and its densities at 0°C and 4°C are 999.9 kg/m3 and 1000kg/m3 respectively. Atm pressure=105PaHomework Equations :ΔU= Q-W W=PΔV M/V=D[/B]The...

A conceptual problem related to a design I'm working on: If I use a pump to suck air out of the top of a vertical pipe, with the bottom of the pipe in water, I can only make the water rise around 10 metres inside the pipe, if I produce a perfect vacuum. Now let's say the pipe was 100m long and...

I am looking for 25 nm "cloth" (I'm using that term loosely) my goal is to create a cheaper water filter similar to "LifeSaver bottle" (https://en.wikipedia.org/wiki/LifeSaver_bottle) which is $139