Water Definition and 1000 Threads

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

Homework Statement I've been doing an experiment where I measure the water volume in a glass bottle as I manipulate the temperature from room temp (24.8 degrees celsius) to 0 degrees celsius, and then back up to room temp. I know that water behaves uniquely from 0 to 4 degrees celsius, it...

Homework Statement 13.43 A child slides down the helical water slide AB. The description of motion in cylindrical coordinates is ##R=4m##, ##θ=ω^2t^2## and ##z=h[1-(\frac {ω^2t^2} {π})]##, where h=3m and ω=0.75rad/s. Compute the magnitudes of the velocity vector and acceleration vector when...

Hello, I am working with an artist to build enclosures that would hold magnetite sculptures in water filled test tubes... and they are rusting. One of the specifications I was given is it has to be chemical free water, so that rules out oxygen scavengers. Seeing as it is the dissolved oxygen I...

Kia ora I'm a fist year engineering student in Christchurch NZ, and a few friend and I, are designing a simple engineering report for a water projection system for an organization called gap filler. Were currently thinking of projecting an image of music onto the river Avon so people can read...

Is there any difference in accuracy with using a resivoir vs just the tube? I want to acurately level the torque boxes on my car on jackstands so i can make frame measurements. Thanks

In reading Jules Verne's book A Journey to the Center of the Earth I came to a section where one of the characters questions if the massive weight of the air would be fatal at the center of the Earth. I lack the mathematical skills to derive an equation to graphically represent the results. My...

Homework Statement Two pans filled with water. Water in a 3.7cm deep pan is observed to boil at 98 degrees Celcius. At what temperature will the water in a 46.3cm deep pan boil? Homework Equations P=3.146T-211.87 (linear approximation) Water properties table: 95°C 84.609kPa .001060 vf 1.9808vg...

Hello, I was doing some research on enthalpy of water-ethanol mixtures at different ratios, and when looking at all the information graphed, I don't understand why it produces the trend line it does. Why doesn't it produce a 'quadratic' trend line? Shouldn't having a 10:90 water-ethanol exert...

Homework Statement This is more like a design problem, I'm to evaporate water at 20°C and 2000 psi(Tsat=335.472°C), I have the heat flux the water is going to absorb during heating, and If that flux remains constant during all the length then, how can I find the surface temperature for the...

Hi I am trying to do a transient heat transfer calculation. The water flowing through the pipe is laminar (1 m/s, id = 0.0127 m, Re_d = 0.01) transferring heat to the pipe via convection, then the pipe (od = 0.015875 m, l = 144 m) transfers heat to the ground again via conduction. I found this...

Homework Statement I was trying to validate a calculation I didusing ANSYS fluent, it's about a flow of water that enters a tube, the tube is 16m long and is being heated with a Heat Flux of q'=1077328,47 [W/m^2], now after the simulation runs and I check the results I find out that the steam...

I feel so stupid, intuitively, when we were having this discussion I wanted to say that the level stays the same but when we were discussing with the person beside us, my partner said it would fall because water expands when it freezes, so when it melts, there'll be less displacement, so the...

Ok, so i did a physics experiment a few days ago and now i have to do a write up. The question is does the volume of water in the calorimeter affect the efficiency of the immersion heater? Could someone pls explain to me what happens & y? My results showed that as you increase the volume, the...

When the water waves go through one wide slit (slit wider than wave length), there's no fringes, the water waves spread all over the sides, like in this pic: http://electron6.phys.utk.edu/light/images1-3/misc3b.jpg or in this pic...

I observed something which I've never seen before. We left the tap open and the water stream was flowing in a particular pattern. When we placed a beaker under the water stream, the pattern disappeared. And the pattern itself was oscillating. Here's the video link. Below the the photos of the...

Homework Statement Water is poured into a container that has a leak. The mass m of the water is given as a function of time t by m = 6.00t 0.8 - 2.75t + 22.00, with t 0, m in grams, and t in seconds. (a) At what time is the water mass greatest? (s) (b) What is that greatest mass? (g) (c) In...

Hi all, I've just moved to a house in the Highlands whose previous owner was American, and insisted on installing US appliances, presumably shipped over at great expense. I wonder if our US friends on here could help with the water heater: Is it just California state law to write all that...

Hi all, I'm thinking of buying a new water heater, and still confused to choose between storage water heater vs demand water heater (tankless). Can anybody give me the pros and cons of each? what I have so far: 1. Tankless consumes more power, and the longer you shower, the more it consumes...

Homework Statement A city with 30,000 residents lies next a lake which is their only source of water. The average family of four in this city uses 1100 liters of water per day. Neglecting rain and evaporation, how much depth would the lake lose per year if it covered 40 square kilometers...

Small towns in America frequently have water towers in which water is kept in huge tanks hundreds of feet high within water towers. I suppose that some sort of pump pumps the water entering the water tower to the tank at the top. I suppose that water pressure is maintain in these small towns...

Hi everyone I was reading about drag, and didn't quite find what I was looking for. A general drag equation is : 0,5 x ρ x u² x Cd x A, where there are some drag coefficients that have been found during laboratory experiments. Let's say a sphere with a radius of 1m is traveling at 2m/s under...

Homework Statement : See below paragraphs[/B] Homework Equations : I'm not sure on which equations I need.[/B] The Attempt at a Solution : I'm so sorry, this really isn't my strong point. Using the figures below, the tank surface is 113.184 sq in. The side pipe has a cross section area of 3.14...

If I have a starter culture, i.e dry yeast powder and mixed, that in a solution of water and sugar. Would it produce a healthy probiotic drink. That is the probiotic that was present in the yeast powder multiplied in the sugar solution. Generally such a probiotic drink is made from fruit...

Homework Statement A 0.530 kg sample of liquid water and a sample of ice are placed in a thermally insulated container. The container also contains a device that transfers energy as heat from the liquid water to the ice at a constant rate P, until thermal equilibrium is reached. The...

Homework Statement What is the molality of 1M NH4OH dissolved in 70.092ml of water? What is the total mass of the solution? What is the total volume? What is the concentration percent? What is the molar concentration? 1M NH4OH = 35.046g density of water = 1g/ml density of NH4OH = 0.88 g/ml...

At the outset I am a novice in physics. i have constructed a rain water storing tank with a capicity of 1,20,000 litres. I propose to seal the tank so that there is no light penetrating inside the tank. My question now is how do I measure how many feet of water is left inside the tank? Can...

The title says it all. I would like to know how to calculate the time for boiling water to cool off. Assuming the temperature of the room is not changing and there is a constant degree of air flow over the water. Really I would just like to know how to go about calculating this. Thanks in...

I am looking for a way that I can mix many colours of paint into the same container without it blending together and making other colours. I make liquid art and have seen others make images where i can see many colours in the liquid. The base of what I use at the moment is methycelluslose ...

Hi Please have a look on the attachment. Do you also agree that the shell strikes the water at the same speed? It seems false to me. The vertical and horizontal motion is independent of each other. When the shell is fired horizontally, it starts descending toward the ground from less height...

Homework Statement on a flat desk is an aquarium with a volume of 640 cm3 ,t's not full of water. The pressure to the bottom of the aquarium is 3 times bigger than to one side of it, how much water is in the tank? Homework Equations is the pressure, is the normal force, is the area of...

Homework Statement [/B] I am to design a 600mL water bottle by drawing one side (bottle lying horizontally). Three types of functions must be included (different orders). The cross-sectional view would be centred about the x-axis, and the y-axis would represent the radius of that particular...

Just to clarify, this is not a homework or coursework question. I was wondering, if you have a large container of salt water and place two electrodes on either side, the current will pass from one electrode to the other through the salt water medium. Is the a way to calulate or 3D model the...

Suppose I fell from a mountain, which would hurt less: A) Falling on a very huge pile of powder snow or B) Falling on water It's a serious questions! Thanks!

how to dissolve / good dispersion Fe3O4 nanoparticles in water and that solvent have with / without toxic to fishes?

I'd like to explore water pressure by having students build water towers out of both 2-liter bottles and thinner 1 liter bottles. 1. Assuming they build towers of the same height and fill them with the same type of water, we should see the same water pressure for identical heights within the...

Homework Statement Household water heaters use a 240 V rather than a 120 V source. What is the resistance of a water heater's heating element if it heats 40 gallons (151 kg) of water from 15 C to 60 C in 15 min Homework Equations P = IV P = I^2R I = dq/dt The Attempt at a Solution Honestly no...

This might be a silly question. Ever since I can remember, I've been taught that when light crosses the boundary between two mediums with different refractive indices, its trajectory changes due to a reduction or increase in its speed. I've never given this a second thought, but today I...

I was thinking of a hypothetical waste system that uses nanotechnology to its advantage. At the individual level, waste just passes through into pipes when flushed like it normally does. But once it reaches the water treatment plant there is an initial filter to catch solid waste(in other...

Homework Statement Homework EquationsThe Attempt at a Solution The water skier makes an angle of 20 deg with the axis of the boat. I do not understand how to get the other angles.

Imagine that we have a closed plastic bottle filled with water and then we punch a hole with area A in its cap. How can I find the initial velocity the water will he "fired" with if we squeeze the bottle applying stress S? Assume that we know all about the bottle (moduli, change in volume etc...

Ive observed my own plants for quite some time now, and of course done my studies on nutrition. What I've recently learned (observed) is that when a plant lacks water, the flowers seem to be the last ones standing, while possible death from other factors preserves older or newer leaves...

Hi guys, I know the difference between these two things but I'm struggling with something that I hope someone could help me with. What dictates the water pressure needed for a "system" to work? I would imagine that if you've calculated your system to have a pressure drop of 1 bar (for...

Hey everyone! My name is Jing and I am participating in a one month summer program called SHAD where 800 high school students across Canada come together to try and solve some of the world's most multi-dimensional problems. One of the aspects of this program is the Entrepreneurial Project, where...

I know that the two are different thing, that vdW appears in inert gas crystals and alike while hydrogen bond bonds molecules of water. My question is, how does the potential look for hydrogen bond? For vdWaals we have the two terms proportional to 1/R^6 that describes attraction and 1/R^12...

Bernoulli's equation gives us this as the flow rate from a pressurized tank: $$v = C_v \sqrt{2gh + \frac{p}{\rho}}$$ where ##C_v## is the velocity coefficient, ##g## is the acceleration due to gravity, ##h## is the height of the water above the exit hole, ##p## is the excess pressure above...

Hello everyone! I have seen several DIY projects which successfully gathered heavy water from normal water. For example Cody from codys lab used electrolysis to "enrich" the water. This however is a messy process. So i became curious, if this can be done easier by centrifugation. Based on...

Homework Statement Homework EquationsThe Attempt at a Solution [/B] Since wavelength of light reduces on entering water , then the wavelength of light entering the eyes of diver is less than the wavelength of green light . Out of the given options , option B) i.e blue color is the only one...

1. Homework Statement Homework EquationsThe Attempt at a Solution [/B] I know that if white light is incident on a triangular prism , then lights of different wavelengths are deviated by different amounts and dispersion occurs . But I am not sure what would happen in this case where we have a...

So recently I've become familiar with concepts like specific heat, and we use a formula Q=mcΔT to calculate the Joules necessary to heat up say a kg of water from 50 to 70 degrees celsius. Now I was wondering if there is a equation that incorporates the amount of heat lost to the atmosphere...