Ice Definition and 963 Threads

Homework Statement The problem and its solution are attached as TheProblemAndSolution.jpg. Homework Equations Vector addition. Cross product. The Attempt at a Solution Given that I am just supposed to take Fig. 1 for what it is based on the way the problem is phrased, my biggest...

I'm trying to find possible errors in this lab experiment that I did, and one question I am thinking about is "Does ice melt linearly?" I assumed that it does so in my calculations, but now I'm not so sure. I measured the mass of melted ice (water) over a period of time and assumed that it...

1. A slab of ice floats on a freshwater lake. What minimum volume must the slab have for a 45.0 kg woman to be able to stand on it without getting her feet wet? 2. Archimedes Principal as well as Newton's Second Law will be applied The Attempt at a Solution I know that the...

So the current estimate is that an ICE engine is about 20%. If we were able to increase the efficiency of a given engine, would that result in a proportional decrease in exhaust temperatures? (Given that driveline loss to friction is constant)

Does entropy decrease when stars are created from a dust? Does etropy decrease when water freezes?

Homework Statement Newt needs to melt some ice, so he fires a test projectile (0.025 kg) at 30.0 degrees C at a speed of 240 m/s into a large block of ice at 0 degrees C, in which it becomes embedded (comes to rest). Approximately what mass of ice melts? (i.e. ignore the heat lost by the...

I am running hot air through a copper tube that is inside a chest freezer. I would like to encase the copper tube in a coolant that will help cool the air in the tube and was wondering which of these 2 would work better, water mixed with antifreeze at a temperature of 0 degrees F, or Ice at 0...

(that's Fahrenheit of course) For that matter...0 degree F aluminum cubes doesn't cool a room temp liquid as much. frozen H2O cools liquid off much much much much faster and more (in total temp drop terms) than equal surface area "cubes" of aluminum, cooled to -20C. (I've done the...

Homework Statement Okay, so I am having difficulties with understanding the concepts around entropy, take this question: What is the total entropy change for 7 kg of ice melting from -5 C° to 5 C° in room at 5 C°. Homework Equations dS=dQ/T Q =mΔH m*c*ln(tfinal/tinitial) c_ice=2 c_water=4...

Ice as pipe insulation? OK so this is a problem me and some co-workers have been discussing. We have refrigeration pipelines that are about 15°F. It is very hot and humid here (assume about 90°F and 75% humidity) so condensation often forms on the pipes and freezes. Thinking of it as a pure...

Hello Forum, Consider a rigid disk that is rotating on a surface. If the surface is elastic but not symmetric, the rotating disk will eventually slow down. If the surface was perfectly and symmetrically elastic the object will continue to rotate (the front deformation of the surface would...

Calculate the pH of a 0.0253 M aq solution of a monoprotic acid. The Ka for the acid is 1.79 x 10-2 So a monoprotic acid will have the form HA --> H + A, correct? I 0.0253 0 0 C -x x x E (0.0253-x) x x EDIT: I just realized the...

I meant to put Clapeyron equation, auto correct had other ideas... Homework Statement The densities of ice and water are 0.917 g cmE-1 and 1.00 g cmE-1 respectively. The latent heat of fusion of ice is 333 J gE-1. Use this information to derive the slope dp/dT of the water-ice coexistence...

For acid-base equilibria problems, how do I know when I have to use an ICE chart, or when I can use the henderson-hasselbach equation?

How do you solve the following problem: You are in charge of keeping the drinks cold for a picnic. You have a styrofoam box that is filled with cola, water and you plan to put some 0° ice in it. Your task is to buy enough ice to put in the box at 6am so that the temperature stays at 0°C...

Consider a floating ice cube in a glass of water. I know that the weight of the ice cube is equal to the weight of the water displaced. This would mean that if the ice cube melted, the volume of water melted would be less than the volume of the ice cube, because ice has a lower density than...

I'm trying to understand entropy, because I have no clue what it is. Iv seen questions like this posted in other places on the web, but there seems to be a disagreement over the answer. Some people say it is the randomness and chaos of a system, and other people say it is how close it is to...

Homework Statement Four ice cubes at exactly 0 \ { }^{\circ} \text{C} with a total mass of 53.5 \ \text{g} are combined with 115 \ \text{g} of water at 75 \ { }^{\circ} \text{C} in an insulated container. If no heat is lost to the surroundings, what will be the final temperature of the...

Guys I'm weak in heat and kinetic theory, so I'm going to need extra guide and pointers from you guys to solve this and the coming questions. Thank you. Question: A pond of water at 0 degrees Celsius is freezing. The thickness of the ice layer is h and the top surface of the ice remains at a...

I've obtained an insulated plastic cooler box. I want to use this when sea fishing to store my catch and keep it chilled as cold as possible until I can get it home. I intend to load a quantity of ice cubes into the bottom of it and drop the caught fish on top of the ice. My question is - Should...

Hello, is it safe to store approximately 5-10 pounds of dry ice in a normal freezer, because my grandpa came to town today from his elk hunting trip, and he seems to think so. Please comment, because I know that dry ice can be dangerous if used improperly. The dry ice is currently being stored...

It is my belief that as a country we shall all be driving LNG (Liquefied Natural Gas), DI (direct injected), Turbocharged, Plasma ignited cars in the very near future. LNG because of the supply here in the US and the L part (rather than C-Compressed) for range and relative safety. DI...

How will the level of liqid change if ice melts in it? If its water then there is no change - i know this will happen but i don't understand it( intuitively ) Moving on to other liquids - like oil and mercury - what will happen to their levels? Please help me understand I actually did...

Throughout my time doing physics I have noticed that ice has a lower specific heat capacity than water. I don't understand why. To me it seems that the bonds between water molecules in a solid are stronger and hence require a greater deal of thermal energy to break. Hence, the PE of the...

i need some conceptual help for my final year project... what are the thermal properties of ice cream?? Specifically the thermal conductivity and latent heat and the relation of it's variation with temperature... i'll be adding a copy of my abstract for better understanding. oh and yeah I'm a...

Hi, Could someone please explain what happens when an ice cube is put into a glass of hot water? I'm talking about the phase change and how the water gets cold. Thanks!

Hello I'm tasked to evaluate the roof of a small power station situated beneath a rather high tower in an alpine landscape, by means of FEA. One requirement is that the roof shall endure chunks of ice falling on it. Problem is, I am stumped as how to find the loads. The Eurocode norms I am...

Well, I would like to know the interaction process of an x-ray photon with ice? Thanks in advance.

Homework Statement Homework Equations The Attempt at a Solution

Homework Statement How much heat is released when 250 g of water at 10 degrees celcius freezes into ice and cools to -10 degrees celcius?Homework Equations Q=mcΔtThe Attempt at a Solution q= (250g)(4186)(283-273)=1.046*10^4 J than q=(250g)(2090)(263-283)=-1.045*10^4 J when i subtract the...

is solid carbon dioxide(dry ice) soluble in water

Homework Statement The z com of the entire ice cream cone, the base being an inverted right circular cone, the top a hemisphere. Equal density throughout. Must solve using integrals and density relationship. Homework Equations The z com of the top hemisphere (ice cream) is equal to 3/8 R...

I'm having a little trouble understanding why water freezes on the top. Take this passage: We can use this unusual thermal expansion behavior of water to explain why a pond freezes slowly from the top down. When the atmospheric temperature drops from 7°Celsius to 6°Celsius, say, the water at...

Homework Statement The exact question is "how many kg of ice can you melt, assuming it is at the melting point, with 178,000 cal of heat" Homework Equations The Attempt at a Solution I can't give any other imformation. I have know idea where to even, start with solving this...

Homework Statement Two cups are filled to the same level with water. One of the two cups has ice cubes floating in it. When the ice cubes melt, which cup has the higher level of water? 1. Same for both 2. Cup with ice cubes 3. Cup without ice cubs Homework Equations The Attempt...

hello, does someone knows why there's a sharp transition between water and ice? from water to gas the transition is much longer... thanks.

Homework Statement Two ice skaters stand at rest in the center of an ice rink. When they push off one another, the 60 kg skater acquires a speed of .61 m/s. If the speed of the other skater is .8m/s what is this skater's mass? Homework Equations explosion- pi=pf The Attempt at a...

If you have an ice cube in a full glass of water when the ice cube melts will the water flow over, be the same, or decrease? My book says the answer is stay the same, but I can't figure out why. Ice was less dense than water which is why is floats. Using this equation: B = ρVg which when...

Homework Statement .019 Kg icecube @ unknown temperature (In deg C) Placed in 200 mL (.2 KG) water at 35 C. After melting, water is at 22.4 C. Find initial temperature of ice using conservation of energy. Homework Equations I've done the math a ton of times and keep getting -60 C...

physics ice breakers! Giving a presentation at the end of next week as part of my final year in undergrad physics. Can any1 suggest any good physics jokes to break the ice?! (except the one about spherical chickens in a vacuum!) (I actually have a joke that I would like to tell - that as...

Homework Statement A 58 kg woman and an 78 kg man stand 8.00 m apart on frictionless ice. How far from the woman is their CM? 4.6 m If each holds one end of a rope, and the man pulls on the rope so that he moves 2.6 m, how far from the woman will he be now? Use two significant figures in...

Do you see how the ice-cube is less transparent in the center in this image? http://p.lefux.com/61/20091013/A10470000C/Crystal-LED-Ice-Cube-1-Gallay.jpg This image doesn't capture exactly what I see in my cup but it gets my point across. Why is an ice cube less transparent in the...

Homework Statement I am running to school at 6m/s when I hit a patch of icy sidealk. The coefficient of friction between the ice and my shoes is 0.16. I wish to turn my 55kg frame to the left. What is the smallest turn I can make? v = 6 m/s μ = 0.16 m = 55 kg Homework Equations Fnet = mv^2/r...

Homework Statement So we are given an ice cube of unknown mass, and the goal is to determine the mass after putting it in the calorimeter. We know the initial mass of the warm water. Is this the only way to solve the ice mass? I looked it up and the purple font is my values. Please the...

Hello, I'm currently doing research into the various effects of exhaust gas recirculation for my dissertation at university, the engine being tested on is a naturally aspirated 4 stroke diesel Ford straight 4 (probably out of a transit or something of the sort). Last week I recorded cylinder...

The motivation: Hi, I am a bit of a space freak and I have been enthusiastic about this question for a while because there are lots of bodies in the solar system that are a few or many kilometers deep in ice. It occurred to me that if you landed your powerplant on this ice it could sink to some...

Homework Statement A glass containing water is initially of temperature 20oC. The mass of the glass is 100 g and of specific heat 0.16 cal/g-co and water is of mass 200g. If 5 cubes of ice each of mass 15g will be added to the glass of water, solve for (a) The temperature of the mixture. (b)...

It isn't easy to get back on all fours all by oneself. Luckily, as the video shows, rescue came at last.. http://www.dagbladet.no/2012/01/22/nyheter/dyr/innenriks/natur/dyrenes_nyheter/19900866/

SVP = saturated vapour pressure. I understand that the SVP over ice is less than that over water for temperatures less than 0C. I'm doing an exam question which asks 'what is the significance of this difference?'. My first guess is that in clouds with both ice and water present, this...

hi I am new here a query about heat transfer- there are layered walls with different conduction coefficient. the last layer is maintained at freezing point while the first is at room temperature my question is will the ice not melt at the last layer considering that its temperature is...