Ice Definition and 963 Threads

I did a lab experiment were we measured the latent heat of fusion of ice but I am not quite sure what that is. I read that latent heat of fusion is the energy(heat) it takes to change liquid to solid. Is that true? Why would it take heat to freeze something?

Does anyone else believe that we are not going through global warming but actually and ice age?

Homework Statement The question is: a 6 pack of cola cans contains m grams of liquid. you want to put ice into a perfectly insulated box to cool it down from Ts to Tf. The ice initially has temp Ti. So (a)how much ice would you need as a minimum. (ignore presence of cans and final state of...

There is a surprisingly strong amount of evidence to support this idea. http://www.cenpat.edu.ar/diversidad/PDFsRolo/12-Neves%20et%20al.%202004.pdf. I've just read an amazing book linked to this speculation, see attachments. The only given theory as to how they could have made it is by boat. I...

When you take bottle of glass and fill it with some ice what happens to watersurface when ice has melted away? Does it rise surface? Or will it remain the same? Teacher spoke and demonstrated that and it didn't rise the surface. I believe in my eyes but is there any physical way to prove that...

Hexagonal ice?? Has anyone ever modeled hexagonal ice Ih using c++ before?? Or has anyone got any tips on how to visualize the structure?

http://arxiv.org/abs/0902.3446 So apparently gamma rays from nearby supernovae produce nitrogen oxide in the atmosphere. The team took 122-meter-long cores from Dome Fuji station in Antarctica and found three nitrogen oxide spikes in the 11th century. They think they know what two of them are...

http://www.sciencedaily.com/releases/2009/02/090216092824.htm Quote. The Younger Dryas event, which began approximately 12,900 years ago, was a period of rapid cooling in the Northern Hemisphere, driven by large-scale reorganizations of patterns of atmospheric and oceanic circulation...

There is a lot of speculation about why the Earth has not entered into a new ice age, following on from the pattern of glacial cycles recorded in the polar ice cores. It is a possibility that the Earth's tilt towards the Sun actually increased in the recent past. I know this sounds slightly...

[b]1. I need to find the latent heat of fusion of ice. The problem scenario is that i have a cup and fill it 1/3 full with water. I then take a cube of ice and put it in the cup. then the cube of ice melts mass of the cup=.24g mass of the cup when filled 1/3 with water=71.16g initial...

Hoping someone could double-check for me... Homework Statement 1) A 90 g block of unknown metal is heated to 86 degrees C and put in an insulated cup with 175 g water at 23 degrees C. At equilibrium, they are both 25.8 degrees C. What is the specific heat of the metal block? 2) A well...

Find the difference in entropy between a cup of water and a cup of ice for each of these cases: 1. both are at T=0C 2. ice is at T=0C water is at 20C ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ If the "water" is at 0C then it is ice right? and the difference in entropy is 0 correct? For the...

Homework Statement A tank of water has been outdoors in cold weather, and a slab of ice 5 cm thick has formed on its surface. The air above the ice is -10C. Calculate the rate of ice formation ( in cm / h) on the ice slab. Take the thermal conductivity of ice to be 0.004 cal / (s.cm.C) and...

I'm not familiar with Earth science, in particular ice formation in glaciers and I hope you can bear my rather stupid question: Is the change of a "normal" ice layer into glacial ice with frozen air bubbles a continuous transition or a spontaneous reaction? Someone told me that the air...

When salt is added to a ice water solution it makes the ice melt at a colder temperture than zero degrees C. I'm told because it weakens the bonds that hold the ice together. Is the latent heat asorbed by the melting ice at the new lower temperture the same as if the salt was not added and...

I want to start with several assumptions: 1. I have one gallon of water at 32.1 degrees F 2. It is correct that in order to lower the temperature of one gallon of water 1 degree F, approximately 8.34 BTU's of heat energy must be removed from that water. 3. Latent heat of fusion requires...

Homework Statement How much energy is required to change a 40.0 g ice cube from ice at -8.0°C to steam at 108°C? Homework Equations q=mct The Attempt at a Solution i remember one of our TAs going over something like this a long time ago..I think i have to like add up all the...

Multiple evidence suggest that the Pleistocene epoch (2.56 Million years - 11.6 thousand years) was about waxing and waning Ice sheets with the pace of the milankovitch wobbles superimposed on the Earth orbit. One intriguing element showing this is a multiple multi-millenium cycle in...

Homework Statement The density of ice is 0·92×103 kg m−3 and its latent heat of fusion is 3·3×105 J kg−1. Estimate the melting temperature of the ice at the bottom of a glacier which is 100m deep. Homework Equations L = Tc(S2 - S1) The Attempt at a Solution (S2 - S1) = 1208.8 I then...

Homework Statement A closed rigid vessel contains 0.1 kg of water vapor (steam) at 1 bar and 200 C. The vessel is plunged into a bath containing water and ice. After the vessel cools and reaches equilibrium with the bath, the bath still contains water and ice. a. What is the volume...

Hi, I live in the northeast, well known for its heavy snowfall in the winter. Where I live, for the past few days, it has been raining heavily during the daytime and stopped at night. This has collected in various ducts and pipes meant to remove the water from the roof. At night, when the...

So we need a new picture and the weather is freezing fog. Hence rime ice time. The bigger waters are still open, the fog is more intense there, the place to go for new rime ice pictures. 100% crop 100% crop Now, which one to enter in the contest?

Why don't ice cubes spontaneously form in a cup of water? Someone was explaining to me that for ice cubes to spontaneously form, the water molecules would have to go to a more ordered state. I know about the spontaneous symmetry breaking that occurs when water is at 0'C, but I was wondering if...

Homework Statement A pure ice cube sits in water, floating. Prove that the water level will not change after the ice cube melts (meaning, the volume displaced by the cube will equal the volume of water added once the cube is melted). density of water = 1000 kg / m^3 density of ice = 920...

I've read that if and when the Antarctic icecap melts off, the land will rise up due to having a very massive amount of ice melt off. This sounds like it could effect the tectonic plates and the bedrock. Is this land upheaval apt to cause Earth quakes and maybe even volcanism?

Homework Statement A cube of ice floats partly in water and partly in kerosene oil. Find the ratio of the volume of ice immersed in water to that in kerosene oil. Specific gravity of kerosene oil is 0.8 and that of ice is 0.9 Homework Equations Upthrust = V(imm)*d*g The Attempt at a...

Homework Statement How long does it take the Sun to melt a block of ice at 0 celcius with a flat horizontal area 1.0 m^2 and thickness 1.0 cm ? Assume that the Sun's rays make an angle of 30 with the vertical and that the emissivity of ice is 0.050. Homework Equations delta [Q] /...

1)Calculate the heat needed to change 2kg of ice at 0 degrees C to steam at 100 degrees C. The attempt at a solution 2x334000=66800J 2x4200x100=840000J 2x2260000=4520000J total=5426800J should be 6120000J somehow 2)An electric kettle produces 3000J of heat every second.It is filled...

Homework Statement steam at 100C is added to ice at 0C find the amount of ice melted and the final temperature when the mass of steam is 10g and the mass of ice is 50g Homework Equations Q=mcdT Q=ML The Attempt at a Solution Qmelt=MiciT+MiLf =0.05(2090)(100C)+(0.05)(3.33x10^5)...

A friend of mine told me a while ago about this article he read ~50 years ago about some prisoners being blindfolded, told they were going to be cut with a razor, and having an ice cube rubbed on them. Apparently it felt like a razor and because of "mind over matter" the prisoners actually got...

Hi everyone! My first post, so bear with me. I have a query that I didn't quite know who to ask about, and came across this site, so I hope this is the right place to put it. My cat's bowl was left (empty) on the verandah and got caught in the rain yesterday afternoon. Overnight...

Homework Statement A 0.170 kg puck rests on frictionless ice. Two hockey players strike the puck simultaneously. #1 force is 350. N exerted at 020.0T, and the other #2 force is 600. N exerted at 065.0T. What is the magnitude and direction of the puck's acceleration at the instant that it is...

Homework Statement A 35 kg ice skater traveling at 12 m/s runs head-on into a 65 kg skater traveling straight forward at 4 m/s. At what speed do the ice skaters travel if they move (stuck) together after the collision?Homework Equations i put it below. i don't know if youre supposed to use...

Homework Statement A layer of ice having parallel sides floats on water. If light is incident on the upper surface of the ice at an angle of incidence of 15.0°, what is the angle of refraction in the water? Homework Equations The Attempt at a Solution i know its not so simple that...

1. The diagram shows a strip of paper tape that has been pulled under a vibrating arm by an object moving at constant speed. The arm is vibrating regularly, making 50 dots per second. What was the speed of the object? A. 2.0cm/s B. 5.0cm/s C. 100cm/s D. 200cm/s Completely clueless...

If so, wasn't it confirmed when we saw an increase in ice levels at the poles this year?

Homework Statement A 60Kg ice skater, at rest on frictionaless lce, tosses a 12kg snowball with velocity given by v= 3.0i + 4.0j m/s, where the x and y axes are both in the horizontal plane. What is the subsequent belocity of the skater? Homework Equations p=mv The Attempt at a...

On a cold winter morning, a child sits on a sled resting on smooth ice. When the 9.10 kg sled is pulled with a horizontal force of 37.0 N, it begins to move with an acceleration of 2.50 m/s^2.The 23.0 kg child accelerates too, but with a smaller acceleration than that of the sled. Thus, the...

Hello, As I'm seeing the center of mass at university, many questions came to me but I could solve most of them. However I'm not sure about some points. Say you have the system a human on ice. (without air. And consider the ice to be frictionless with the human). I could hardly understand...

[SIZE="5"][FONT="Arial Black"]SOLVED Homework Statement A plate of of Mass m contains an ice cube of mass M and side L. Find the shift in centre of mass when th ice melts. (Gravity absent) The Attempt at a Solution I think that the centre of mass will come down by ML/2(M+m) But my book gives it...

Homework Statement This is from Fundamentals of Physics 8th ed, by Halliday and Resnick: A boy is initially seated on the top of a hemispherical ice mound of radius R = 13.8m. He begins to slide down the ice, with a negligible initial speed. Approximate the ice as being frictionless. At what...

I'm looking at different topics for my masters thesis and one of them that has a lot of potential is a heat transfer model for a piston in an internal combustion engine. Apparently the auto industry has never directly addressed this problem and use a trial and error method when it comes to...

The densities of ice and water at 0*C are 0.9168 and 0.9998g/cm3. The latent heat of ice is 80cal/g. What is "delta"H and "delta"U (enthalpy and internal energy, respectively) when 1kg of ice is melted? I'm really confused on which formulas to use and if the densities are even relevant to this...

The question is: Ice at 0 degree C turns into Water at 0 degree C and thus gains 1 Kg of mass. What is the original mass of ice?

A 1.6 -long, 550 rope pulls a 9.0 block of ice across a horizontal, frictionless surface. The block accelerates at 1.0 . 1) How much force pulls forward on the block of ice? 2) How much force pulls forward on the rope?

I've noticed that when I pour myself a glass of ice water the ice cubes will stick together. I put them in my glass as individual cubes, and they seem to melt together where they touch each other. Can anyone explain why this happens? Thanks.

Greetings, I was curious to know if ice evaporates. I suspect it does to a very slight degree but to what degree I am not sure. It likely depends on a plethora of factors, from ice temperature, outside temperature, humidity, sunlight, wind, etc. So if you have any leads for me I'd appreciate...

Heard on the radio that the aircraft that crash landed at London airport crashed because of ice in the fuel (or that is the best guess) surly this is a cop out.

Can a wind propelled ice boat have a speed higher than the speed of the wind it is propelled by?? The answer, as i have come to know is "yes" ... but i need a proper explanation... hope that someone can help me out ! thanks in advance!

i need some help guys. see, i was doing my school-based assessment labs probably two months ago and as i was going to write up the report I lost my procedure of how to do the experiment. In the one I did, we didn't use any calorimeter like how they describe it when you google the experiment...