Ice Definition and 980 Threads

I read somewhere that ice and snow are almost black bodies but the reason wasn't given. But how can it be? Ice appears white...so it reflects most light incident on it, then how it can be even almost a black body? <:|

Homework Statement An American football game has been canceled because of bad weather in Cleveland, and two retired players are sliding like children on a frictionless ice-covered parking lot. William 'Refrigerator' Perry, mass 162 kg, is gliding to the right at 7.41 m/s, and Doug Flutie, mass...

Homework Statement While walking on ice, one should take small steps to avoid slipping. This is because smaller steps ensure a)larger friction b)smaller fiction c)larger normal force d)smaller normal force. The Attempt at a Solution I think that the answer should be a) or c) as both...

need help here~ i want to collect latest journal/paper about antarctica/ artic sea ice monitoring..i search through internet..but hardly to get them... :( any1 can help me??

Homework Statement An insulated Thermos contains 190 cm3 of hot coffee at 83.0°C. You put in a 18.0 g ice cube at its melting point to cool the coffee. By how many degrees (in Celsius) has your coffee cooled once the ice has melted and equilibrium is reached? Treat the coffee as though it were...

Hello all... Help... :confused: my teacher gave us this question and... no matter how I approach this question, I just can't solve it... The question asks... an ice block melts and slides down a plane of rough surface.. The mass of the ice block starts at 3 kg, and its mass...

Homework Statement In an insulated container, .50kg of steam at 140C is mixed with 2.0kg of ice, at -20C. What is the final temp inside the container if heat exchanges with the container are ignored? This is a multiple choice question and the answer is 60C. Homework Equations mC(Tf-Ti) Lf Lv...

You guys ever heard of these things? I had no idea. (No they're not hoaxes; they're completely natural.) Here it is in motion:

Homework Statement The density of solid water is approximately 920 kg m^-3 and that of liquid water is 1000 kg m^-3. Calculate the melting point of ice under a pressure of 6000 kPa. Homework Equations This is my problem. How do I approach this? I don't see any relevant equations in my...

Homework Statement Identical plates are placed close together on ice. A 0.742 kg rabbit that is initially sitting on the plate on the left jumps to the other plate and immediately back to the original plate. The rabbit leaves both plates with a horizontal component of velocity of magnitude...

Homework Statement A cubical block of ice is melting in such a way that each edge decreases steadily by 9.8 cm every hour. At what rate is its volume decreasing when each edge is 10 meters long? Homework Equations V(t) = (l(t))^3 m^3 l'(t) = 0.098 m/h The Attempt at a Solution...

Homework Statement A 45-Kg girl is standing on a 150-Kg plank. The plank, originally at rest, is free to slide on a frozen lake, which is a flat, frictionless surface. The girl begins to walk along the plank at a constant velocity of 1.50m/s to the right relative to the plank. a)What is her...

Homework Statement A thin sheet of ice with an area of 0.15m^2 on each side hangs from a roof. The ice is at 0C (Celsius) and the surrounding air is at 10C. The net rate at which radiant energy is transferred to the ice from the sunlight and from the surroundings is 20W; q=9.5W*m^-2*K^-1...

If I was turning in a circular motion in a car, then I hit a patch of ice making the road frictionless. Would my car just go straight? I always have a hard time on these intuitive questions.

1. On an ice rink, two skaters of equal mass grab hands and spin in a mutual circle once every 2.4 s. If we assume their arms are each 0.75 m long and their individual masses are 56.0 kg, how hard are they pulling on one another? (answer is F= __N) 2. I thought I should use the equation...

Homework Statement A 8.80-kg block of ice, released from rest at the top of a 1.03m--long frictionless ramp, slides downhill, reaching a speed of 2.81m/s at the bottom. need to find the angle between the ramp and horizontal, and what would be the speed of the ice at the bottom if the...

Hi, I'm not sure if this is in the right place, so sorry if it isn't. So basically, I need to figure out a hypothesis to find out the relationship between force (or pressure) and velocity when a wire moves through ice. I am having difficultly finding the right formula(s) to find the expected...

Alright, ASSIGNMENT it is required of me to to the physics part in a group project where the topic is "causes of global warming". my group has chosen methane clathrates or methane hydrates if you like (in the ocean, not on land). The way these work is that it is methane gas that is trapped in...

First of all, hi, and thanks ahead of time... I've been working on this homework for almost a week, even asked the teacher for help but still haven't been able to figure out what I've been doing wrong/missing. its online work so ill copy paste it Homework Statement (a) Two 32 g ice cubes...

\cdotHomework Statement A block of ice falls into a lake who's temperature is 00c. Half of a percent of it's mass melts. What is the minimum height the block falls from. Homework Equations The Latent heat of water:L=79.7[Cal/gr] Potential energy: EP=mgh The Attempt at a Solution the...

Homework Statement a 2kg of ice at -2 deg celsius is mixed with 1.7kg of water at 27 deg celsius Homework Equations 1. will all the ice melt in water? 2. if all the ice melted in water determine the resulting temperature of the mixture, if not determine the amount of ice that does...

Homework Statement Two skaters on a frictionless pond push apart from one another. One skater has mass M much greater than the mass m of the second skater. After some time the two skaters are a distance d apart. How far has the lighter moved from original position. The answer is somehow...

PLEASE HELP ME TO ANSWER THIS QUESTION I AM STUCK An ice cube of 75 g is drop into a glass containing 330 g of water at a temperature of 22 ' Celsius. The ice is at 0 ' Celsius and melts so that the temperature of the water decreases. Calculate the final temperature of the water when all...

Homework Statement A piece of ice at-10 centigrade is heated to -1 C using a certain quantity of energy. Then another 20 times as much energy is necessary to finally obtain water. Using that the specific heat of ice is half of the specific heat of 4.2 kJ/(kg oC) of water, determine the heat...

Homework Statement A 55.5 kg ice skater is moving at 4.02 m/s when she grabs the loose end of a rope, the opposite end of which is tied to a pole. She then moves in a circle of radius 0.807 m around the pole. (a) Determine the force exerted by the horizontal rope on her arms. (b) Compare this...

Hello every one I hope I'm in the right place to ask this question :) well , have you heared about Dr. Emoto's ? http://www.is-masaru-emoto-for-real.com/" my friend were in US last year , and she was joining some one who provides her by these info. when she told me , it was my 1st...

"Ben and Jerry's 'Boston Creme Pie" Ice Cream" Appreciation Thread Truly amazing stuff going on in that container. those who know, know. I only hope to one day truly understand the science behind why this is so delicious. until then, i shall enjoy and appreciate it. - may scientific...

I would like to know if anyone else has seen this (photo below). I put a tray of purified water in my freezer and by the time it had half-way frozen, inch long ice shards at about a 45° angle had formed, grown right up out of the surface of the water. Can anyone point me to an explanation of...

In bomb calorimeter, when dry ice is added to warm water, the final mass of the inner cup and remaining water is less than the initial mass of the inner cup and water. The calorimeter did not decrease in mass so it means water is lost but not gone it just changes it state. The water was in...

Might one place a telescope in Mars orbit, in order to obtain 6" to 1 ft resolution, looking for closeup geological views; such as mars' stromatolytic fossils, or mars' ice (rock) on the surface, in form of a smooth surface that seems a bit odd? Might billions year old Mars' ice be opaque to...

Might ancient mid-latitude Mar's ice be covalently bonded? Would 1-2 billion year old ice have much greater density then, compared to Earth ice? So drilling into Mars' ice, compared to drilling into Earth ice, and measure relative difference in voltage/ampere as a proxy for relative density...

Might ancient mid-latitude Mar's ice be covalently bonded? Would 1-2 billion year old ice have much greater density then, compared to Earth ice? So drilling into Mars' ice, compared to drilling into Earth ice, and measuring relative difference in voltage/ampere as a proxy for relative density...

Homework Statement (a) An insulated copper container of mass 0.250 kg contains 0.350 kg water. Both the container and the water are initially at 25.0 0C. Then 0.012 kg of ice at 0.0 0C is added to the container. Eventually the container and contents reach thermal equilibrium at 21.7 0C...

If you come in contact with any object, it is not going to resist your movement right, why doesn't ice do this much. What chemical property is responsible for this?When I slide in ice, am I coming into less contact with ice, I don't understand. Thanks :smile:

Q. 1. if a ice cube is placed in a container containing liq on which it is floating. then is it possible that after ice melts, water level rises in vessel in any particular case. 2.Does heat evolves when water rises in a capillary. and how much heat is evolved in height of liq in capillary...

Why do ice skaters bend at an angle when taking a turn at high speed? I saw some pictures of ice skaters leaning while taking turn...in case of motorcyclists it is due to gyro effect but what in this case?

Homework Statement A toy manufacturer wants to create a toy ice cream cone by fitting a sphere of radius 4 cm inside a cone with a height of 8 cm and radius of the base of 3 cm. The base of the cone is concave, but the rest of the cone is solid plastic so that with the sphere attached...

Homework Statement A 100 g puck is attached by a length of string to a 500 g block of ice. The string passes through a hole in the centre of a horizontal, frictionless table, and, because it is revolving in a circle of radius 20 cm, the puck is able to support the ice. (Refer to attachment...

I have a que. if a ice cube is placed in a container containing liq on which it is floating. then is it possible that after ice melts, water level rises in vessel in any particular case. Does heat evolves when water rises in a capillary. and how much heat is evolved in height of liq in...

Homework Statement How much heat must be removed when 130 g of steam at 145°C is cooled and frozen into 130 g of ice at 0°C. (Take the specific heat of steam to be 2.01 kJ/kg·K.) Answer is in kcal. Homework Equations The Attempt at a Solution I know steam turns back into...

In my book for all these equilibria questions involving ice tables when I end up with Ka = \frac{(x)(x)}{initial amount - x} they always say that if the Ka is tiny compared to the initial amounts then we can assume x will be too and we can omit as many x's as we like from this equation. This...

http://www.sciencenews.org/view/generic/id/48174/title/Ice_confirmed_on_an_asteroid Ice was discovered covering the entire surface of one of the largest asteroids in the asteroid belt. However, the most fascinating part to me is this: "At the asteroid’s average distance from the sun — 3.2...

Homework Statement How much energy must be removed from a 4.50 cm x 4.30cm x 6.20cm block of ice to cool it from 0C to -31.0C? The density of ice is 920 kg/m^3. You might need to refer to the textbook for other physical constants of ice.Homework Equations Q = Mc(T_f-T_i) heat energy =...

Homework Statement An ice cube of volume 12.1 cm3 is initially at a temperature of -18.1°C. How much heat is required to convert this ice cube into steam? (the final answer must be in Joules) Homework Equations Q = m*c*deltaT Q = m*Lf (latent heat of fusion) Q = m*Lv (latent heat of...

Homework Statement A 45 kg figure skater is spinning on the toes of her skates at 1.0 rev/s. Her arms are outstretched as far as they will go. In this orientation, the skater can be modeled as a cylindrical torso (40 kg, 20 cm average diameter, 160 cm tall) plus two rod-like arms (2.5 kg each...

When do you use an unknown (x) as the change in the concentration of the entities and when do you simply subtract the concentration of the limiting reagent from the initial concentration of the reactants? @.@ Thanks!

Why does the salt melt the ice , and if i put a soda in a cooler then put ice on it and then put salt on it , it will start to melt the ice and then cool the soda faster then with just ice alone , is it correct to say that the melting of the ice requires heat , and it pulls the heat from the...

Homework Statement How many grams of ice at 0°C could be melted by the heat produced when 10.0g of ethanol is burned?Homework Equations So I wrote out the combustion reaction: C2H5OH +3O2 ---> 2CO2 + 3H2OThe Attempt at a Solution First I though I had to find heat of formation for that...

What happens? [PLAIN]http://img15.imageshack.us/img15/5575/1271475630826.jpg

Homework Statement A block of ice at 0C is added to a 150g aluminum calorimeter cup which holds 210g of water at 12C. If all but 2.0 g of ice melt, what was the original mass of the block of ice Homework Equations heat gained by ice = heat lost by water + heat lost by calorimeter...