Ice Definition and 963 Threads

Hi. I've forgotten some of my basic physics so maybe someone can point me in the right direction. I want to hook up my hand crank ice cream maker to a bicycle. I'm thinking I would have a total of about 5 gears so that I can spread out the work required to crank the ice cream. (I want to crank...

In an experiment plastic bottles of supercooled water were agitated causing visible amounts of ice to form (the water/ice mixture was filtered into a measuring cup, not a large fraction of ice formed). Why did the agitation ("not a lot needed") set off ice formation? Is it the large scale...

Hello all! It has been some time since I've posted, but I have enjoyed several of the threads I've been following... Anyway, I have a situation with ice, and I'm a comp-sci graduate from way back, not a physics person (wish I was), so I'm looking for help from someone more knowledgeable...

Homework Statement Suppose that Earth's polar ice caps melted and the water returned to the oceans, so that the oceans were deeper by about 25.7 m. What effect would this have on Earth's rotation? Make an estimate of the resulting change in the length of the day. Homework Equations w=(2pi/T)...

Homework Statement Question requires assumption that the Earth is spherical, all the ice is located at the axis of rotation. Basically if all the ice was to melt uniformally over the surface of the earth, what would be the change in the length of the day? Mass of ice: m= 2.3*10^19 kg Mass of...

An often encountered but incorrect answer would be that the pressure on the ice lowers its melting point. This doesn't make much sense since this effect can only lower the melting point of ice by a very small amount 1C by a simple calculation in thermal dynamics. So the question is, what...

1. A boy is seated on the top of a hemispherical mound of ice with radius R. He is given a very small push and starts sliding down the ice. At what height does he leave the ice if the ice is frictionless? 2. Conservation of Mechanical Energy: U1 + K1 = U2 + K2; also gravitational energy...

Homework Statement an ice cube is melted in water which is continuously stirred to be at a constant temperature of 0 degrees. the stirring is gentle enough so the work done is negligible. my question is why in this case does the heat come from the air to melt the ice cube and not the...

Homework Statement One liter of water at 30 C ( 30000 calories ) 100 gram (100 cc ) sphere of ice at 0 C is in center of water volume. The ice will absorb 8000 cal melting and final water temp = 22000 cal/ 1100 g = 20 C Assuming mixing and uniform water temp during melting ,and vessel is...

Homework Statement Derive an expression for equilibrium concentrations in terms of formality f (and Keq) for the compounds in the the equilibrium reactions shown bellow. Homework Equations A2 + 2S <---> 2SA SA <---> S + A Where S is a substrate (THF) and A is an adduct (BH3)...

Hi!,If someone could help me. I need to show on a graph (line) the change of state of 1 lb of ice, to water. From -35 degrees F to 50 degrees F showing the BTU's required to do so. And where the latent heat and sensible heat come into the graph. I hope someone understands what I'm saying and can...

I have read a few times that comets are significant transports of ice (perhaps in having supplied water to fill Earth's oceans). That implies that water is more abundant in the few comets (in accumulated mass) that have impacted Earth than that which would have existed within the initial planet...

I have a kettle of aluminum with the mass of 1,10kg. There's 1,15kg of water in it, with the temperature of 20,2 C. The water is cooled with ice cubes. 150g of ice with a temperature of -25 C are poured in. What is the final temperature? I'm relatively new to physics, and I haven't solved...

Homework Statement Hot water is mixed with an amount of ice having an equal mass to that of the water and an initial temperature of 0 °C. The specific heat capacity of water is 4.2 kJ/(kg K) and the specific latent heat of fusion for ice is 334 kJ/kg. Assume that no heat is lost to the...

Homework Statement The ice piece of 380 g was taken from the deep-freezer, temperature was -9,6 °C, and well insulated container to the being stone-cold ( 0 °C) water. Inside the Ice piece was small temperature detector. When temperature of the the ice piece had balanced 0 °C. part of the...

If we melt ice at 0'C to water at 0C, what is the change in the internal energy of the ice-water system? As per the first law of thermodynamics, ΔU = ΔQ +ΔW where they are increase in internal energy, heat flow to the system and work done on the system respectively. If we melt ice at 0C, we...

Hi, I was just wondering if anyone could shed some light on how this ice spike formed? All I did was fill a 4" tall, 4" diameter plastic container with water and put it in a normal refridgerator freezer. I came back the next morning and found what you see in the photos. I likely used...

Hi everyone I need your help in the following problem: Some dry ice (solid carbon dioxide) at -78oC is placed in a steel jar, which is subsequently sealed. The jar is immersed in a large beaker of water at room temperature until the dry ice has completely vaporized. If the measured energy...

Homework Statement 5kg of ice falls away from the edge of the roof of a block of flats, at a height of 26m above the ground. Homework Equations ignoring the air drag, find out: a) how long it takes for the ice block to hit the ground. b) what is the speed at which the ice block hits the...

Homework Statement Man with mass M pulling with constant horizontal force F along a rope attached to object with mass m. Both the man and the object are on a frictionless surface and separated by distance D. When the man and object meet, what is the velocity of the object? Velocity of the man...

Homework Statement a 500 g lead mass is heated to 150 C and placed on a block of ice at -10 C. how much ice, if any will melt? 52 kg = block of ice Homework Equations The Attempt at a Solution i didint know where to start so i did qmcdeltaT + qmcdeltaT = 0, and i failed at it i...

What happens to the level of water in a beaker when a block of ice floating in it, melts? Does it go up, down or remains same? What is the reason?

Urgent! Acceleration of an ice block given mass Homework Statement A 42 kg block of ice slides down a slope of 30 degrees. Assuming friction is negligible, what is the acceleration of the block down the incline? Homework Equations Fnet=max W=mg The Attempt at a Solution I have...

Does anybody know how this works? https://www.youtube.com/watch?v=aLwaPP9cxT4

Homework Statement A student wants to melt a 200 gram block of ice that is at minus 10.0°C and turn it into liquid water at 15.0°C. The student plans to do this by heating copper pellets to 100.0°C and then dropping them onto the block of ice in a thermally insulated container. How many...

We did a calorimeter experiment in my school however the teacher warned us that the latent heat of fusion of ice value will be different from the standard value because the ice has water in it and because the ice melts little before actually doing the experiment. However my question is which way...

Homework Statement A HOCKEYPLAYER SKATES AT 7.85 M/S AND HAS A MASS OF 120 KG WHEN HE COLLIDES WITH ANOTHER STAIONARY HOCKEY PLAYER. THE SECOND HOCKEY PLAYER IS NOW MOVING AT 5.67 M/S. FIND THE MASS OF THE SECOND HOCKEY PLAYER AND THE SPEED OF THE FIRST. ASSUME THIS COLLISION IS ELASTIC...

So, my friends and I build ice forts each year (well, not last year... not enough snow). Each year they get a little more ambitious as we apply our previously learned trade-skills to the next generation. I thought I would share a bit here; we just started work on the third generation over this...

Homework Statement How much energy is required to change a 35 g ice cube from ice at −15 C to steam at 117 C? The specific heat of ice is 2090 J/kg * C, the specific heat of water is 4186 J/kg * C, the specific heat of stream is 2010 J/kg * C, the heat of fusion is 3.33 × 10^5 J/kg, and the heat...

Hi I am curious to know if anyone can provide a formula/answer to the affect of a thin layer of ice may have on heat loss in water flowing in a pipe. Example. I have a smooth plastic pipe approx 20mm diameter, 5m length. 400ml of water travels down the pipe, approximately 0.5m/s. in -10C...

The problem: On a hot summer day, you decide to make some iced tea. First, you brew 1.50 L of hot tea and leave it to steep until it has reached a temperature of T_tea = 75.0 C. You then add 0.975 kg of ice taken from the freezer at a temperature of T_ice = 0 C. By the time the mix reaches...

Homework Statement Ice has formed on a shallow pond, and a steady state has been reached, with the air above the ice at -9.6°C and the bottom of the pond at 5.5°C. If the total depth of ice + water is 2.1 m, how thick is the ice? (Assume that the thermal conductivities of ice and water are...

Homework Statement Find mi, the initial mass of ice. Ti = -20 ci = 2093Jkg-1K-1 Ts = +35 ms = 2kg cs = 837.4Jkg-1K-1 cw = 4187Jkg-1K-1 lf = 3.35x105Jkg-1 S = solid W = water I = ice lf = latent heat of fusion of ice / waterHomework Equations Q=mc\DeltaT Q=C\DeltaT Q=mlThe Attempt at a...

Homework Statement Hi, I've been given the following information to manipulate the results of my last physics practical: Mass Of Water * Specific Heat Capacity of Water * Change in Temperature of Water = Latent Heat of Ice * Mass of Ice + Mass of Ice * Specific Heat Capacity of Water *...

Brian Cox on Wonders of the Solar System (episode: Order Out of Chaos) on the Science Channel says the rings of Saturn are made up of chunks of water ice. Water ice? In space? I would expect a chunk of water ice in space would experience a near zero vapor pressure. Wouldn't it? And if...

Like, even if it is ice cold already, it still seems to taste better with ice. I'm guessing it's just a psychological thing?

i was just reading an article i got linked to from google, about the North magnetic poles location is moving towards siberia currently at about 45k per year, which has increased over the past 100 years from around 15k per year, it was explained that it was possibly caused by density variations...

Can anybody explain how this inverted icicle could have come to be formed ? This mug of water had been sitting outside for a few days, last night the temperature in Edinburgh dropped to below zero, and this morning I saw that this ice stalagmite had formed. There was no source of dripping...

Not sure if the title does this question justice. My question how much energy in KWHs or a fraction thereof, could be saved in refrigerator operation if someone took a gallon of water, let it freeze solid outside during a 0F degree night, then placed it in their refrigerator until it thawed to...

Homework Statement One kg of steam at 100 degrees Celsius is added to 1 kg of ice at 0 degrees Celsius. What is the composition and temperature of the resulting mixture. The heat of fusion for water is 79.7 kcal/kg, the heat of vaporization is 539 kcal/kg, and specific heats of ice and water...

A tub of icy water at 0 degrees C hold 100 gallons. You put a 25 pound watermelon with a temperature of 29.4 degrees C. The tub is wrapped in blankets to avoid heat loss. What will be the final temperature of the watermelon, considering that a watermelon is mostly water?

1. a)Homework Statement What is the buyant force on 0.90kg of a block of ice floating on liquid water? B) What is the buyant force on 0.90kg of ice held completely submerged under water? Homework Equations Fbuy+mg=0 Fb=mg The Attempt at a SolutionFb=.90kg * 9.18m/s^2=8.8 so i...

Homework Statement Steel object is pulling uniformly through the ice with applied force 2 Newtons. Find object's weight (P), if k of friction is 0.02 Homework Equations F = 2 Newtons k = 0.02 P - ? F = m*a P = m*g The Attempt at a Solution I drow all forces and made this: ma =...

Homework Statement A 53.5 g ice cube, initially at 0°C, is dropped into a Styrofoam cup containing 369 g of water, initially at 21.4°C. What is the final temperature of the water, if no heat is transferred to the Styrofoam or the surroundings? Homework Equations Lf*m + Mc Delta T = MC Delta...

Homework Statement Suppose you have a 24 ounce mug of soda (treat as water) at room temperature, which is 22 C. Warm soda tastes bad, so you add 125 g of ice at -25 C to the soda. What is the temperature (in C) of the soda once all the ice melts and the solution reaches a uniform temperature...

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...