Ice Definition and 980 Threads

Homework Statement Homework Equations equation with each part. The Attempt at a Solution I did part a) b) and c) on my own: Part d: I am having trouble at this part. I understand how to draw the heat curve but I am confused on what numbers I should use for the x-axis of the graph. I...

I found this clip on youtube of a plane getting pushed on ice due to strong winds. Have a look. I guess I just want to hear some comments about what is reallly going on here. How we can estimate the force of the wind pushing, what chance the ramp agent has of holding the place himself if say...

Natural convection always occurs opposite of gravity due to buoyancy; but I am confused as ice is solid so how could possibly convection even contribute to the heat transfer. I doubt about air movements nearby block that may contribute to greater heat transfer rate in case of hot block placed...

Homework Statement Homework EquationsThe Attempt at a Solution There is no tangential acceleration , only normal acceleration ,given by ν2/R .But I do not understand what is the radius of the curve since rat is moving along straight line before and after the turn (I think that is the case...

Homework Statement 5 g of water at 30°C and 5 g of ice at -20°C are mixed together in a calorimeter Find the final temperature of the mixture. Water equivalent of the calorimeter is negligible,specific heat of ice=0.5 cal/g°C and latent heat of ice =80 cal/g. Homework Equations...

Homework Statement A 3.20 g lead bullet at 28.0°C is fired at a speed of 210 m/s into a large block of ice at 0°C, in which it becomes embedded. What mass of ice melts (g)? Homework Equations I thought that the KE of the bullet would be transferred into heatThe Attempt at a Solution I used...

I recently talked to a friend of mine about microwaves. Specifically that (to my knowlege) the microwave radiation is primarily absorbed by a rotational degree of freedom of water molecules. Which got me thinking. 1.First of all what would happen if you put a extremely cold ice cube ( with no...

So basically, I was doing my AP Physics 1 homework and came across the spinning ice skater question yet again. The question states, "An ice skater is spinning about a vertical axis with arms fully extended. If the arms are pulled in closer to the body, in which of the following ways are the...

Homework Statement Two ice skaters crash into each other. Before they collide, one of them (50 kg) is skating in a straight line at 5 m/s, the other (40 kg) is skating at 4 m/s in a straight line at 90 degrees to the 50 kg skater’s direction. After the collision, the 50 kg skater is moving at 4...

Homework Statement An 8 cm3 ice cube (temperature = 0.00 °C) is dropped into a glass with 3 dL juice which results in the ice cube being melted. By doing this, the juice drops to a temperature of 3.00 °C. What was the temperature of the juice before the ice cube was added? (Treat juice as water...

http://www.wired.com/2013/10/mars-polar-ice-sample-return-1977-1978/ I found this old Wired article interesting. It makes me wonder, with all the cash that is thrown at Mars exploration these days, why an updated version of this has not been attempted? It would seem that analysis of a Martian...

Homework Statement An insulated beaker with neglible mass contains .3kg of water at a temp of 78.6 C. How many kg of ice at -19.6 C must be dropped into the water to make Tf= 22.7C? Specific heat for water= 4190 J/kgK specific heat for ice= 2100 J/kgK heat of fusion for water= 334kJ/kg...

I'm working on a new invention that requires a disposable instant ice pack using ammonium nitrate and water. I need the temperature of this new ice pack to get within the range of -15 deg F I have tried using larger quantities of ammonium nitrate but was only able to lower the temperature 6-8...

After passing the thermocline, in which water temperature decreases rapidly over short distances, temperature falls into a sort of constant-looking decline. However, looking at the graph, it looks almost asymptotic. I've not been able to find a chart measuring water depths below 10,000m, so I'm...

Homework Statement A boy is holding a box and moving at a constant velocity of 2m/s on ice. The masses of the boy and the box are 40kg and 2kg respectively.Then the boy drops the box. What is the momentum of the boy just after dropping the box? Assume that the friction between the boy and the...

Can someone explain how this happens?

hi, I apologize if this question is placed in the wrong area. I was not sure where it belonged. Can someone please help me with the following: Assuming the ice is very smooth, like that of your standard indoor hockey arena, how much much would an object have to weigh to remain stationary when...

Homework Statement The average kinetic energy of water at 0 °C is __________ the average kinetic energy of ice at 0 °C. Homework EquationsThe Attempt at a Solution I said that it is greater than because when ice melts, energy is added to break the potential energy (bonds). I also know that...

Suppose an ice cube is in a vessel and it is at a temperature slightly below 0 degrees Cesius. Suppose further that the inside of the vessel is a vacuum. If the temperature of the vessel is increased to slightly above zero Celsius and the vacuum is maintained would the state change in the ice...

Hi everyone I searched about the mass flow rates and temperatures of exhaust gases of light gasoline internal combustion engine at different condition but I don't fond anything yet . Anyone can guide me? .

I was reading that you can simply freeze water by using a vacuum. It boils then it freezes. I wonder how you could take the waters evaporation and have it filled back into the container once the vaccume is turned off. I feel this would work great to make lines under a car seat to add "cooled...

1 kg of ice at -20°C is mixed with 1kg steam at 200°C. Then find equilibrium temperature and mixture content. Please DON'T use Joules as unit while answering the question. Converting 1 kg steam at 200°C to 1 kg water at 0°C requires : (1* 0.5*100) + ( 1*540) + (1* 1 * 100 ) k cal heat = 690...

Homework Statement I'm given that for water near 0 degrees, dp/dT = ##-1.4\times 10^7PaK^-1##. And that water has a specific volume of ##1\times 10^{-3}m^3kg^{-1}##, while for ice the specific volume is ##1.09\times 10^{-3}m^3kg^{-1}##. Calculate the latent heat of fusion L for ice, and...

Hello, I was doing melting and solidification of ice kept inside a annular cylinder. The temperature of inside wall of cylinder is 80 degree. Now i want to analyse the total time consuming to melt the ice and plot temperature variation with time. Actually i did analysis but the result i found...

A metal block at 500 K is kept on a large ice slab at 273 K.The metal block completely sinks inside the ice slab. I was told that the water in contact with ice would not change its temperature while the block sinks down and hence the "only" heat transfer from the metal block to ice slab will...

I am trying to figure out how much ice i need to produce during daytime to cool a bedroom at nighttime. Currently a 9000 BTU Air conditioner with a separate indoor and outdoor unit is more than sufficient. The air conditioning is set to 24 degrees Celsius and the outdoor temperature goes from 32...

I'm sure this is a totally amateur question, but today I got one of those big ice cube trays for 2x2x2 inch cubes. I filled it up and put it in my freezer, and about 6 hours later checked on it but the water was not frozen at all. Not even a crust on top. I put my finger in one of the squares...

Homework Statement The Viking landers on Mars measured a seasonal change in surface pressure of 2.5 mb due to the variation in the seasonal extent of the ice caps. Ignoring any elevation variations on the surface of Mars, calculate the difference in the total mass of CO2 in both ice caps...

Homework Statement transfer 650 EJ (10^18 joules) into an ice cube of unknown size. the temperature of h20 increases from -10c to 20c. Given: 1) q=mc(t2-t1) 2) for phase change q=m(F) specific heat of ice (c)= 2.22x10^3 J.kg^-1.K-1 heat of fusion (f)= 3.33x10^5 J/kg specific heat of water (c)...

Homework Statement Find the triple integral for the volume between a hemisphere centred at ##z=1## and cone with angle ##\alpha##.The Attempt at a Solution What I tried to do first was to get the radius of the hemisphere in terms of the angle ##\alpha##. In this case the radius is ##\tan...

Homework Statement A person (with mass 60.0 kg) is located on a volume of ice, floating on the water. Calculate the smallest volume of the ice so that the person would remain above the water ( ice density = 917kg / m3)[/B]Homework Equations F= m xg Archimedes F = density x V xg [/B] The...

Hello everyone! I recently saw a problem about some ice in 2 containers. So: We have 2 vertical cylindrical containers, which have perfect insulating walls, one with surface of the base S and the other one 2S , filled with the same mass of ice. The question is if there is any diffrence between...

this ice formation occurred with temperature hovering near zero C. It looks like something that was made in a mould! I suspect that a combination of winds and pressures caused by growing ice crystals in the plastic bucket tilted some crystals which continued to grow. I

When an ice melts on water, which was initially floating on it, the water level must get increased. Why it remains unchanged??

Okay, so there is a large floating mass of ice in the sea. We know the time it takes to melt: it's 168 hours, or 604800 seconds. The temperature of the air is 25 degrees Celsius. The surface area of the ice is 2408 km^2. Temperature of the ice is -1 degrees Celsius. Thermal conductivity of...

Greg Bernhardt submitted a new PF Insights post All About Ice - Trivia Continue reading the Original PF Insights Post.

Homework Statement we have 42 grams of rum with a specific heat of 1.7 and 113 grams of coke with a specific heat of .85 and both liquids are room temperature (25 degrees Celsius). when you add 85 grams of ice (-10 degrees Celsius) into this mix, what will the final temperature be and how long...

Noting that ice expands by about 9%, why isn't it possible ot build a heat engine from this natural process?

Good afternoon. I am doing an study on ice X, a material with this structure http://postimg.org/image/nub4if9kb/ I want to know why in the centre of the brioullin zone the hidrogen atoms must remain at rest on an even mode. My reference book is Charles Kittle's, but there is no discussion about...

Homework Statement An ice cube melts in a 10oC glass of water (mass of water is 225g). If the ice is allowed to melt completely, what will the final temperature of the water be? (we're told that the mass of ice can be ignored) Ti = 10oC Latent heat of fusion = Lf = 334000 J/kg specific heat...

Hi! I hope I put this in the right place. I apologize if I didn't. We we're having a discussion here, as to why frost builds up in the freezer. The discussion has been something like this: Guy 1: The water in this room temperature bowl will weigh less and less over time. This is because...

Homework Statement What will happen when a large amount of water at 0 C is mixed with ice at - 20 C? Assume ideal conditions. Homework Equations N/A The Attempt at a Solution I think the ice will rise in temp (without melting) but no new ice will be formed. Is this right?

Hi there. What would happen if, while generating electricity with a fixed inlet power from the ICE, the alternator suddenly increase the out put demand by increasing the voltage? Does the engine would augment the torque while reducing RPMs? consider a self excited alternator, the voltage is...

G’day physics forum This is a purely hypothetical question and my knowledge of physics is rather limited so I’ve no idea if answering it is even possible however here goes: Imagine a 30cm long timber stick approximately 3mm in diameter that has been placed vertically in an inverted pyramid or...

I guess the question is also when. If you have some food or liquid to store. If you use a low quality cooler bag with 200mL to 300mL Ice pack at what point will a Vacuum seal with no Ice beat the cooler bag? I guess at the 10 hour mark or 24 hour mark or at some very long period of time.

For decades I've wonder. Is there an endothermic reaction between dry ice and acetone? With ice, salt forces a phase change lowering the temperature but that doesn't seem applicable here.

What will be the final temperature of 3.00 kg of crushed ice with temperature -3.0 C mixed with 4 liters of water with temperature 10.0 C? We can ignore all the energy exchange with the environment What I do know and I do: the weight of the ice = 3 kg Ice temprature = -3 C melting energy = 3...

At a temperature of 0 C the density of ice and liquid water is 0.9187 g/cm3 and 0.9998g/cm3 respectively. Consider a situation where the density of ice is increased to more than 8.83% at 0 C, what would be the consequences of this to the life forms? The life forms would vanish because of the...

Homework Statement The ice is placed in water, we know the surface area A, emissivity of both ice and water, Stefan-Boltzmann constant and the temperature of both ice and water. What is the equation for heat transfer rate between water and ice? Homework Equations Heat transfer rate by...

Hi I've read sufficient literature on Ice/Water expansion to understand that when water freezes into a lattice, the hydrogen bonds between molecules are longer than they are in liquid water, hence ice expands. However, everything I've read seems to skip over the reason why with statements like...