Ice Definition and 980 Threads

Hi, I encountered this problem while I was studying for a Physics test, and this is how far I got, hopefully someone can point me in the RIIGHT direction. The proof goes like this, a guy is sitting on the top of an ice hemisphere, and someone pushes him off, and so he slides down the...

http://www.abc.net.au/science/news/stories/s1485573.htm

When researching the climate during the ice ages (Pleistocene) large isotope jumps were discovered in the ice cores , and obviously they were tied to the supposed large temperature changes. This was quite logical since those spikes seem to be co-dated with ice age transitions to moderate...

During one hot summer, a physics grad student went to the local toy store and purchased a plastic child's swimming pool. Upon returning home, he filled it with 200 liters of water at 25 C. Realizing that the water would probably not be cool enough, he threw ice cubes from his refrigerator, each...

If we could determine how much ice is melting in the polar caps we could find out how many powerstations it would take to refreeze the ice.

http://www.lsbu.ac.uk/water/amorph.html puts the densities of various forms of amorphous ice at densities that are very low. g/cm-3 in fact. Is this a typographical error? If not why is it so dense? Crystalline ice's densities are attributed to all the empty space in-between crystals, amorphous...

A 36 kg block of ice slides down a frictionless incline 1.2 m long and 0.48 m high. A worker pushes up against the ice, parallel to the incline, so that the block slides down at constant speed. (a) Find the magnitude of the force exerted by the worker. (b) Find the work done on the block by...

Let supply and demand functions for butter pecan ice cream given by p=S(q)= 2/5q and p=D(q)=100 - 2/5q where p is the price in dollars and q is the number of 10-gallon tubs. Find the equilibrium quantity and the equilibrium price. do i just set them equal to each other?? 2/5q=100-2/5q...

Oh hello This's just strange. We did a small project "Making ice-cream" You know, put milk and sugar and vanilla into a zimploc, place the pack into a bigger one stuffed with ice and salt. We've luckily gone through the questions he asked. But the last question just doesn't make sense to me...

A 58.0 kg ice-skater moving at 6.25 m/s glides to a stop. Assuming the ice is at 0°C and that 53.5 percent of the heat generated by friction is absorbed by the ice, how much ice melts? Should I first calculate the work? I know I need to use Delta U= Q-W...but what is Delta U in this case?

Not long ago I read an article here in PF about explosion of dry ice in a bottle and I just accidentally found one of the video... If you are interested, u might want to check it out: http://www.spikedhumor.com/Article.aspx?id=360 Another physics experiment performed on water balloon...

I havn't seen this posted here, but its a nice picture of ice on mars. http://www.esa.int/SPECIALS/Mars_Express/SEMGKA808BE_0.html Is this the result of a comet hitting Mars and depositing the ice?

when you walk the reaction of your thrust is the Earth going very slightly in the other sense but how can an ice skater that having the skates perfectly parallel while thrusting pushes sidewards and advances forward besides taking into account that being the skates parallel the longitudinal...

Some help with this question please? a) An ice cube floats in a glass of water. When the ice melts, will the water level in the glass rise, fall, or remain unchanged? Justify your answer. b) If the ice had been made from pure water, and the water in the glass was salt water (denser than...

I just found this on the web and thought i`d share... As we all know, it takes 1 calorie to heat 1 gram of water 1 degree centigrade. Translated into meaningful terms, this means that if you eat a very cold dessert (generally consisting of water in large part), the natural processes which...

If Ice Age suddenly come back, What will people do?

Okay, this is something that's been bugging me for a long time, and I should have asked my physics teacher this past year way back when we were discussing mechanics, but I never could remember to do it. Let's say I have an identical twin, and we're both on a big frozen pond, standing still...

Please help. What would the final temperature have been if 156g of aluminium metal at 50c had been added to iced water containing 10g or ice and 90g of water at 0c? delta H for the freezing of water is -6.02kJ/mol. I don't see how delta H becomes incorporated. Do I have to take into...

Our air conditioner has broken so i was bored and started thinken about something. I calculated that a 10 pound bag of ice will cool my room (which i figured is about 4500 ft^3... yah... i love my room lol) from about 86 freaken degrees! to about 72 degrees fahrenheit. In my calculations i...

Two ice skaters, Daniel (mass 65.0 kg) and Rebecca (mass 45.0 kg), are practicing. Daniel stops to tie his shoelace and, while at rest, is struck by Rebecca, who is moving at 13.0 m/s before she collides with him. After the collision, Rebecca has a velocity of magnitude 8.00 m/s at an angle of...

I want to know why we can easily slide on ice when we wear skating shoes. Originally, I guess it is due to the friction between the metal and the ice. But I think it is not the correct answer. Could anyone help me with this problem. Thanks a lot, Sarah :smile:

Ok I've always had this weird feeling/fear that if i use like, the chopped off parts of ice cubes (the small parts you get when you 'crack open' a tray of ice cubes) in my cup for sodas... that the ice will melt quicker and dilute my soda quicker then if i used the big nice ice cubes that come...

Can anyone help me? possibly conservation of momentum, etc

What law or physics principle is that? Thanks for the help.

Please help. In a well-insulated calorimeter, 1.0 kg of water at 20C is mixed with 1.0g of ice at 0C. What is the net change in entropy of the system by the moment the ice completely melts? The heat of fusion of ice is 3.34*10^5 J/kg. I'm not sure how to do this problem. I thought that...

I need need. I did the experiment, but I cannot answer the questions. Can anyone help? How does the sugar affect the ice cream mixture? How does the salt affect the ice bath? I believe it lowers the temperature. Compare the affects of the salt and the sugar on their respective...

Where does the Kinetic energy of the expansion of freezing ice come from? For example, say you had a gram of water inside a piston. The water freezes and the expansion of ice pushes the piston up. Since the heat of fusion of water is 80 calories per gram, let's say to initally melt that ice to...

A person makes a quantity of iced tea by mixing 559 g of hot tea (essentially water) with an equal mass of ice at its melting point. If the initial hot tea is at a temperature of 94 C, what are the (a) final temperature of the ice tea (in oC) and (b) mass of the remaining ice? what are the (c)...

Do i need to work on ice when i do Hot start PCR? Hope for inputs. Thanks.

Trying to beat the heat of summer, a physics grad student went to the local toy store and purchased a child's plastic swimming pool. Upon returning home, he filled it with 200 liters of water at 25 C. Realizing that the water would probably not be cool enough, he threw ice cubes from his...

Working out: Q_b = m_beaker * c_water * change in temp. of beaker Q_b = (0.205)(4190)(26.7-79.9) = -45696.14J Q_1 = m_ice * c_ice * change in temp. of ice Q_1 = m_ice(2100)(26.7- -10) = m_ice(77070) Q_2 = m_ice * L_f Q_2 = m_ice(334000) Q_b + Q1 + Q2 = -45696.14 + m_ice(77070) +...

A person is making homemade ice cream. She exerts a force of magnitude 22 N on the free end of the crank handle, and this end moves in a circular path of radius 0.25 m. The force is always applied parallel to the motion of the handle. If the handle is turned once every 2.0 s, what is the...

Question #1: If all of Earth's polar ice were suddenly to melt into the oceans, in the short term the length of the day would a) increase b) remain the same c) decrease d)first decrease, then increase The answer is a) , but why? Question #2: An ice cube of pure fresh water...

Why and how does ice sublimate in the freezer?

We've all had this problem... had soda sitting around... drinking it slowely... and all the ice melts and now it tastes crappy because of the water. Is there anyway to extract the water from it without ruining the soda lol.

suppose that 3.1 kg of shaved ice is needed to keep medication cold in a room without a refrigerator. What amount o heat must be removed from the 3.1 kg of water to make ice once it has reached 0 deg C

take an ice cube at 0 degrees C and place it in 500 grams of water at 60 degrees C . The final temperature is 18 degrees C . What is the mass of the ice cube? heat of fusion for water is 80 cal per g. Anyone?

I have trouble figuring out the following question. Please help. ------------------------------------------------------------------------ Suppose you want to melt a piece of ice and boil the resulting water by using a microwave oven. The radiation is incident upon one side of the ice which...

A perfect hemisphere of frictionless ice has radius R = 8 meters. Sitting on the top of the ice, motionless, is a box of mass m = 10 kg. The box starts to slide to the right, down the sloping surface of the ice. After it has moved by an angle 14 degrees from the top, how much work has...

In a well-insulated calorimeter, 1.0 kg of water at 20 C is mixed with 1.0 g (.001 kg) of ice at 0 C. What is the net change in entropy of the system by the moment the ice completely melts? The heat of fusion of ice is 3.34 x 10^5 J/kg. I must find the changes in entropy for the water and...

Of course I mean my table salt, specificly, but how does salt melt ice?

Our current interglacial period has lasted about 11,500 years, now the common figure is that interglacial figures usually last around 11,000 years. Has anyone heard any convincing evidence that the next ice age is indeed going to be upon us soon?

Hi, I need some help with my thermal physics. I posted these questions on the high school forum (I'm just a junior in high school), but my physics teacher takes questions out of college-level books, so I thought it would be more appropriate if I posted here. The two questions are: 1. An...

The global warming bane for flooded civilization, geology and ecosystems at low altitudes can be a bonus for glaciologists "while they last" in higher latitudes. Would you like to predict what treasures the thawing climate will reveal in the world's remaining glaciers?

Really needed info. Saprkling Ice?? I have a question for you. Well can somebody tell me why when you crack de icebox in COMPLETE darkness so you can take de icecubes out of it, the ice cubes sparks?? the cubes when broken emit a light green sparkle, like a flash. Which is the name of that...

Is it possible to make very clear ice in a home freezer? Tap water ice is often cloudy white, which I think comes from minerals in tap water. Making ice with distilled water is a pretty conclusive experiment, I think. However, the ice cubes I make with distilled water still have many small...

... asked what to study if he wanted to investigate creationism versus evolution. I advised continuing physics and chemistry and avoid having to learn flawed theories as paradigms. So, predictably, I was challenged to expose some of them. I choose for the problems in the 100,000 "ice age" cycle...

From looking at the ice phase diagram (btw, does anybody have a high quality version of this? the one I looked at isn't that great), it appears that ice will remain in its first phase at pressures ranging from 0-14k psi. So if there is water in a container that is capable of resisting 15k psi...

when talking about conservation of angular momentum of a spinning ice skater, the contact surfaces are assumed to be frictionless. why?

Here's my problem: For each kW of power input to an icemaker at steady state, determine the maximum rate that ice can be produced in kg/h, from liquid water at 0 C. Assume that 333 kJ/kg of energy must be removed by heat transfer to freeze water at 0 C, and that the surroundings are at 20 C...