Ice Definition and 980 Threads

Homework Statement A girl, with the mass m, slides down an icy slope at the time t1=τ. The slope is inclined at 30° below horizontal. The coefficient of kinetic friction between the girl and icy slope is μk. The girl notices that she can slide down the slope significantly faster if she sits on...

Homework Statement A person (mass 57.8 kg) tries to penetrate a garden fork (mass 1 kg) into a melting block of ice by standing on it with all his/her weight. Assume that no heat flows from the fork to the ice. The fork has four prongs, and each prong has a square cross section of area 1 mm2 ...

Homework Statement The sphere of lead with mass 2kg and velocity 20m/S hits a block of ice and is stuck in it. Find the mass of ice that melts during the hit. The initial temperature of the sphere is 293 K and c=128J/kg*grade. Homework Equations m1v1=m2v2 The Attempt at a Solution I thought...

Homework Statement how many photons (lambda=620*10^-9) must be absorbed to melt 2kg block of ice at 0deg into water at 0deg? and on average, how many H2O molecules does one photon convert from the ice phase to water phase? Homework Equations E=hc/lambda The Attempt at a Solution I have no idea...

Hi I have a project to were I would like to melt ice from several feet away. Is there an electromagnetic transducer that I can operate to melt ice? What resonate frequency would I need to use? Any ideas? Thanks

Homework Statement In our science class, we had to draw a free body diagram of an ice skater. The ice skater pushes against a force plate and that results in her skating in the other direction. (Newton's third law of motion). We have to use Newton's three law of motions to explain this...

Hi! I'm new here and I can't find anything helpful through google so I thought I'd give PF a try. Sorry for not using the template fully but I have no ideas on how to solve this problem. 1. 0.1kg ice at 263K is added to 1kg water at 273K. Calculate new mass of the ice. 2. I know how to do this...

Homework Statement "If a cup of tea (175.0 mL, 90.0°C) is cooled by adding an ice cube (25.0 g, -15.0°C), what is the final temperature of the tea? The heat required to melt ice (heat of fusion) is 80.0 cal/g." Homework Equations S.H. of water (solid) = 0.5 cal/g°C The Attempt at a Solution 1...

Homework Statement Two students sit on opposite ends of a sled 6 m long initially at rest on frictionless ice. Each student has a mass of 50 kg; the sled’s mass is 40 kg. The student at one end slides a 2-kg object on the sled across to the other at a uniform speed of 5 m/s relative to the sled...

Homework Statement 5.0 kg of ice at 0◦ is put into 3.0 kg of water at 20◦C. Assuming that they are isolated, that cH2O = 4186 J /kg K , and that L = 3.3 × 105 J/ kg how much ice is left when the system comes to equilibrium? Homework Equations Q= +/- mL Q=mcΔT The Attempt at a Solution...

Homework Statement The problem is this: what is the optimum amount of dry ice inside the Styrofoam pack, if we want to received a frozen dough (temp.-18) after 3 days of transportation in temperature 20 C ? My calculations and data placed in the attached excel file, but I'm not sure if they...

http://www.planetary.org/blogs/emily-lakdawalla/2015/03121716-ganymede-ocean.html It's interesting how they infer ice layer from rotation rate and outer shape and density. And then solve some equations to see if (within the ice layer) there could be a liquid ocean of a certain depth below...

Homework Statement Homework EquationsThe Attempt at a Solution I know that the solution involves setting the normal force to zero and equating the radial component of gravity to centripetal force. But why is it not possible for the normal force to decrease at a sufficiently low rate such...

Homework Statement A 5.1 kg penguin runs onto a huge sheet of frictionless Antarctic ice. At t=0 it is at x=0 and y=0 with an initial velocity of 0.39 m/s along the positive x-axis. It slides while being pushed by the wind with a force of 0.53 N directed along the positive y-axis. Calculate the...

Homework Statement **This thread could also belong to the chemistry forum** *This isn't an actual homework problem, but it is a simple question, so I put it here in the homework forum. I am under the impression that the physics forum is for more advanced questions* How deep would an ocean on...

Homework Statement a puck on the ice travels 20.0 m [5.0 degrees E of N], gets deflected, and travels 30.0 m [35.0° N of W]. Determine where the puck will end up with respect to its starting point, e.g., the puck's total displacement Homework Equations c^2=a^2+b^2-2abcosC The Attempt at a...

How much temperature is needed to melt ice -30C that covers an area of 34 million km2 and has the height of 11.4 km in 400 years? For example, X number of celsius degrees are applied non-stop for 400 years in order to melt this ice entirely from the surface (turn to water)

Homework Statement Iron ball Mass = 0.8 kg, Cp=484, Ti=80 Celsius edit : Cp = 448 Aluminum Bucket = 0.5 kg, Cp=900, Ti=20 Celsius Water = 0.6 kg, Cp=4186, Ti=20 Celsius Ice cube=0.5 Kg, Cp=2090, Lf=3.33e5, Ti=-5 Celsius Find the final temperature of the bucket. Homework Equations Delta Q = 0...

Question statement A 55g ice cube can slide without friction up and down a 25∘slope. The ice cube is pressed against a spring at the bottom of the slope, compressing the spring 10cm . The spring constant is 25N/m. When the ice cube is released, what distance will it travel up the slope before...

I know the specific volume for Ice is higher than water so increases in pressure make it more favorable for the ice to go to water (hence a negative slope on a phase diagram rather than positive) Is there a point at which if the pressure was so high that it would be have to be liquid no matter...

Im new to this forum and I am seeking some help. I have recently doing a project for ice cream. In order to choose a suitable filler for filling process, i need to calculate the power requirement and capacity for the pump filler. I m really hope that you can show me the step for this calculation...

Homework Statement A 6.00-kg piece of solid copper metal at an initial temperature T is placed with 2.00 kg of ice that is initially at -20.0C. The ice is in an insulated container of negligible mass and no heat is exchanged with the surroundings. After thermal equilibrium is reached, there is...

Homework Statement A 100 kg man sitting on a frozen lake throws a 1.5 kg boot horizontally with a speed of 20 m/s. He is 5m from the shore and the coefficient of kinetic friction is 0.0009. How long does it take for him to reach the shore?Homework Equations ∑ F = m*a v2 = v02 + 2a(x − x0) v =...

Homework Statement Question: What minimum volume must a slab of ice in a freshwater lake have for a 50.0kg woman to be able to stand on it without getting her feet wet? Homework Equations Archimedes principle...

what is Deposition, also known as desublimation, point of CO2 is it room temperature? i don't think so then how can we obtain this at room temperature as in this video and what pressure is required to solidify co2,is it 1 atm ?i don't think so then how we obtain this in a room as in above...

Here's the problem. How much heat is required to raise the temperature of $50.0$g of H$_2$O ice at $0.00^{\circ}$C to $30.0^{\circ}$C? Assume an average $1.00 \text{ cal/g}^{\circ}$C specific heat for water in this temperature range. Since he said ice I assumed all $50.0$g is ice and therefore...

Hi everyone, I have just brewed some tea for myself and my brother,and I am confused with the timing of the addition of ice cubes. I had prepared 2 cups,label them A and B. At the beginning,A was empty and B was filled with 2 ice cubes. Soon the water boils,I pour a roughly equal amount of tea...

Homework Statement A 0.315-m-thick sheet of ice covers a lake. The air temperature at the ice surface is -17.8 °C. In 3.80 minutes, the ice thickens by a small amount. Assume that no heat flows from the ground below into the water and that the added ice is very thin compared to 0.315 m...

Disclaimer: all of the following is mostly theoretical* So on Europa the pressure on the surface of the ice crust is 0.1 microPa * Gravity on the surface is 1.314 m/s^2 * The ice crust is estimated to be ~10-30 km thick * Beneath the crust is about 100 km of liquid water * According to my...

Homework Statement Velma and Mort have identical 10-minute melting ice-cream cones. How fast must Velma move in order for her 10-minute cone to last 3 times longer than Mort’s, as measured by Mort?Homework EquationsThe Attempt at a Solution [/B] We have not gotten too in depth into...

Homework Statement A 50 gr piece of ice at temp' -100C is thrown in water which is at 00C. How much water will freeze around it. no heat is lost or gained from outside. Homework Equations Specific heat of ice: 0.55 Melting heat: 79.7[cal/gr/C0] The Attempt at a Solution The ice comes from...

Homework Statement Why is it that the horse closest to the axis of rotation on a merry go round spins slower than the horse on the outer edges of the merry go round? I saw this video on youtube and got confused at the first merry go round example: According to conservation of mass, isn't v...

Homework Statement If you have data such as time of rotation when arms are extended and the lengths of their folded and extended arms measured from the centre of the skater. I know I1ω1=I2ω2 and can work out ω from the radius and time of rotation. Where can I go from here to estimate the mass...

Homework Statement A child is pulling a 10kg sled along a horizontal plane of ice with a force of 50N directed 60 degrees north of east. Find the force of friction between the ice and the sled, given that the sled is moving at a constant velocity. Homework Equations Fnet = ma Fnet = Fx - Fk...

Can someone please explain why the melting point of ice decreases with increase in pressure? I understand that generally speaking for a solid, greater the pressure applied, greater energy needed to break the bonds to change state and hence greater the temperature (melting point). What is the...

Problem: Consider an ice skater spinning in a circle. We will approximate the body as a cylinder with a radius of 0.25 m. The total mass of the skater is 50kg. When the skater has her arms extended we will approximate her body as a cylinder with two rods attached. Each arm is 0.75 m long and has...

During the history of Earth, there have been several ice ages. What caused the climate to cool so much to create these ice ages?

Hi everyone! for a marketing campaign we want to shatter ice or glass using sound - like when in films someone screams and all glass windows break..Is this feasible and how would you go by doing it? Any help would be much appreciated! Thanks :)

Homework Statement Calculate the entropy change of an ice cube of mass 10g, at an initial temperature of -5°C, when it completely melts. cice = 2.1 kJkg-1K-1 Lice-water = 3.34x105 Jkg-1 Homework Equations dQ = mcdT dS = \frac{dQ}{T} ΔS = \frac{Q}{T} Q = mL The Attempt at a...

Homework Statement Ice at 0°C is added to a 1 kg of lemonade cooling it from 20°C to 0°C. How much ice melts? (The heat capacity of lemonade equals that of water.)Homework Equations Q = mcΔTThe Attempt at a Solution Found the heat in of the lemonade to the ice... = 83.38 kJ and don't know...

This has been bugging me... We all know the classic problem about how the consuming ice water burns calories, although if you drink 8 glasses a day it is only 70 calories... I wonder about taking that to the extreme but it is hard to burn much more than that as one can only drink so much water...

Hello everyone! my question is why the ice of Antarctica and arctic, it is made of sweet/fresh water,even though it is water of the sea that froze as far as i know. at least in antarctica there is land underneath so just maybe it is accumulation of rain and snow and hail though it does sound...

Hi guys, New to the forum wanted a little help in designing an insulated ice mold. Basically the objective is to force the water in the mold to freeze axially or in one direction in order to make clear ice. Ideally, the time taken for the ice cube to freeze from the top surface exposed to the...

Hello. My name is Brian McKinley. I beginning work on a hard(ish) science fiction comic titled Verdant Spiral. I thought this would be a good place to get feedback to make sure my ideas are plausible. All feedback is welcomed, and thank you all in advance. The first story takes place on an...

Homework Statement You are required to calculate the efficiency of an ice-making machine that takes in water at a temperature of 16°C and produces ice cubes at a temperature of -6°C. Water is taken in at the rate of 1kg every 5 minutes and the input power to the machine is 300W. The Specific...

Homework Statement We insert into a copper container (weighing 1.5 Kg) 3 Kg of water vapour at 100 ºC. Inside the container there are 10 Kg of ice at -10ºC. Find the ΔT when the system reaches the equilibrium. Known data: the specific heats of water, copper and ice and the latent heat of...

Homework Statement 0.02 kg of ice and 0.10 kg of water at 0 degrees Celsius are in a container. steam at 100 degrees Celsius is passed in until all the ice is just melted. How much water is now in the container? Specific latent heat of steam = 2.3 * 10^6 J/kg Specific latent heat of ice = 3.4...

OK, I'll dive in and start a climate change thread. I'm fascinated by the Nature paper by Abe-Ouchi, et.al., which I already uploaded in post #21 of this thread. If you look at Figure 1, the model does an outstanding job of modeling the last several ice ages. I have been somewhat skeptical of...

Yes, curious about that. (No, I'm NOT asking about some short term disturbances when glaciers were melting, but whether with lower temperature and part of continental shelf above water caused the currents to change their direction)

Homework Statement "A boy is initially seated on the top of a hemispherical ice mound of radius R = 13.8 m. He begins to slide down the ice, with a negligible initial speed. Approximate the ice as being frictionless. At what height does the boy lose contact with the ice?" 2. The attempt at...