Ice Definition and 963 Threads

The John Hancock Center In Chicago Is The Tallest Building In The United States In Which There Are Residential Apartments. The Hancock Center Is 343m Tall. Suppose A Resident Accidentally Causes A Chunk Of Ice To Fall From The Roof. What Would Be The Velocity Of The Ice As It Hits The Ground...

ice displacing water question, --need help really bad Homework Statement A rectangular block of ice 6 m on each side and 1.1 m thick floats in seawater. The density of the seawater is 1025 kg/m3. The density of ice is 917 kg/m3. How high does the top of the ice block float above the water...

I realize that there has been a post recently concerning this sort of thing but i think it went a bit off topic for me to follow. :) The question is Consider a bowl containing 1 mol of ice at a temperature of -10C and atmospheric pressure. The sample is heated very slowly to 115C. Split the...

Would someone explain to me why back pressure is not needed on a 4-stroke engine and what exactly is exhaust back pressure? Thanks guys and gals.

I have the answer, it is because the refrigerator is not in freeizng mode when the cold ice cube tray is placed inside. When the warm tray of water is placed inside then the temperature lowers considerably and the thermostat switches the freezer into freezer mode. A common complication I...

Suppose you wanted to make an ice cream cone that would hold as much ice cream as possible (do not assume ice cream comes in spheres). Challenge I Cut a wedge from a circle and remove it. From the remaining piece of the circle into a cone. Find the angle of the wedge that produces the cone...

Homework Statement I'm trying to calculate the power required to melt a 57.65g mass of ice, using what my professor calls a "thermoelectric heater and cooler consisting of many thermocouples" (I think its really called a Thermopile, but I havn't heard him use the term.) I took...

Homework Statement A Carnot heat engine uses a hot reservoir consisting of a large amount of boiling water and a cold reservoir consisting of a large tub of ice and water. In 5 minutes of operation of the engine, the heat rejected by the engine melts a mass of ice equal to 3.50×10−2 kg ...

Melting Ice With Aluminum?? Homework Statement How many grams of aluminum at 90 degrees C would have to be dropped into a hole in a block of ice at 0.0 degrees C to melt 10 g of ice? Homework Equations Q = (m)(c)(deltaT) c of aluminum = 0.9 c of ice = 2.1 c of water = 4.186 333.7...

[SOLVED] Universal Gravitation Ice Rink Problem! :) never mind

Homework Statement Find the volume of an ice cream cone bounded by the sphere x^2+y^2+z^2=1 and the cone z=sqrt(x^2+y^2-1) Homework Equations The two simultaneous equations yield x^2+y^2=1 The Attempt at a Solution Attached

Disney's movie "Ice Princess" mistake? so I watched the movie over the summer... here's word for word out of the script "Now, l'm going to increase the centripetal force by tucking in my arms. This will increase my moment of inertia, so l will spin...faster." so it's been bugging...

1. My professor gave us an extra credit problem in which we have to prove that water level does not change when ice melts. [b]2. (v)ice=(v)displaced water [b]3. any ideas?

Homework Statement (a) What is the buoyant force on 0.70 kg of ice floating freely in liquid water? _____ N upward (b) What is the buoyant force on 0.70 kg of ice that is held completely submerged under water? ______N upward Homework Equations ? The Attempt at a Solution...

Homework Statement A person of mass M is standing at one end of a board of mass m and length l. The board rests upon frictionless ice surface, and its mass is uniformly distributed along its length. The person now walks to the center of the board and stops. In terms of the given quantities...

Board on Ice 1. A person of mass M is standing at one end of a board of mass m and length l. The board rests upon a frictionless ice surface and it's mass is uniformly distributed along its length. Calculate how far from the person, d, the centre of mass is of the system. The person then walks...

I decided to speed things up by scrapping off the ice and I punctured the side of the ice box. I used some silicone filler to seal it. Will it work?

Another URGENT HELP problem: Steam to Ice Homework Statement How many J of energy must be removed when 127.0 g of steam, at a temperature of 153.0°C, is cooled and frozen into 127.0 g of ice at 0°C? Take the specific heat of steam to be 2.1 kJ/(kg·K). Homework Equations Q1 = mc(delta...

Homework Statement How many J of energy must be removed when 145.0 g of steam, at a temperature of 188.0°C, is cooled and frozen into 145.0 g of ice at 0°C? Take the specific heat of steam to be 2.1 kJ/(kg·K). Homework Equations Q=m*L The Attempt at a Solution Energy =...

Homework Statement A block of ice at 0°C whose mass initially is m = 50.0 kg slides along a horizontal surface, starting at a speed vo = 5.72 m/s and finally coming to rest after traveling a distance d = 21.37 m. Compute the mass of ice melted as a result of the friction between the block...

200g of steel was placed on a big block of ice. The ice was 0 degrees C. The metal was 150 degrees C. How much ice gets melted? My attempt: Q=mc(changeinT) Q=.2(460)150 Q=13800 Q=ML 13800=M(3.34x10^5) M=.041317 kg is melted Is this correct?

Homework Statement 5L of liquid nitrogen @ -205 degree celsius and 1L of liquid ice cream @ 15 degree celsius - they are both mixed. upon mixture nitrogen evaporates and ice cream hardens or freezes. Assuming only 14% of the energy gained by the nitrogen in the process of warming to room...

Please help...How much ice melts? Homework Statement A 70 gram bullet traveling at 250 m/s penetrates a block of ice at 0 degrees Celsius and comes to rest within the ice. Assuming that the temperature of the bullet doesn't change appreciably, how much ice is melted as a result of the...

any one know the formula for an ice skater in an increasing spin

hi everyone this is a related rates question no one in the class could solve it. I could not find how to find the equation that relate all the things in the question.the question is: A spherical iron ball 8 in. in diameter is coated with a layer of ice of uniform thickness. If the ice melts...

Hi, This is not directly related to any assignment but I have a question. Is it better (meaning the drinks in the cooler will stay cold longer) to leave the cold water in a cooler or to drain the cold water out of the cooler. Personally, I am inclined to think that you maintain a higher...

A cubical block of ice is melting in such a way that each edge decreses steadily by 8.8 cm every hour. At what rate is its volume decreasing when each edge is 5 meters long? this is my work Let l=l(t) be the length of each edge at time t then volume = l^3 dl/dt = 8.8cm/h = .088m/h...

Can someone help me understand this: By salting the crushed ice, the beer got cold faster. Why?! I have recently studied some Enthalpy, so if anyone could give me an explanation to this using anything related to Enthalpy I'd be very grateful!

Homework Statement You are planning a stunt to be used in an ice skating show. For this stunt a skater will skate down a frictionless ice ramp that is inclined at an angle of 15° above the horizontal. At the bottom of the ramp, there is a short horizontal section that ends in an abrupt drop...

The question is: Two horizontal forces F1 and F2 act on a 1.8 kg disk that slides over frictionless ice, on which an xy coordinate system is laid out. Force F1 is in the negative direction of the x-axis and has a magnitude of 3.0 N. Force F2 has a magnitude of 9.0 N. The figure below gives...

I'm looking for a one single solid textbook about Ice Ages. People are mentioning Imbrie's "Ice Ages" but it looks just a little old. I'll borrow it soon. Thanks for your interest.

The Question: (1) You are standing on a sheet of ice that covers a parking lot; there is negligible friction between your feet and the ice. A friend throws you a 0.400 kg ball that is traveling horizontally at 10.2 m/s. Your mass is 73.4 kg. (a) If you catch the ball, with what speed do...

You are driving a 2580.0 kg car at a constant speed of 14.0 m/s along an icy, but straight, level road. As you approach an intersection, the traffic light turns red. You slam on the brakes. Your wheels lock, the tires begin skidding, and the car slides to a halt in a distance of 26.4 m. What is...

Homework Statement i think i might have it right but i want a 2nd opinion (mainly part c) 31 flavors of icecream. we are picking 12 cones(1 scoop). a) cannot have same flavor twice b) can have any flavor up to 12 times c) can have any flavor up to 11 times but not 12 The Attempt...

I have this problem, but I could not understand. pls help Steam at 100 degree celsius is added to ice at 0 degree celsius. The mass of the steam is 10 g and the mass of the ice is 50.0 g. What is the final temperature of the mixture? thanks a lot.

I need to estimate the amount of time that an ice pick can be balanced at it's tip and the only limitation is set by the Heisenberg uncertainty principle. I assume the tip is sharp and the surface that the tip rests on is hard. I can also assume values of dimensions and weight as long as the...

i have this going in the introductory physics forum, and was just looking for a different perspective/insights into how to do this problem if any of u couldlook at that would be great, thanks.

Homework Statement A 49 kg woman is ice-skating toward the east on a frictionless frozen lake when she collides with a 97 kg man who is ice-skating toward the west. The maximum force exerted on the woman by the man during the collision is 160 N, west. Take east to be the positive direction of...

Homework Statement An insulated beaker with negligible mass contains liquid water with a mass of 0.350 kg and a temperature of 69.7degrees C. How much ice at a temperature of -17.5degrees C must be dropped into the water so that the final temperature of the system will be 33.0 degrees...

I see that the current explanation for a comets tail is that as a comet approaches the sun, it starts to heat up. The ice transforms directly from a solid to a vapour, releasing the dust particles embedded inside. Sunlight and the stream of charged particles flowing from the sun – the solar wind...

Homework Statement While walking on ice,one should take small steps to avoid slipping.Because the smaller step ensures (i)larger friction (ii)smaller friction (iii)larger normal force (iv)smaller normal force Homework Equations The Attempt at a Solution I have the following...

Hi. Could someone please help me with the following M1 vector question? I would really appreciate it as I am really stuck. At time t = 0, two ice skaters John (J) and Norma (N) have position vectors 40j metres and 20i metres relative to an origin O at the centre of an ice rink, where i and...

So, I've noticed that when I freeze ice cubes these strange icicles appear on the top of the ice. I took a picture, included as an attachment. Not really sure how something like this forms. Please no speculation.

Homework Statement A block of ice with mass 2.00kg slides 0.750m down an inclined plane that slopes downward at an angle of 36.9degrees below the horizontal. f the block of ice starts from rest, what is its final speed? You can ignore friction. Homework Equations F=ma, trig...

Homework Statement A block of ice with mass 2.00kg slides 0.70m down an inclined plane that slopes downward at an angle of 30degrees below the horizontal. If the block of ice starts from rest, what is its final speed? Homework Equations W = 1/2(m)(v2)^2 - 1/2(m)(v1)^2 The Attempt at a...

in linear momentum, considering the collision of 2 particles to deudce that the momentum in a closed system is concerved (W_1 + F_12)t = m.v_f1 - m.v_01 ...(i) where W_1=external force during impact F_12=force acting on body 1 by body 2 in collision t=impacting time m.v_f1= momentum of...

Homework Statement The equilibrium constant for the esterification of benzoic acid with methanol is 3. Calculate the theoretical yield of benzoate expected using 0.082 mol of PhCO2H and 0.62 mol of CH3OH. I just need my work checked. Homework Equations See below. The Attempt at a...

Question A 54.0kg ice skater spins about a vertical axis through her body with her arms horizontally outstretched, making 2.50 turns each second. The distance from one hand to the other is 1.5m. Biometric measurements indicate that each hand typically makes up about 1.25% of body weight...

Homework Statement How long does it take the Sun to melt a block of ice at 0°C with an area of 1.10 m2 and thickness 1.07 cm? Assume that the Sun's rays make an angle of 31.1° with the normal to the area, and that the emissivity of ice is 0.0400. Homework Equations Q/t = IeAcos(theta)...

So everyone knows about this method of making ice cream, cooling drinks, w/e. You add salt to ice and it lowers the freezing/melting point and this cools things below 0C. I understand why the freezing point is lowered and all that but I don't understand why this cools things down faster. So...