Specific Definition and 1000 Threads

Homework Statement Find the equation of the form y = Cekt if it passes through (0, 4) and (5, 1/2) Homework Equations y = mx+b? The Attempt at a Solution When I see "find the equation", my instant reaction is to find the derivative of y = Cekt. Once I have the derivative (or the...

I'm trying to figure out how to build a breadboard instrument using either push buttons or logic switches as they keys that will play each note. The issue that i am having is that I don't think finding all of the perfect resistor and capacitor combinations for each note is a good idea. So, i...

Homework Statement (a) Steam coming from a geyser at 100°C expands as it rises into the air. Since this expansion is rapid over the first small time interval we can assume that this occurs with no heat loss to the surrounding air in the region of the vent. What happens to the temperature...

Hello I do not remember the layout for posting and it is not posted because I'm on my mobile phone but I need help finding volume of hot water given the volume and temp of cold water and the temp of hot water. I need help finding specific heat given mass and temp and I...

If specific orbital energy for an elliptical orbit is -\frac{\mu}{2a} , shouldn't that mean that the further from the Earth an orbit is the lower its specific orbital energy? The Wikipedia page on specific orbital energy (admittedly not the best source) indicates the opposite, and if it were...

Hi, I am trying to shade two portions of the polygon defined by the dotted line in this code. The Mesh and MeshFunction cmds seem to allot global shading only. What is the best tool to shade, say half of the aforementioned polygon? Function[{LtMarg, BotMarg, RtMarg, HVal, DVal, rVal}...

Homework Statement Must the specific volume of a substance change when it undergoes a change in pressure? Is this true for all substances? The Attempt at a Solution obviously this is true in most cases but my question is: are incompressible liquids an exception? When a liquid is attempted to...

Homework Statement Calculate the energy need to change 9 g of ice at -20 degrees Celsius to steam at 110 degrees Celsius. (C for ice=2.06 J/g, C for water=4.18 J/g, C for steam=2.02 J/g, Hf of ice=334 J/g, Hv of water=2260 J/g) Homework Equations Q=hv / Q=mHf / Q=mc(delta)t The...

Homework Statement I need to solve the following ODE using the laplace domain: y' + 4y + 20(integral from 0->t)y(t)dt = 34e^-t on the interval 0<t<4 (y(0) = 0) Homework Equations I can solve the ODE fine, no problems. But I'm a little confused on how to evaluate it strictly on...

IS it possible? say if the specific heat is 800 and the composition is made up of 2 materials one which has specific heat of 850 and the other of 750

Homework Statement i just don't really get the one step subgroup test, which is very important, and something i should understand. can someone walk me through in general how to use the test? maybe give me a simple example? thanks. Homework Equations The Attempt at a Solution

Hi everyone, I'm not a computer scientist by any stretch, so I really apologise if this is a stupid question. This is my situation: I'm trying to help out one of my colleagues who has written a highly numerically intensive program which consumes RAM. He now has a large number of...

Homework Statement I heated 50mL of water in a Dewar and measured the temp. change with time. however, this only gives me the heat capacity of the system. I again measured but with 100mL of water, in an attempt to correct for the unknown heat capacity of everything but the water. However...

Homework Statement In order to find the specific heat capacity of an unknown material, a 50g piece is heated to 80 degrees Celsius and fully immersed in a well insulatyed calorimeter filled with 100g of water at 10 degrees Celsius raising the temperature of the water by 5 degrees, the heat...

Homework Statement A .4lb piece of Hg at 210 F is placed in .3lb of water that has a temperature of 70.0f. The water is in .1lb brass calorimeter. What is the final temperature of the mixture? Homework Equations Q=MC(deltaT) The Attempt at a Solution The part that I'm...

Q. Thermal energy is supplied to a melting solid at a constant rate of 2000 W. Calculate the mass of the solid changed to liquid in 2.0 minutes. Assume that the specific latent heat of fusion of the solid is 95 000 J kg-1 and that heat exchange with the surroundings may be neglected. I was...

Help with specific rotation calculations (urgent) Homework Statement I need help determining a sugar in solution based on the specicific rotation i gained through the required calculation this was done at 589nm Homework Equations [α] = σ/cl The Attempt at a Solution...

Homework Statement A block of wood with a specific gravity of .6 with a volume of 100 cm^3 is made to just float in H2O by hollowing out some of the wood and replacing it with a substance of specific gravity of 6.5. How many grams of wood were replaced. Homework Equations Not totally...

Homework Statement The following data is obtained: Weight of ice cube added 20 g Weight of copper calorimeter 80.5 g Weight of water in calorimeter 105 g Initial temp of ice cube -18 deg C Initial temp of water 23 deg C Final temp of water 6 deg C Specific Heat Capacity copper 385 J...

can you please state some liquid which is a good heat conductor (which have low specific heat capacity)

Homework Statement A stoppered bottle, weights 38.215 g when empty , weights 45.362 g when filled with water. When filled with unknown liquid the bottole and unknown weighs 44.221 g. Calculate the liquid's specific gravity : Homework Equations D = m / v s.g.. = density of...

Homework Statement a collapsible plastic bag contains a glucose solution. if the avg gauge pressure in the vein is 12300 pa, what must be the minimum height of the bag in order to infuse glucose into the vein? assume the specific gravity of the solution is 1.02. the acceleration of gravity is...

Homework Statement To summarize, I am given 6 objects and their corresponding specific heat capacity and thermal conductivity values. All objects have the same mass. The question is asking me to rank the objects based on temperature if they are put in a hot oven until they reach thermal...

[b]1. ammonia at 20 c with a quality of 50% and a total mass of 2 kg is in a rigid tank with an outlet valve at the bottom. how much liquid mass can be removed through the valve assuming that the temperature stays constant? and from so table in the text saturated press.= 857.5kps (@20 c)...

Homework Statement Finding the specific heat capacity of an unknown metal. A cylinder was placed into boiling water, originally at 24.2 C. The heat transferred from the metal, and the water then was 29.5 C. Original Temperature-24.2 C Temperature after the metal has been placed into the...

Homework Statement alright so i have to find the density of a clay unit. I am given a specific weight of the clay as 120 b/ft^3, the gravity constant as 32.17 ft/s^2. i need to find the density of the clay, i have no problem arranging the equation below to solve for density but I am not used...

I have been able to read through up to here (middle of pg. 60). The instructions given are not clear: (I arranged the text so as to be easier to read on the page here.) "Next, let's apply rules (2.4.8), (2.4.9) Eq. (2.4.8): U(\Lambda,a)J^{\rho\sigma}U^{-1}(\Lambda,a) =...

Homework Statement A piece of metal of weight 50 grams is heated to a temperature of 100°C and then introduced into a calorimeter containing water at 14°C, the maximum temperature reached being 20°C. If the weight of the calorimeter is 5 grams, the specific heat of the metal of which it is...

Homework Statement A mass of 200 grams of copper, whose specific heat is 0.095, is heated to 100° C, and placed in 100 grams of alcohol at 8° C contained in a copper calorimeter, whose mass is 25 grams, and the temperature rises 28.5°C. Find the specific heat of the alcohol. Homework...

Homework Statement If you pour 0.50 kg of molten lead at 328°C into 2.5 liters of water at 20°C, what will be the final temperatures of the water and the lead? The specific heat of (solid) lead has an average value of 3.4 X 10-2 kcal/kg • °C over the relevant temperature range.Homework...

A bath contains 110 litres of water where 1 litre has a mass of 1kg. a) Given that the specific heat capacity of water is 4200JKg-1K-1, calculate the energy required to raise the temperature of the water from 10'C to 40'C. b) As the water flows through the copper pipes, it is heated from...

Homework Statement A fire hose held near the ground shoots water at a speed of 6.5 m/s. At what angle(s) should the nozzle point in order that the water land 2.0m away. Why are there two different angles? Homework Equations v=v0 +at v^2=v0^2 +2ad d=V0t+1/2at^2 The Attempt at a...

The specific heat at constant volume of an unknown solid is measured at high temperature to be 319.5Jkg-1K-1. Estimate its molecular weight. Cv=3R Attempt. I used the above equation to get a mass of the solid to be 0.0128kg but I have no idea of what to do next!

"What is the specific heat capacity of a 50-gram piece of 100 degree C metal that will change 400 grams of 20 degrees C water to 22 degrees C? Could someone please explain to me how to do this problem? I have to figure it out on my own because my teacher is no help at all. Thanks in advance.

Homework Statement Hello, I'm having some trouble with a lab report. I am supposed to find the specific heat of five metals but I don't know exactly how to use the equation correctly. for instance I have copper at 70.2g, the delta T at 1.8 degrees Celsius, specific heat of copper is 385...

For an ideal monatomic gas, the molar specific heat at constant volume, Cv=3/2R, where R is the gas constant. The heat capacity at constant volume of a gas is measured to be 43.58kJK-1. How many kg-moles of the gas are present? Iv tried looking in the lecture notes and in the...

Given the molar mass of Fe and the specific heat of Sn, what is the specific heat of Fe and the molar mass of Sn in approximate values?

Homework Statement Consider a linear array of N similar atoms, the separation between nearest neighbours being a. Discuss the specific heat of the system on the basis of the Debye approximation and show that at low temperatures, the specific heat would be expected to be proportional to T...

Homework Statement a crown that is supposed to be pure gold has a mass of 850g. Its apparent mass when immersed in water is 798g. (a) what is the volume of the crown? (b)is it pure gold?If not, what is the percentage by volume of gold in the crown assuming that the crown is an alloy of lead and...

I am digging back thorugh thermodynamics textbooks, and am seeing insulation values etc. but none on how to solve for time required to heat a material. Here is the specific problem. I am trying to fgure out how long its takes to cool (or alternately heat) a concrete slab. The slab is 8...

I was wondering is there any way to quantify how much "power" a given selection has on the final outcome of a voting. More specifically, say you have a sample 330,000 people and you need to pick one. However, before you get to make a choice a pre-selection is applied and the sample is narrowed...

Homework Statement The specific heat of substance X is 200 J/g*C, how much heat is required to change the temperature of 2.0 kilograms of substance X from 40 degrees Celsius to 55 degrees Celsius? Homework Equations Q=(m)(c)(change T) The Attempt at a Solution 55 C-40 C= 15 C...

There are often posts on the soapmaking forums about using one's own soap before it is cured. Curing time for soaps made with oils that solidify at room temperature is four to six weeks. For 100% Castille (olive oil) or similar, the curing time is six months or longer. Of course, we all...

Homework Statement A ball is thrown vertically downward strikes a surface with a speed of 15m/s. It then bounces, and reaches a maximum height of 5 meters. Neglect air resistance on the ball. a) What is the speed of the ball immediately after it rebounds from the surface? b)What fraction...

Hi Everyone... I'm trying to calculate the specific gravity of a sample of LNG using a compostion certificate and temperature and pressure variables of 5 bar at -134 deg C saturated. Its do perform a check for the value used to calculate how much is charged per litre by converting density to...

Homework Statement Find the slope of the tangent line using a specific formula g(x)=3t-t2 at (0,0) Homework Equations Im told to use this equation by the book f(c+deltax) - f(c) Deltax The Attempt at a Solution Everytime i plug it in by way of the books style i...

Homework Statement The specific heat of a certain metal can be determined by measuring the temperature change that occurs when a piece of the metal is heated and then placed in an insulated container that is made of the same material and contains water. Suppose the piece of metal has a mass of...

Hi, I have a question about statistical mechanics. How do you calculate the density of states for phonons and electrons in a d-dimensional system (at fixed chemical potential) and when the dispersion relation for the electrons is E(p)=A |p|^g and for the phonons is w=v|p| To get the...

Hello, everyone. Homework Statement Now, I recently did an experiment in school to determine the Specific Heat Capacity of rubber using a calorimeter. We're using the mixing method to figure it out. The mass of the calorimeter, rubber and water was measured. And the S.H.C is already known...

Homework Statement Below about 80 K the heat capacity at constant volume for hydrogen gas (H2) is 3/2k per molecule, but at higher temperatures the heat capacity increases to 5/2k per molecule due to contributions from rotational energy states. Use these observations to estimate the distance...