Capacity Definition and 639 Threads

Homework Statement Explain what is meant by the heat capacity at constant volume, CV, and the heat capacity at constant pressure, CP. How are these two properties related for an ideal gas? Why is CP generally greater than CV Homework Equations The Attempt at a Solution...

If I apply 200 J of energy as heat to 4 moles of an ideal gas at constant pressure and the temperature rises by 4 K, then the molar heat capacity at constant pressure will be Cp = Q / (n * deltaT) = 200 / (4 x 4) = 12.5 J K mol Am I on the right lines here?

Can someone confirm if my understanding of heat capacity is correct - particulary at constant volume and pressure? My understanding is that for a system to experience a rise in temperature either its pressure or its volume must remain constant. If either of these is allowed to expand...

Homework Statement A cone-shape drinking cup is made from a circular piece of paper of radius R by cutting out a sector and joining the edges CA and CB. Find the maximum capacityof such a cup. This is page#312 In James stewarts Calc book, 3rd edition by the way. Homework Equations...

Hi to our nice community. I want to learn why in a binary symetric channel the channel is calculated as C=1+plogp+(1-p)log(1-p) I only know that the channel is denoted as C=maxI(X;Y) btw what ; means in X;Y? Unfortunately my book doesn't mention these things so if u can reply me or...

I need the heat capacity Ethyl Acetate as a function of temperature. I've seen books that give heat capacity as a function of functional group, but the problem is they are only at one temperature. What I basically need is some coefficients that would fit into the equation Cp= A +BT+CT^2+DT^-2...

Hi all, I am currently in the process of writing up my AS coursework investigation of finding the specific heat capacity of Aluminium, and am a bit stuck at explaining some of my results. My results for the SHC of Aluminium are lower than the published values. My value: 700.93 JKgC...

I need to find the heat capacities of CO2 (g), CH4 (g), C3H8 (g) , HCl (g) Al (s) , Ag (s) , Ti (s) if anyone can post a link or let me know what the heat capacities of these substances are I'd greatly appreciate it

Is my assumption here true? Does having a higher specific heat capacity mean that the object will be a better conductor of heat?

Homework Statement My teacher instructed my class to conduct an experiment to determine the specific heat capacity of Brass, Copper, Aluminium, and Steel. The following setup was used: http://mypage.bluewin.ch/gutter/diagram1.JPG The following method was used: 1.) The electric heater...

Homework Statement The temperature of a brass cylinder of mass 100g was raised to 100 degree celsius and then transferred to a thin aluminium can of negligible heat capacity. The aluminium can contained 150g of paraffin at 11 degree celcius. If the final steady temperature after stirring was...

help! need help here because my answers are different from the answer on the book. just wanted to make sure that i am right. these are the problems: 1. How much heat is needed tor aise the temperature by 10 deg celsius of 5 kg og a substance of specific heat capacity 300J/kg deg celsius? what...

Hi, I would like some help/orientation about heating furnaces. The issue is around the heating of steel billets (continuous cast billets). The furnace needs to heat a load of 104 billets placed face to face along its longitudinal axis from ambient temperature to ± 1,150°C. Each billet has...

I am designing a cracking furnace to crack Ethylene Dichloride. the furnace is at around 500 C and 2 M Pa. To perform an energy balance I need the specific heat capacity of the EDC at the aforementioned temperature and pressure. I can only find it at standard conditions and can find no way of...

I am desinging some experiment using a 9Ahr, 12 V as the power supply. I am not sure how many percents of the energy the battery can supply. For example if my experiment consumes a current of 0.1A, then how many hours the battery can be used?

My thinking is, when a fairly non-periodic, non-polar compound is subjected to an electric field, dipoles emerge, and although they're all in the same direction, since the arangement of atoms in the substance isn't that regular, then the electric field inside will be non-uniform (on the...

I am a beginner in thermodynamics; all I know is how heat is transferred, rotational/translational/vibrational/internal energy, and the law of conservation of energy. I recently learned about specific heat capacity, and I was wondering: why is it that different substances convert varying ratios...

Homework Statement does the length of the fuse wire influence its cpacity? why? Homework Equations R=pL/a The Attempt at a Solution My teacher said no. I think it should because R depends on L Thanks for your time.

What is the difference between a 74min and 80min CD? I was just recording to my scratch CD and noticed that it had passed the 645Mb limit of a 74min CD, therefore it must be 80min. I base a CD's capacity on how wide the unwritten stripe is, but I wondered how the CD Writer knows the...

Hi. Was wondering if anyone knew where i could find a list of the metals and their specific heat capacities. All i have found is this one: http://www.engineeringtoolbox.com/specific-heat-metals-d_152.html but i would like one that deals with all the metals Thanks

I'm stuck on some basic physics... I'm using the formula E=mc (delta T/delta t) where E is energy, m is mass, c is specific heat, T is temperature and t is time, to calculate the energy used in heating a volume of air to a certain temperature. Assuming that pressure is of that at sea...

1. A heat engine is run with a large block of metal as a reservoir with initial temperature T_i and constant heat capacitance C. The ocean is used as a cold reservoir, with constant temperature T_0. What is the maximum work that could be done by the engine in terms of T_i T_0 and C 2. C =...

The problem of being competitiev with batteries for sorage capacity may be licked! The Ford-MIT Alliance has deveoped a http://web.mit.edu/erc/spotlights/ultracapacitor.html" tat might be a viable replacement for batteries. It should be ready for market in five to ten years, and Hybrid vehicle...

Homework Statement Use the thermodynamic identity to derive the heat capacity formula C_V=T\frac{\partial{S}}{\partial{T}}_VHomework Equations C_V=\frac{\partial{U}}{\partial{T}} T=\frac{\partial{U}}{\partial{S}} dU=TdS-PdV+\mudN The Attempt at a Solution I used...

Homework Statement Hi,so iv tried the following question and think my general methodology is correct but the final answer i am getting is wrong.ne ideas? Homework Equations Question:a styrofoam cup contains 200g of water at 20 degrees celsius.What will be the equilibrium temp of the...

I am currently re-reading an old textbook on thermal physics and they have listed the final result for calculating the Debye Heat Capacity as C =9R(T/ThetaD)^3*Integral((z^4*e^z dz)/(e^z-1)^2, 0-->ThetaD/T) But they fail to mention what the R in this equation is, Could some one please tell...

i want to know how can i determine the capacity of a boiler needed to generate steam which will be used in order to heat water. take into consedration that i know the flow rate of the water and the inlet and aoutlet temprature to and from the exchanger.

I'm in a situation where I need to adjust for heat loss, and am at a loss because my "comprehensive" data booklet isn't comprehensive enough. Could anyone please look up the specific molar heat capacity of cyclohexanone for me? Thanks in advance.

Hi veryone this is my first post... i am given with 2 datas-they r load capacity=250 kg; Dry wt of vehicle=150kg...I have a doubt...when we r calculating the power of an automotive engine, which wt. shud be taken for calculation...or should we takje the sum of them?:confused:

This questions puzzles me: Which has a larger specific heat capacity (shc) : solid, liquid or gas. We can assume that it is of the same matter. Why? I have checked the numbers. Only water has it on all three states. Liq water has the highest, while that of ice and steam is about the same...

I have to write about the applications/uses of specific heat capacity. I know what SHC is- the amount of heat required to raise the temperature of 1kg of substance by 1°C/ 1K. But I have no idea how that can be applied anywhere or anything.. I've searched the entire internet for the...

I have tried to work out how fast and how long a 50 man rowing crew could go, i think it not only depends on muscle bulk but also lung capacity, this is in relation to a 12 century ship, i have little idea of the ship design but i thought if i knew the rowing capabilities of the said crew i...

Hey. Here is the question i was given: "When you hold your hand in the air in a hot oven, it takes a while before it starts to burn, but if you touch a cake tin in the oven, it burns almost instantly. Why?" It has to do with the lower specific heat capacity of the tin, which apparently...

Hey. Here is the question i was given: "When you hold your hand in the air in a hot oven, it takes a while before it starts to burn, but if you touch a cake tin in the oven, it burns almost instantly. Why?" It has to do with the lower specific heat capacity of the tin, which apparently...

Chemistry question: Grade 12 stuff (Heat energy) So we're going to have a lab soon, and its goal is to find the heat energy value (Q). We're going to take a beaker filled with water, record its mass and initial temprature, and then bring a really hot iron washer inside and record its final...

This is CALORIMETRY PROBLEM. A 0.050kg metal bolt is heated to an unknown initial temperature. It is then dropped into a beaker containing 0.15kg of water with an initial temperature of 21.0 C. The bolt and metal then reach a final temperature of 25.0 C. If the metal has a specific heat...

:confused: Hey ya, I need to design 3 different experiments to find the specific heat capacity of a metal block. I have got 2 but am just stuck for a third. The two i have are: Method of mixtures Heat up metal block in a water math, transfer to a cold water bath and observe the temperature...

Hey ya. I need some help with specific heat capacity. :cry: Does anyone know where i can find a table of specific heat capacity values? :redface: Also what are the units of specific heat capacity? do you have to measure the temperature in kelvin or degrees? Plz help, o:) Thanx

What is the smallest amount of solid NaOH that will exceed the buffer capacity 500mL of a buffer that is 0.4M in acetic acid and 0.15M in NaOAc? a)5.69 b)5.16 c) 4.74 d) 4.31 e)3.00 grams Since this is a strong base, we only need to deal with the 0.4M of acetic acid. so 0.4M *.5L =...

:confused: Hello I am a high school student and I am doing a Science Fair project on... something... anyways, I really need to know the Specific Heat Capacity of Sodium Acetate please, if anyone knows can you help me, or at least show me some websites, I have searched on Google and in textbooks...

This is for a lab I have done and I am stuck on this, Question : Plot a curve of In (1 - V/Vo) vs time and calculate C from the slope of the line. Initial equation = V = Vo(1-e^-t/RC) Calculated Linear Equation : In (1 - V/Vo) = -t/RC Therefore from y = mx + b = m = -t/RC (i think)...

Hi, I have decided for my advanced level coursework to investigate whether the specific heat capacity of a few metals affects their resistivity in any way. (prob in a circuit) I am at the stage of planning and i have less than a week to complete this stage. I have a few ideas about measuring...

Hello guys, well its that time of the week when I am busy working on my homework again! One of this weeks questions is that there are 2 hollow concentric conducting spheres which hold charges Q1 (inner shell, radius R1), and Q2 (outer shell, Radius R2 ) 1) Find the potential difference...

Hi. I've just started a course on statistical physics and the first assignment is this: A system possesses 3 energy levels, E_1 = \epsilon, E_2 = 2\epsilon and E_3 = 3\epsilon. The degeneracy of the levels are g(E1) = g(E3) = 1, g(E2) = 2. Find the heat capacity of the system. I've...

I have a room that is V m3. If I heat up the room a certain temp, then let it cool, and I measure the temp drop rate to be i.e. 10K in 2 hours. Then I use the following equation: \dot Q = C_P \cdot V \cdot \rho \cdot \dot T This gives me Watt value, but I'm not excactly sure what it...

What could happened to heat capacity of solid material if Plank's constant value could be 10 times greater. If Some one knows please help me.

we need to show that the heat capacity of thermal radiation at constant pressure is infinity. I have an argument, but am not sure if it works. we know that Cp = dQ/dT at constant p, but we also know that p is a function of T only, and therefore that T is a function of P only, therefore if...

I need a bit of help here guys :D I have a something here that's effectively a battery that can supply around 1.5V I believe at a few micro-amps to a few milli-amps for an unknown amount of time. The problem is... they are all infact unknown quantities and I want to figure out what this...

I'm just checking that it's okay to use Cv all the time as a heat capacity of an ideal gas, even when the volume's not constant. This is because the average energy per molecule is 3/2*Kb*T from kinetic theory, therefore the average energy per mole is equal to 3RT/2 = CvT etc. I'm currently...

I'm having a hard time getting my hear around this question. Help would be appreciated as my revision books are not helping. I'm not looking for answers (would be helpful) - just help that will actually be of use to me if I get this question in the real exam. Two physics teachers are getting...