Capacity Definition and 639 Threads

The task is to derive an expression for the heat capacity of a system at constant volume and show that at high temperatures it is inversely proportional to the square of temperature. As far as I'm concerned the relation between internal energy and heat capacity is: Cv=dE/dT However with...

Homework Statement 50ml of water at 49.6 C were mixed with 50ml of water at 25.1 C in a calorimeter also at 25.1 C. The final temperature was 30.1 C Assuming that neither the density of water nor its specific heat capacity change with temperature, calculate the total heat capacity of the...

Suppose that you have a http://en.wikipedia.org/wiki/Flow_network" with integer edge capacities, and n dollars. You may spend one dollar to increase the capacity of an existing edge by one. The question is, how can you spend your dollars so that the maximum flow through the resulting network...

im doing a calorimeter experiment and need to find the specific heat capacity of the calorimeter, but always gets a negative answer. Initial temp = 23 C Final temp = 60 C Change in temp = 37 C Mass of calorimeter = 0.027645kg Mass of water = 0.1kg Specific heat capacity water = 4200...

Homework Statement The capacity C of an object is the integral over its surface -\int_S \frac{\partial \phi}{\partial n} dA, where the potential φ(x) satisfies Laplace’s equation in the volume outside the object, \phi = 1 on S and \phi \to 0 at \infty . Show that the capacity of a...

if I am doing a reaction of acids and bases, do i just use the specific heat capacity of 4.18J, or is there a different one for different solutions?!?

Homework Statement The specific heat capacity of Albertsons pasta is approximately 1.8 J/g*C degrees. Suppose you toss 340 g of this pasta (at 25 degrees celsuis) into 1.5 liters of boiling water. What effect does this have on the temperature of water. (before there is time for stove to...

I've read that: specific heat capacity at constant pressure = dU-W / m. dT dU = change in internal energy W = work done m = mass of gas dT = change in temperature ----------------------------------- However, shouldn't the right hand side equate to specific heat capacity at...

Is is possible to quantify how much "space" a human brain has? Kind of like in terms of hard-drive space? I am sure this depends on the person.

Homework Statement For temperatures T >> T_C (critical temperature) derive the heat capacity at constant pressure C_P from van der Waals equation. Homework Equations Critical temperature: T_C = \frac{2N(V - Nb)^2}{kV^2} T_C is derived from the fact that it exist at the point in which...

1. Assume that a car who has a mass of 1000kg (including driver) is initially rolling freely (without using the engine) down a 30° slope at a speed of 5m/s. The brakes are used causing the car to stop after 10 m. Find the HEAT CAPACITY of the brakes if they rise in temperature by 10 K...

Hi guys, Just like to check with you: How does heat capacity, density and conductivity plays a part in the melting of a certain material. I mean, if a material has a lower heat capacity, while other factors are the same, does that mean it will melt faster compared to one with a higher...

Homework Statement Does anyone know the average pushing force a human being can exert? Homework Equations The Attempt at a Solution I did some research online but didn't find anything.

Homework Statement What is the average pushing force a human can exert? Homework Equations The Attempt at a Solution I did some research online but didn't come up with anything.

Homework Statement What is the the specific heat capacity at constant volume of Air?, with temperature 300k and pressure = 1 atm. Homework Equations The Attempt at a Solution Do I assume that this is a diatomic ideal gas and thus Cv = 5/2 ? Thanks.

Homework Statement The diagram below shows a one-dimensional row of 5 microscopic objects each of mass 410-26 kg, connected by forces that can be modeled by springs of stiffness 26 N/m (so each object can be modeled as if it were connected to a single spring of effective stiffness 4ks = 104 N/m...

Homework Statement a 4kg iron hammer is initally 700 degree celcius is droppped into a bucket containing 20kg of water at 25degree celcius. what is the final temperture Homework Equations q=mc(delta)T The Attempt at a Solution m1=4kg m2=20kg T1=700=973K T2=25=298 i know...

Does anyone know where I might be able to find the specific heat capacity of steel (in English units)? Thank you!

Homework Statement When you take a bath, how many kilograms of hot water (49°C) must you mix with cold water (12°C) so that the temperature of the bath is 36°C? The total mass of water (hot plus cold) is 191 kg. Ignore any heat flow between the water and its external surroundings. Temperature...

Hi all, I have to show that the heat capacity can be expressed as Cv = Nk(1+1/45(Om/T)^2 + ...) where the internal energy is given as E = NkT*(1-(Om/(3T)-1/45(Om/T)^2) Normally I would just differentiate but if I do this I get something completely different - how to proceed any...

Hi, I am not sure how to count the channel capacity. If a symbol represents 10 bits of information, and a channel can transmit 10 symbols per second, what is the capacity of the channel in bits per second? C = 1 - H[x] How to go from there? Thanks!

I am stuck on my Physics work. I have already completed the first 10 questions but I do not understand these, can someone please help me with a method of how to find out. 1. When 0.25kg or water at 70C is mixed with water at 20C the final temperature of the mixture is 30C. find the mass of...

is there another way of considering the specific heat capaciaty of a material (many gas) other than with respect to the number of degrees of freedom with gives a constant out put for all monocrmatic gases for all temperature and pressure. For a monocromatic gas c=(3/2)*n*R*m where m = mass...

This is not a homework question, just a question about physics that seems too basic to post in the main physics discussion forum. Please let me know if it is misplaced. Temperature is average molecular kinetic energy. Is it therefore correct to say that a material's specific heat capacity...

Chemistry/physics--molar heat capacity? Homework Statement When 5.00 J of heat are added to 1.50 g of cobalt, its temperature rises by 3.42 degree celsius. What is the molar heat capacity o cobalt in J mol-1 K-1? A) 0.710 B) 0.875 C) 2.30 D) 57.4 P.S. if your answer is A, please...

Homework Statement If 100 mL test of water at 60°C is added to 100 mL of water at 20°C, then the final temperature of the water will be? Homework Equations c=Specific Heat Capacity Specific Heat Capacity of water = 4186 Quantity of Heat Energy=mass * Specific Heat Capacity of...

Suppose there were two containers on a table, each containing a liquid with equal temperature (relatively high), density, viscosity, and volume (1-5 L). One liquid, however, has a much higher heat capacity than the other. If forced to choose a liquid and have it poured over you, which one...

I am undergrad math student, aged 20 In the last 3-4 years, I feel that my intellectual capacity has waned and don't feel as smart as when I was a kid. I seem to be fine at handling abstract concepts, but I feel slow and clumsy. My problem isn't lacking ideas, its more about concentration...

Hi! Just wondered if someone could help me. I'm trying to see if the following terminal can handle a higher than stated current at a lower than stated voltage. http://uk.rs-online.com/web/search/searchBrowseAction.html?method=getProduct&R=4458964" It's rated to I think 24A at 500V. What...

What is the specific heat capacity of HCl when given the following information: Volume: 50mL Initial Temp: 20 *C Final Temp: 26* C What is the heat measurement in Joules as well? What is the specific heat capacity of HCl when given the following information: Volume: 100mL Initial Temp...

Homework Statement We are doing a experiement where we are testing the buffering capacity of soils. The text says to use Ca(OH)2, but we only have NaOH, which i plan to substitute. I just wanted to check that the solution i make up will have the equivalent OH. Homework Equations making...

Homework Statement A tin can has a total volume of 1200 cm^3 and a mass of 130g. How many grams of lead shot of density 11.4 g/cm^3 could it carry without sinking in water? Homework Equations Bouyancy force= mass of displaced fluid*g The Attempt at a Solution no idea!

Lift anyone! Hii Everybody, I am involved in a project and I need some guidance for my design. Design Purpose: I am trying to create/find a mechanism that will provide me with up-down motion. For example think of a match-box type rectangular box that needs to be moved up-down in...

I have a question about the deduction of First Thermodynamic Law. The book that I have is written by Paul A. Tipler and Gene Mosca and it is called Physics: For Scientists and Engineers. The way to deduct it is given here: @constant volume, Qv=Cv(T2-T1) Because W=0, E2-E1=Cv(T2-T1)...

Homework Statement Use the Maxwell relations and the Euler chain relation to express (ds/dt)p in terms of the heat capacity Cv = (du/dt)v. The expansion coefficient alpha = 1/v (dv/dt)p, and the isothermal compressibility Kt = -1/v (dV/dp)T. Hint. Assume that S= S(p,V) Homework Equations...

Window-type Aircon how to get this in an actual experiment? is it just (mass flow rate of the refrigerant X specific heat X Change in temp of the refrigerant) or (mass flow rate of the air passing thru the heat exchanger X specific heat X Change in temp of the air) or (mass flow rate of the...

The question states: For an ideal gas ∂U/∂V=0. Show that this implies the heat capacity _{}CV of an ideal gas is independent of volume. I can't wrap my mind around how I could answer this question besides just stating the obvious. The expression for heat capacity is: _{}CV=∂U/∂T (with v...

hi, I am 21 years old 180cm tall and 73kg, I'm an ex smoker. I'm in the process of an army application but need to improve my peak flow. will increasing my vo2 max help and are there any other ways to increase peak flow.

[SOLVED] Specific heat capacity (Calorimetry) Homework Statement When a driver brakes an automobile, friction between the brake disks and the brake pads converts part of the car's translational kinetic energy to internal energy. If a 1500 kg automobile traveling at 32 m/s comes to a halt...

Hello, I'm having problems with this question. I'm not exactly sure how to determine how much watts in a day, or in a second the lamp takes. Homework Statement Theres a lamp that absorbs 60 W when connected to a 120-V source. Q: Find the cost of operating the lamp for 24 hrs when...

Homework Statement A copper calorimeter with the heatcapacity of 75 J/K has 300 g of petrolium in it. The starttemp. is 17.8 C. A kobberweight of 100 g. is 100Celcius. It is being put in the petroleum, where the temperature ends up being 22 C. The specifik heatcapacity of coppe ris 387J(kg/K)...

is there such thing as condenser/evaporator capacity of an aircon? how to compute for that? thanks!

can we only remember a certain amount of information, after that we can't remember more no matter what? is the capacity of mind limited?

What is the current carrying capacity of a 1000 sq. mm. 3&1/2 core alluminium cable laid in air [in case of single run, in case of double run...]??

Hi I have an ongoing dispute with my mate on this one, please help to clarify this before I open up a can of whoop ass on that sorry mo-fo. 300 litres of air are compressed into a 3 litre tank. What is the heat capacity of this air? Thanks in advance.

Hello, I'm really having trouble figuring out the specific heat capacity of solid NaOH. Any help is apprieciated. Thanks

I know working out will certainly help...as well as meditation. But what else? Is there a certain yoga, tai chi,etc. or exercise which will benefit the most?

hi, 1.please tel me in detail why do we say that for higher capacity we require more bandwidth? higher capacity means more data rate, meaning more bits per seconds(and i know BW is bps) but tell me in terms of frequencies availble in a band..coz we transmit our signal on 1 freq then what it...

HI... i wanted to do an extensive project on electricity and i thought of something. When i take a normal conduucting wire with a plastic insulation on it, and connect it in a circuit, does the insulation affect the current carrying capacity of the wire? i mean to say in one case if i apply a...

Homework Statement I'm having trouble with the following two problems: 1. A jar of tea is placed in the sunlight until it reaches an equilibrium temperature of 32*C. In an attempt to cool the liquid, which has a mass of .180kg, .112 kg of ice at 0*C is added. At the time at which the...