Capacity Definition and 664 Threads

On Wikipedia, it says: "Eligibility - Some nations restrict the franchise based on measured intellectual capacity". I've been searching on Google for a pretty long time now, but I can't seem to find the answer to what I'm looking for. My only simply and short question is: Which nations? To...

say I used a good insulator?

Q=heat capacity calorimeter*(-)change in T*moles =0.009089mol*-6.8C*4.38kj/C =-0.2707kj/mol This answer is wrong but it was the only one I could come up with right now. I just noticed units in the answer would be wrong too. Any suggestions?

Hello; What equations on mechanics can I use or study in order to measure the maximum force in Newtons the surface of the metal Steel box can hold. Details: Watch the image below, we have a metal box made of let's say steel, this box have a shape of rectangle of a thickness of for example 1cm...

Hi guys. Recently I've been assigned to know / calculate the capacity of the racks in our section. Our racks has layered steel pipes that are carrying the loads. After actual testing it can carry a load around 25 tons after yielding or having a bend. So my next step was to calculate for its...

Here's a picture of what I tried. I was wondering if this is correct?

I think the C_V for van der waals gas will be larger than ideal gas since it‘s a more precise description. However, for the relationship I cannot come up with a specific equation.

I find that $$U=\int Z \epsilon D(\epsilon) e^{-\epsilon β}d\epsilon=\frac{gV}{(2\pi)^3}\int Z \frac{(\hbar)^2k^2}{2m}k^2 (4\pi)e^{-β\frac{(\hbar)^2k^2}{2m}}dk$$ where g=2s+1=2, $$Z=e^{βµ}$$ and $$D(\epsilon)=\frac{gV}{(2\pi)^3}k^2 4\pi$$ for the density of states From here, I can use $$c_v...

Can I derive heat capacity of one phase mixture of three liquids as a sum of their mass shares multiplied by heat capacities of solitary components at given temperature? All components are miscible, of course ... thank you in advance

Not attempt

Dear Experts, We compute Cv for gases using the idea of equipartition principle and degrees of freedom. In case of a diatomic molecule, there are minimum 3 degrees of freedom (at very low temperatures) and maximum 6 degrees of freedom one of them being vibrational (at high temperatures. Does it...

"The surface of copper naturally oxidises, forming a thin hard layer on the surface which normally prevents further oxidation. " I've seen this in a book, higher level oxygen on busbar, means lower the heat and get away with ease, Doesn't it? So, Can I say a thin hard layer musn't be used?

I worked on a lab experiment that was meant to measure heat capacity but left me with some other questions. The students measured the mass of a cup of liquid nitrogen as it boiled off, recording mass vs time. Then they drop a solid object into the bath, one experiment with a small bit iron...

I am a science hobbyist and working on a paper to illustrate the impact of CO2 on Global Warming. Question – What is the Storage Capacity in joules, of one molecule of CO2 @ 20c/68f/293k. In other words, what is the maximum amount of IR energy that one molecule of CO2 can store at this...

Givens for water: m: 0.250kg of water TW : 95°C C=4180 Givens for mug: m=0.085kg TM : 19° c=107 Required: final temperature of water Analysis/Solution: Qreleased+Qabsorbed=0, q=mc▲t mw*cw*Tw + mp*cp*Tp = 0 (0.250)(4180) (T2-95) + (0.085)(107)(t2-19)=0 1045(t2-95) + 9.095(t2-19)=0...

Attempt:

liquid melting point (degrees C) boiling point (degrees C) water (H2O) 0 100 sodium (Na) 98 883 Sodium-potassium(NaK) -11 785 Lead(Pb) 327 1749 I'm prettttty sure by consulting the literature means by using the above table… but if that's the case then how in the world do you find Cv...

I want to explain to a little child (4.5 years) what the differences between volume vs. capacity. Can you give me some tips?

I am not sure that this is the right place to post this question, so I will be happy to let any moderator move it. (I would be less happy to find out that the question has no place in PF, but I would accept it.) I have been asked to make a list of American manufacturers of plates for...

Homework Statement The combustion of toluene has a ΔErxn of −3.91 × 103kJ/mol. When 1.70 g of toluene (C7H8) undergoes combustion in a bomb calorimeter, the temperature rises from 23.36 ∘C to 36.67 ∘C. Find the heat capacity of the bomb calorimeter to three sig-figs. Homework Equations q =...

Homework Statement In a certain process, a gas absorbs Q amount of heat and performs kQ amount of work, the molar heat capacity of the gas in terms of R, k and γ(Cp/Cv) is? Homework Equations U=Q+W U=nCvdT Q=CdT The Attempt at a Solution replacing U and Q with the above formulas and W from...

Homework Statement A piece of metal is heated by supplying a constant power P. The temperature of the metal starts varying as T=kt. The heat capacity of the metal as a function of temperature is? Homework Equations Q=CdT The Attempt at a Solution From Q=CdT, dT is k, since P is Q/t, I plugged...

Homework Statement Prove the following relation for which clausius equation holds : Cs=Cp-αV(ΔH/ΔV) Where Cs=∂q/∂T at constant S and is the heat capacity in the coexistence line of 2 phases Homework Equations dq=dU+dW dP/dT=ΔH/(ΔV*T) The Attempt at a Solution I do not fully understand why q...

Homework Statement We consider two capacitors with the unknown capacitances C1 and C2. If one connects the capacitors in series and applies a voltage of 100 V, finds that two positively charged plates in total have the charge 1.5 · 10-4 C. If one switches the capacitors in parallel and again...

Homework Statement 0.6 moles of pure acetic acid (no salt) is added to water. How much NaOH would have to be added to get the solution to maximum buffering capacity? Homework Equations pH=pka + log [base]/[acid[ The Attempt at a Solution HAc <---> H+ + Ac- 0.6 mol of H+ 0.6 mol of Ac- All...

Homework Statement A 4.80 kg piece of solid material is heated from 16.4C to 219C (3 s.f.) using 787 kJ of energy (3 s.f.). Assuming an efficiency of 0.383 for the heating process, and that the material does not melt, calculate the specific heat capacity of the material. Homework Equations...

Homework Statement A 4.96 kg piece of solid material is heated from 16.7oC to 234oC (3 s.f.) using 725 kJ of energy (3 s.f.). Assuming an efficiency of 0.342 for the heating process, and that the material does not melt, calculate the specific heat capacity of the material. m = 4.96 kg change...

We know that for an ideal gas the differential of the internal energy function is: dU = n Cv dT But is Cv the molar heat capacity or not?

I'm trying to figure out how to calculate how much energy is stored in a battery between certain voltages. I know capacity is traditionally calculated by multiplying amps drawn by nominal voltage by time, but this seems like an approximation because voltage decreases as the battery is...

Hello Forum, I understand that an airplane can fly when its overall weight ##W_{plane}## (force pointing down) is perfectly balanced by an upward directed force called lift ##F_{lift}##. If the lift is larger than the weight, the plane will rise in height. When the airplane is empty and...

Hi There, Why is a pipe with a smaller diameter able to withstand a greater internal pressure than a pipe made from the exact same material and wall thickness but larger diameter? Thank you

Hi all, I do an calorimeter experiment at temperatures around 40 mK. To get more grip on the time constants that are associated with the heat flows, I calculate the thermal resistance as well as the heat capitance of the materials in the set-up. We assume that Newton's law of cooling is the...

hello! I find a lot of information about the energy of sunlight per square meter in the UK region. (https://photonenergy.co.uk/new-build-solar-pv/solar-map-of-the-uk) However, these kWh/m2 must be in the form of light energy or perhaps electricity (after adjusting with an efficiency...

Need help with this I have 6 beaker of oil and 12 breaker of water, the total amount combined are 66 litres . What is the capacity of each Breaker"?

I recently received the results from my DNA tests at 23andme. I found out that I have more Neanderthal DNA than 80% of customers at 23andme. This has got me pondering the Neanderthals. My impression is that most anthropologists believe that the homo sapiens deliberately caused the...

Summary I made a vinegar battery that appears to only output .001A of current. I made it very quickly because I had to change my design for a project last minute due to my inability to get a voltage regulator in time. So it is so bad I doubt I could have made a worse battery. Anyway, the...

Does quantum computing have any profound implications for the memory capacity of computers? It's often possible to replace a large table of data by a smaller set of numbers and an algorithm that reconstructs each entry of the table using the smaller data set. Will quantum computers made such...

Homework Statement Here is the original question (just read the English version). Homework Equations Q = mcθ Specific heat capacity of water, c = 4200 J/kg °C The Attempt at a Solution I did Q_(absorbed) = Q_(released) mcθ = mcθ mθ = mθ And I solved for the final temperature, which is...

Does anyone know what the maximum capacity of a Penning Trap is or what this would depend on? Whether the capacity is measured in particles, mass, etc? I would presume that max capacity would depend on field strength of the trap, but if anyone could confirm this I'd be grateful. A follow-up...

Most hitches are rated as "X, 0.1*X weight-bearing, Y, 0.1*Y weight-distributing" where Y > X and the first number is trailer weight, second number is tongue weight. It has been described to me many times that the weight distributing hitch (with 'stabilizing/leveling' bars) "takes weight off...

Hello, I have a 1000 kva 13.8/400v transformer. I want to add additional loads to its 60% present load. The nameplate says max. ambient temp. is 55 deg. Cel. and max temp. rise is 50 deg. Cel. Can I load it to 90% continuous load after the additional capacities, and, is temp. rise equivalent to...

Air is flowing through a pipe, through a heater matrix. Flow, Inlet temperature and heater power vary. Is it possible to calculate the heat capacity of the matrix by using the Inlet & outlet temperatures, power & flow? I'm assuming no heat loss to the pipe walls to make it easier, but I'm not...

Homework Statement The constant-volume heat capacity of a particular simple system is c_v = AT^3 where A is a constant. In addition the equation of state is known to be of the form (v-v_0)p = B(T) where B(T) is an unspecified function of T. Evaluate the permissible functional form of B(T)...

I have solar panels fitted, with a capacity of 2.4 -2.5 kW. I am considering buying lithium battery storage for evening use. What would be the largest battery system I could charge from this setup?

Hello! I have to use a relay to operate circuit breaker opening/closing coil i.e. 80W @ 110VDC. Since the breaker is having some mechanical interlocks, so sometimes when the coil is operating, the breaker may not open. In that case the relay contact has to make & break the opening/closing coil...

Hi, I want to simulate a forced convection cooling problem. Air at ambient temperature is forced through a fan into a system to cool electronics and I would like to assess the temperature of the outlet air. Actually I'm interested in the delta between the ambient and outlet temperature. This...

Hello. I'm in the process of teaching myself cell bio and I'm curious to find a good source with actual rates of glycolysis in cells. In a nutshell, I'm wondering what the maximum rate of ATP production within the cell is (assuming a normal yet constant extracellular concentration of glucose)...

I read that the Tesla electric motor is able to achieve its remarkable power to weight ratio of 8.5 kW/kg, about 10 times better than a typical gasoline engine, because it tightly winds its copper wires in its coils therefore being able to carry more current in the same space. If so, then we...

Say you have an object with a negative heat capacity. This means that the object increases in temperature as it radiates energy and decreases in temperature as it absorbs energy. I don't understand why this object cannot be in thermal equilbrium with a reservoir. Any help would be greatly...

Hello! I encountered in a problem the terms heat capacity at constant volume and density (##n##) and heat capacity at constant chemical potential (##\mu##) and volume and I need to prove a relation between them. What is their definition? I thought that for the first one it would be...