Capacity Definition and 639 Threads

Hi, First time user here. I was hoping someone could help me calculate the CFM of air needed for an Air Compressor to air-clean 16 tubes. The Compressor is connected to a header that has 116 PSI of Pressure. The header is connected to 16 thin pipes that have nozzle tips with a 1.5 inch...

I am trying to understand the nature of the dependence of heat capacity/specific heat on pressure. I understand that one may give the the following relations: \frac{C_p}{C_v}=1+\alpha\gamma T where C_p,C_v,\alpha,\gamma, and T are isoberic specific heat, isochoric specific heat, thermal...

Homework Statement what is the significance of having a high vital capacity? Homework Equations The Attempt at a Solution You can breath more effectively, more air/breath?

hello, I'd like to know if there is any heat capacity database of some common substances. I've searched the internet for a while and I haven't found anything so it would be really kind if someone could provide me this data or link/refernce to it, because now I really need it for a project...

I am looking to find the maximum psi or atm capacity of a tungsten tube of 99.9% tungsten. How would I do this?

Calculate Specific Heat Capacity HELP! Hi guys, I having big troubles with how to calculate the specific heat (cp) for refrigerant r134a i gas phase. I think that assuming ideal gas behavior is a bad idea since this is going to be used in a actual system... I have values of entropy...

Homework Statement Hello everyone! I'm using the text: "Elements of Solid State Physics - JP Srivastava (2006)" I have followed the argument leading up to the derivation of the Debye formula for specific heat capacity, so we now have; C_V = \frac{9N}{\omega_D^3} \frac{\partial}{\partial T}...

Why does the specific heat capacity of an object changes with temperature?Please explain in detail.Thanks..

Homework Statement A 100.0 g copper sample (specific heat 0.385 J/g K) at 100 C is added to 50.0 g of water at 26.5 C. What is the final temperature of the copper-water mixture? Homework Equations q = q(copper) + q(water) q = (heat capacity)(change in Temp.) q = (specific...

Homework Statement A student performs an experiment on an ideal gas by adding 42.0 J of heat to it. As a result the student finds that the volume of the gas changes from 50 cm3 to 150 cm3 while the pressure remains constant at 101.3 kPa. i) If the quantity of the gas present is 0.007...

Homework Statement I am given the amount of moles of gas, how many joules of heat I put into the system, and a positive change in temperature. Then it says "calculate the molar heat capacities at constant volume and constant pressure of the gas." Homework Equations q=CT, C(constant...

Wasn't sure if this was the right location for this, but seemed more electrical engineering based. Just doing tutorial exercises WHICH I CANNOT EVEN FIGURE OUT WHERE TO START. -Town Population - 100 000, average 4 people per household -Average consumption per HH - 2kW at all times of the...

Homework Statement Here is the equation I am given. I'm supposed to find the carrying capacity. dp/dt=.05P-6.6666667e-5P^2 I know the general solution is rp-rp^2/k with k=carrying capacity, but the addition of the middle term has thrown me off. The Attempt at a Solution I tried...

dQ = nCvdT if volume is constant. However, n = pV/RT. What I don't understand is, why are we thinking n as constant when doing the integral? I had two problems that involved this on a test I had today. At first I kept it constant and then changed n. But then I thought, wait... isn't there a T...

I have wire of 1.5 mm2(Flexible). Now i want to measure it's current carrying capcity how i can measure it's current carrying capacity?

can we determine a specific heat of a sample by cooling it to the temperature of ice rather than heating it to the boiling point of water?

a pump capacity of 10 m^3/hr at 30 meters head. what does the 30 meters head mean? thank you..

Homework Statement Give an physical explanation to why the specific heat capacity goes to zero as temperature goes to zero. Homework Equations The Attempt at a Solution I was simply thinking that around absolute zero the average kinetic energy of the particles should be zero...

First post, simple question. Oddly enough, there is great dissention amongst my circle of friends as to just what forces are at work here. Of note, neither myself nor my friends are electrical engineers . . . . . obviously. I have a power source. . . . . . say 110 V AC. I have a 12 gauge...

Hello, would someone know where can one find tabulated values for the heat capacity of air c_{p} or the ratio \gamma = c_{p}/c_{v}? I need those at low temperatures and pressures, e.g. tending towards zero. So far I was only able to find \gamma tabulated for high pressures in Perry's...

Hello Forum, the "maximum" data rate that can be used over a physical "noiseless" channel is given by bits/s= 2*B* log2 M where B is the channel bandwidth (set of frequencies that are passed with little attenuation), and M is the number of levels we can change the chosen parameter of...

If a nuke units has a DNC of 1000 MWe, is this capacity per sec, hour, day, or year? I'm "assuming" this capacity is per hour but then again a Watt is a unit of seconds. In other words, If a nuke unit has declared net capacity (DNC) of 1000 MWe, how long would the unit have to run at...

What scientific tests can be made to test what are my (or anyone else) memory capacity? And how do you measure our brain's memory capacity, what measure units do you use? is it like in PC with RAMs or SDRAM or what not?

Homework Statement In an experiment to measure the temperature of the flame of a Bunsen burner, a lump of copper of mass 0.12 kg is heated in the flame for several minutes. The copper is then transferred quickly to a beaker, of negligible heat capacity, containing 0.45 kg of water, and the...

Hello, 1. How can I calculate the heat required to raise the temperature of Carbon dioxide. It is at -40C and then it is to be heated to 50 C... The operating Pressure is above critical, so when it crosses the critical temperature point, the liquid CO2 would change into super critical state. (I...

Can a compound have a high specific heat capacity and be a good thermal conductor, or are these properties mutually exclusive?

I once saw three very large transformers in a fenced area smaller than a typical substation fencing. They were close enough to read some numbers on a metal nameplate which gave a list of about 6 primary tap voltages in the 12000 to mid 13000 volt range. There were some other stamped numbers...

So our teacher wants us to find the temperature of a flame of a bunsen burner. To do so, he told us to do the following: Heat an aluminium block of known mass (160g), but unknown initial temperature. Drop it in a beaker with 500 ml of water, of known temperature (22 degrees) and let the...

Homework Statement Hi there. I'm having some trouble on solving this exercise, which you can find on Callen 2nd edition. A simple fundamental equation that exhibits some of the qualitative properties of typical crystaline solids is: u=Ae^{b(v-v_0)^2}s^{4/3}e^{s/3R} Where A,b, and v0 are...

Homework Statement in the absense of bearing friction a winding engine would raise a cage weighing 1000 kg at 10m/s, but this is reduced by friction to 9 m/s, how much oil, initially at 20 C is required per second to keep the temperature of the bearing down to 70 C (specific heat capacity...

the difference between the entropy and the heat capacity? they are very similar! hello ... as we all know that specific heat capacity = joule/ k entropy = joule/k they are same in units Q= m Cv dT Q/dT=m Cv...1 dS= dQ/T ...2 from 1 & 2 dS= m Cv .....??… I'm now confused...

I am doing a lab about specific heat. i have a cup of boiling water which i put 5 metals into, and a cup of warm water which sits at 22 degrees celcius. i am to record the difference in temperature as i am using the equation Q = mc (delta) T for part one, and then i am using the equation C = Q/m...

Homework Statement How can you calculate the specific heat capacity of an unknown metal? In my question the metal with a mass of 50g and a temperature of 200 degrees celsius was placed in 125 g of water with an initial temperature of 20 degrees celsius. After the simulation and the metal...

Homework Statement This was a LAB assignment. I need to find the specific heat capacity of a given metal (Cu in this case) in water, I have the following observations. Mass of water: 249.14g = 0.24914 Kg Initial temperature of water: 18 C Initial temperature of metal: 100 C Specific heat...

Homework Statement [/b] Debye considered atoms to oscillate from 0 up to a nu max. It is explained further in the text that the complication (i.e., not all atoms oscillating at same frequency as shown in Einstein's formula) is accounted for, by averaging over all the frequencies present...

I would like to ask why the cooling capacity of air-conditioner is 2-3 time more than the work done by the compressor?? According to the conservation of energy, the amount of work input should be equal to the amount of heat absorbed(cooling capacity), isn't it?? Can anyone explain it...

Homework Statement Given the perfect gas molecules with permanent electrical dipole moment u in the field \epsilon. The potential energy is U = -u\epsilon\cos\Theta Derive the additional effect of \epsilon on the heat capacity. I need some hints, please help. Thanks.

Homework Statement 1. Calculate heat lost by the hot water in the calorimeter. Initial temp: 22.90 C Finial temp: 23.25 C Density: 1.00 g/mL specific heat capacity: 4.18 J/gK Homework Equations qmetal=-(qwater+qmetal) q=m C dT The Attempt at a Solution When i use the second...

I understand that the heat capacity of something run at constant volume is lower than at constant pressure, as at constant pressure the substance can expand, so some of the energy put into the system is used for work. If i have two identical systems and heat them under constant pressure...

Homework Statement The total capacity of the pool is 1000 cubic meters. the filling of the pool started on Thursday morning at 6 o’clock. On Friday morning at 9 o’clock when the pool was being filled, the pump for removal of water was started by mistake. Starting from this point onwards, water...

We have the parameters,current =10^-3A,V=15kv,number of electrons=6.25 X 10^15,velocity=7.3 X 10^7,specific heat capacity of the liquid=2 X 10^3,c=3 X 10^8,h=6.63 X 10^-34,mass of electron = 9.11 X 10^-31. Now the question says,in an x-ray tube having those parameters,find the rate at which...

Homework Statement 1.0 g of water at 28 degree celcius is placed into a 200g aluminium can at 300 degree celcius. What is the temperature of the aluminium can after all the water vapourises? Given the specific heat capacity of aluminium, 900 J/kg/degree celcius and water, 4200 and specific...

Homework Statement This is a problem I made myself and it's really confusing me. You have 100mL of water and place it in a calorimeter of low specific heat capacity. You put another 100mL of water in another calorimeter of high specific heat capacity. Assume in both instances that the water is...

Hello PF, Is the following calculation correct for the amount of time it would take to raise the temperature of a given mass of material? Q = heat in J W = watts m = mass in kg c = specific heat in J/kgC Tf = temperature final Ti = temperature initial Q = m * c * (Tf - Ti) m = 5...

1. Propane vapour (1kmol) at a pressure of 40 bar and 230 C expands adiabatically to 0.25 bar and 95 C. Determine a)W, b)Delta S, c)The amount of work obtained if the expansion were done reversibly from the same initial conditions to the final pressure of 0.25bar 2. I am not sure how to...

I have a problem understanding how we can say that an object has energy of x joules because energy depends on the frame of reference right ? I mean let say a bird is moving with velocity of 5 m/s if I were a stationary man I would observe that it has a kinetic energy but if I were moving with 5...

Hi, I have read Lift-it catalogue and I found out it is very professional and useful . I have some questions in the subject and I'll be grateful for professional answers. I found out that there is a direct relationship between SWL and the width of the strip (1600 lbs/in of width for nylon...

What is the carrying capacity of Earth? How many human can be supported with the current level of technology? What level of standard of living should we aim for? Is over shoot possible? I have no computer model to study so I can not answer the first two questions. I would like to have at least a...

This is not a serious question, but I think evolution has given them too much advantge by allowing them to fly as well. I mean they are bad enough without fying. Also do they get tired when flying, they don't do it very often.

Homework Statement The question asks whether it is always true that dU=C_VdT and their answer is no, because from the 1st law of TD we derive that: dU=C_VdT+\left(\frac{dU}{dV}\right)_TdV However, if we hold the volume constant, dV=0 and therefore the second term disappears, is this...