Internal Definition and 993 Threads

Thermodynamics--work, heat, & internal energy Homework Statement When a system is taken from state i to state f along path iaf in Figure 18-41, Q = 60 cal and W = 20 cal. Along path ibf, Q = 51 cal. Fig. 18-41 (see attatched) (a) What is W along path ibf? (b) If W = -13 cal for the...

Homework Statement Does the molecule in the file attached have an enantiomer? Homework Equations The Attempt at a Solution I think I can draw an internal symmetry plane to divide the molecule into 2 equivalent parts, but then again, it doesn't seem quite right to me. Building...

How can I find the temperature of something if I'm give the internal energy(U), volume(V), and number of moles(N). I thought it'd just be pv = nrt but I am not sure what to do with the internal energy or how to use it with pressure. Thanks.

I'm currently studying A2 physics and I'm stumped on a particular question within a past paper involving internal energy of air. The question is as follows: Estimate the internal energy of the air in a room of volume 24m^3 at a temperature of about 20˚C. Assume that the air behaves as an...

Homework Statement Ok, you'll have to bare with me on this problem, this topic is not covered as part of my second level education. I think that ye do this in the US though. You are given a circuit containing a non-ideal power supply, an NTC resistor, an ammeter, a voltmeter, and a switch...

How do the angle of incidence relate mathematically with the angle of reflection after the critical angle, that is, in a TIR? Say we have a person standing at the bottom of a swimming pool, if we take the n for water as 1.33 and for air as 1, we get the critical angle of 48.75 degrees. When the...

Homework Statement The problem is that there are two , two-state paramagnets with Na = Nb (number of dipoles in each). uB = |kT|, energies of each dipole are + or - uB. Different internal energies to start, but they are brought together at thermal equilibrium and I need to find the average...

Does a battery really have any internal resistance? If it has then what's the origin of the resistance. We know that the electrons flow from negative to positive terminal of a battery. Do the electrons just end up releasing energy(such as heat) at the terminal/ or combines with the atoms of the...

The gold nucleus has an atomic mass of 197 with 79 protons and 118N and 79 electrons. The top quark has about the same mass, but no internal structure. It's just a particle with pure mass. Why would a structure of pure mass and nothing internal decay?

I have two different circuits and I need to work out the internal resistance of the cell. So far I have got to 0.8(5+r)=1.2(2.5+r) Where do I go from here?

Can anyone tell me if Internal\ Energy + Pressure * Volume equals heat, total energy, energy in transit? What if all energy is assumed to be in transit (heat all the way down)? Would that mean all energy is heat? I tend to think so for the following reason: In a "complete" system (with...

Hi, I am trying to do coursework on measuring the internal resistance of a solar cell. The light intensity on the solar cell is not going to change so the only thing that can be changed is the resistance as a variable resistor is used.But I am not sure how to find the internal resistance when I...

ok so DELTA U = Q - W Where U is internal energy, Q is heat transferred from or to the system and W is the work done BY the gas right? I always mix up U and Q, the concepts. My teacher said U depends entirely on temperature, is this right?? Also, if Q =ncDELTA T, isn't Q also dependent on...

URGENT! Please help! Circuit analysis (Thevenin voltage and internal resistance) Hi guys, I am really stuck on this portion of my lab and it's due tomorrow! Please help! I have two questions: The first deals with the diagram from the left of the attached picture. I have to prove that...

Ok, I must admit that I am becoming a bit confused about these concepts. I understand that enthalpy is u + Pv, and entropy has something to do with molecular randomness. I was fine until we started to solve for heat transfer when dealing with entropy and now I am confused, sometimes we use...

Are there any good sources anywhere for detailed info on how SPICE simulators work internally? I'm interested in learning more about how spice actually goes about its calculations, thanks.

Here is the question I need to solve: A battery has an emf E and an internal resistance r. When the battery is connected to a 25 ohm resistor, the current through the battery is 0.75 A. When the battery is connected to a 53 ohm resistor, the current is 0.45 A. Find the emf of battery and...

i recently heard that ups is designing and testing a hydraulic system to power a torque converter for an efficient delivery system i need to know the validity of the situation and the plausibility of it being run by an electrically powered motor.

I'm doing a few practicals at home this summer, and the one that is bugging me is about EMF. I have measured voltage and current at different resistances across a 4,5 V battery, and made a graph. But to find the emf, am I supposed to take the slope of the graph, or the gradient? Or is that the...

I need a little starter on this one...can't figure out how to do it(or even start it)...I'll work it, if I can get some help along the way... Two moles of an ideal gas at 20 deg C undergo a free adiabatic expansion from 2.0 liters to 66 liters. Then the gas is adiabatically compressed such...

Sir, I have a doubt. The internal energy U is a unique function of any state because change in U ___________. I think the answer is internal energy U is a unique function of any state because change in U does not depend upon path.U is a point function. But the given in book is " U depends...

Hi I wanted to know : - Most gases increase in temperature when they are compressed . Where does the energy for this come from . When a change of state from liquid to gases occurs is it accompanied by change in the internal energy of the liquid molecules ? Thanks a lot ..

Hi all, I'm stuck on a question, and I'm hoping you guys can help... Anyway, here it is: A J-shock in a Herbig-Haro object is propagating through neutral hydrogen gas at speed 100 kms-1. The gas has number density 107 m-3 and temperature 104 K. (d) The internal energy per unit mass of a...

These circuit questions seem to give me so many problems, this question in particular. What are the emf and internal resistance of the battery in the figure below? I have the answers, that emf is 9V and internal resistance is 0.5 ohms, however I'm having problems getting there. What...

Hi, I want to know, how we calacute the internal resister for the wire. what is the formula for it, and plase give me the constant for lead matel. to find the internal resister for it.

In this equation I r= E-V/V*R How would I find R? thanks in advance you your help.

A worker drives .5 kg spike into a rail tie with 2.50 kg hammer. Hits spike with 65 m/s. 1/3 kinetic energy converted to internal energy. Find increase in total internal energy. The problem I have having with this problem is that I don't know how to deal with the masses. I know PEi + KEi +...

hello I just realized I'm having some trouble figuring out the relationship between conservation of momentum and kinetic energy and internal energy in isolated system. We learned that total momentum gets conserved if two object collide in isolated system. But when learning about...

1. Cylinder contains 0.1 mol of ideal gas at a pressure of 2 atm and temperature of 300 K. The volume of the cylinder is 1.25 x 10^-3 m3. When the gas is heated from 300K to 350K, what is the change in internal energy of the gas? --->(I think the equation is Q=delta U + W but I don't know...

hello How does macroscopic kinetic energy KE get transformed into internal energy? Car bumps into trash can and small dent is made in the car.Dent is caused by force from trash can over certain distance (i.e. car gave part of its KE to trash can and trash can gave part of its KE back to...

hello First question-Internal energy W(I) of an ideal gas consists only of internal kinetic energy (thermal energy) W(KE). W(I) = W(KE) If at temperature T there are N molecules in an ideal gas,then total W(I) is W(I) = N*3/2*k*T We see from above formula that W(I) of ideal gas...

i figured out that Wac=21000J Wbc=0 Wab=91000J how do you find internal energy of U=Q+W?

hey so I'm doing this question on total internal reflection and have got myself totally lost here is the question: what is the smallest angle \theta(1) for which a laser beam will undergo TIR on the hypotenus of this glass prism? after reflecting off the hypotenuse at \theta(c) the...

Bremsstrahlung is the process in which an accelerated electron radiates and loses energy in the form of a photon(production of continuous X-rays). In photoelectric effect, an atom absorbs a photon and an electron from one of the shells is ejected. So, is it reasonable to regard X-ray...

Q) A 3 g bullet traveling at a speed of 400m/s enters a tree and exits the other side with a speed of 200 m/s. Where did the bullet's lost KE go, and what was the energy transferred? This is an example prob from my book which says: Change in KE+Change in Internal Energy=0 Hence, Change in...

It'd be best if I start with example. Screwdriver helps us by having a handle with a large radius that provides a mechanical advantage in turning a blade with a smaller radius. So whatever force exerted on screwdriver's handle by hand, same force is exerted on screw. But torque on a handle is...

Hey guys ,can u just let me know about the most advanced or developed IC engine.Plz help.

alright, so I'm reviewing for a test I have on monday, and I was given a study guide which we must answer in order to get ready for the test. Now I just breeze through this stuff like its nothing, but I've found on discrepency. I even looked up the question online and i got 2 completely...

930.J of work are done by an insulated system that absorbs 3.35Kcal of heat. What is the change in the internal energy of the system? Ok so I don't quite understand this. I know that U=Q-W. but I do I just do 3.35Kcal minus W? This just doesn't seem right.

A cylinder contains 0.0100 mol of helium at T = 27.0 ^\circ \text{C}. If the presure of the helium is kept constant, how much heat is needed to raise the temperature from 27.0 to 67.0 C? If the gas is ideal, what is the change in its internal energy? I got the answer for the first part...

Question: When a quantity of monatomic ideal gas expands at a constant pressure of 4.00 \times 10^{4} {\rm Pa}, the volume of the gas increases from 2.00 \times 10^{ - 3} {\rm m}^{3} to 8.00 \times 10^{ - 3} {\rm m}^{3}. A. What is the change in the internal energy of the gas? It's isobaric...

I know its because the electrons stop the current but that's about all i Know! Any ideas also does internal resistance vary from rechargable and non rechargable batteries? thanks :D

Hi, I am in yr 11 and i study physics I am my free time but have stumnbled across the following question that i can't seem to find an answer for in any books, would someone please be able to help me? A cell is connected in series with a variable resistor. A high resistance voltmeter is...

I figured there must be a relationship between internal energy and enthalpy after doing this physics question sheet which seemed to suggest this because there was a graph (pressure-volume) showing 2 routes to same finial condition...which reminded me of la chatelier's principle (think that's the...

A tank of volume 0.413 m3 contains 2.79 mol of helium gas at 5C. Assume that the helium behaves like as an ideal gas. The universal gas constant is 8.31451 J/Kmol, and Boltzmann's constant is 1.38066 x10^-23 J/K. Find the total thermal energy of the system. Answer in units of J. Would...

problem says knowing radius of each pulley to be 7.2 in, neglect friction, find internal forces at point J of the frame. 1st question that I have is whether the tension in section C-E of the cable also 90 lb? how about section C-D. Also, in my diagram of each of the members, I don't know how to...

A cylinder (cross section is 0.2m2) with a free moving piston is filled with gas. The piston is attached to a heavy weight W = 10000N. Outside the cylinder, the air is at 300K and 1atm. Initially the gas is at 300K, then it is heated to 400K. The heat capacity of the gas under the constant...

Hello everyone, I keep missing his problem! and i only have 2 more trys... When the lights of a car are switched on, an ammeter in series with them reads 14.0 A and a voltmeter connected across them reads 12.0 V (Figure 27-48). When the electric starting motor is turned on, the ammeter reading...

One of my problems reads, 1. Determine the maximum angle for which the light rays incident on the end of the pipe in Figure P35.38 are subject to total internal reflection along the walls of the pipe. Assume that the pipe has an index of refraction of 1.40 and the outside medium is air...

In an SI engine, according to the book Internal Combustion Engine Fundamentals, knocking is produced due to the interaction of the shock wave and the expansion wave which together produce very high amplitude standing waves. My question is, in knocking is there only one shock wave or multiple...