Internal Definition and 993 Threads

Homework Statement Two moles of carbon monoxide (CO) start at a pressure of 1.2 atm and a volume of 30 liters. The gas is then compressed adiabatically to 1/3 this volume. Assume that the gas may be treated as ideal. What is the change in the internal energy of the gas? n = 1.2 atm V2...

Homework Statement From the beginning of chapter 21 Haliday, Resnick and Walker: `Suppose that you return to your chilly dwelling after snowshoeing through the woods on a cold winter day. Your first thought is to light a stove. But why, exactly, would you do that? Is it because the stove...

Hey I am very new here (litrally signed up 10 mins ago after trying to search the net for this problem) heres what it looks like in my c/w so far I've worked out the total resistance of the open circuit but the next question is asking i attempted to use ohms law but that would of been...

Internal and thermal energy vs Temp? Hello I am a layman who is seriously trying to grasp the concepts and principles of physics to understand the workings of the world. I have seen the equations for deriving Internal Energy and Thermal Energy but lack the math to apply them or be sure if...

how to find the point in the cylinder where kinking will form ?

Homework Statement Compare the Internal (or Thermal) energies of the different containers sketched below. Choose the correct ranking of the internal energies provided. Each container contains H2 molecules with the shown amount (the number of molecules) at the same temperature. a) A=B=C=D...

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...

Boiling Internal Energy - URGENT A quick question: dU = dQ - dW What are dU, dQ and dW during Boiling? I thought: -the particles do work, hence dW is + -dU increases as particles gain more energy so dQ = dU + dW - showing that heat flows in. Which made sense to me. Or is...

Is there a theory about the relationship, a ratio perhaps, for a Black Hole's event horizon dia. and its actual internal mass dia.? It would seem that there must be a physical mass in there somewhere, of some particular size for a given mass. This ratio may vary proportional to the mass of the...

When switch S in the figure is open, the voltmeter V of the battery reads 3.07 V. When the switch is closed, the voltmeter reading drops to 2.95 V, and the ammeter A reads 1.70 A. Assume that the two meters are ideal, so they do not affect the circuit. Find the value of the emf. (see picture...

Hi all, Why the probability of knocking out k-shell electron in internal conversion is higher? Please don't mention here that k-shell is nearer to nucleus. Thanks

Hi all, I'm am reading chapter 3 of Tinkham's "Introduction to superconductivity". At some point several thermodynamic quantities are considered (sec. 3.6.3). In particular fig. 3 compares the internal energies of the superconducting and normal states, showing that they are different below...

Homework Statement A battery consisting of six cells in series, each of e.m.f 1.5V and internal resistance 0.5 Ohms is connected to two 3 Ohm resistors which are in parallel. Calculate: a) the total parallel resistance of the combination [1.67] b) write down the internal resistance of the...

Homework Statement A torch bulb is marked 2.5V and 0.3A. When it is connected to a dry battery of e.m.f 3.0V the correct p.d of 2.5V is produced across it. Calculate the internal resistance if the battery.Homework Equations I=V/R?The Attempt at a Solution It's on paper - sorry!Answer = 1.67 -...

Homework Statement Provided that the input resistance of the DMM is much larger than the resistance values in the circuit to which it is connected, the DMM will not draw a significant current. Estimate the input resistance of the DMM by connecting the 10 M resistor supplied in series with...

I am kind of confused by the conflict of the following two concepts. If I understood correctly, internal energy of a system is independent of the volume occupied by the gas molecules. This is because the gas molecules are assumed to be ideal and therefore have no intermolecular interactions...

Homework Statement A battery having an emf of 9.30 V delivers 103 mA when connected to a 60.0 ohms load. Determine the internal resistance of the battery. Homework Equations V = E - IR The Attempt at a Solution i plugged in 9.3 for V, .103 for I, and 60, for R... and i got...

I remember seeing a commercial advertisement in which a hamster in a cage moved itself towards a desirable item (food or something) that its owner had on the counter by throwing itself against the side of its own cage. Would this really be possible? On the one hand it seems like there are only...

Hi All, I would like to know what is the precise meaning of the internal resistance of a DC source of voltage. Does it have some chemical contribution (as for instance, mean time for the reaction to occur, mean velocity of difusion of charge through the acid solution, or something like...

How can I go about calculating internal resistance? I have variables I, R, and V but no idea on how to find the 'internal' resistance. Is this some sort of special case?

Homework Statement Devise a NON DESTRUCTIVE scheme to measure the resistance of the 0-1mA meter that is provided in the lab. You may make use of an external power supply (or battery) and other circuit components such as resistors to make your measurement. Design your measurement scheme so that...

Homework Statement Calculate internal resistance of meter. There is a 10V power supply with a variable resistor connected in series. The meter will be connected across the resistor. I adjust the resistor until the reading in the meter read about 5.37V. The value of resistance is 15 ohms. How...

In Diamonds, light that enters gets trapped within due to total internal reflection, defined as: Total internal reflection is an optical phenomenon that occurs when a ray of light strikes a medium boundary at an angle larger than the critical angle with respect to the normal to the surface...

[Solved] Total internal reflection, underwater light? Homework Statement A point source of light is at the bottom of a koi pond, at a depth of 0.525 meters. What is the radius of the circle of light formed on the water's surface? Take the index of refraction of water to be 1.33. Hint: Some of...

Does a persons attitude, or way of life affect their internal body? I don't mean it as a couch potato will be weak. I mean it as a picky person will they have allergies? Will a germ phobic have ...

Homework Statement In the figure shown below, a light ray enters a glass slab (with index of refraction nglass = 1.65 ) at point A and then undergoes total internal reflection at point B. The medium that surrounds the glass slab is a liquid whose index of refraction, nliquid =...

Hello I'm exploring the possibility of filtering the induction air of an internal combustion engine through a suitable zeolite to increase its oxygen percentage. I've read the thread on Pressure Swing Adsorbtion and understand that normally air is forced through the zeolite at up to 150kPa...

Homework Statement -Behind a glass container with water, there is a candle. The container is paralelopiped - shaped. What is the image that the viewer is going to see, if the eye is set like so, that he watches the candle with an angle greater than the angle of total reflection? -Hold a...

Homework Statement a battery with unknown internal resistance and open circuit potential (emf) is connected toa 3 ohm external resistor. the terminal potential is found to be 60 volts. when the same battery is connected to a 48 ohm resistor, the terminal potential is 96 volts. what is the...

http://img210.imageshack.us/img210/6094/questionuz8.png i) What is the angle of refraction of the ray RS after it strikes the glass prism of refractive index=1.5? ii) If the critical angle is 41.8 degrees, deduce whether the ray will suffer total internal reflection. 2. Homework Equations ...

This is a rather interesting development and it will be interesting to see where it goes. I guess this is good news? Al-Qaida at War with Itself, Author Says http://www.npr.org/templates/story/story.php?storyId=90805085 Seems like there is an opportunity to reduce terrorism if groups like...

[SOLVED] Internal energy of a gas Is the internal energy of a gas simply the total kinetic energy possesed by the particles? I ask this, since I have read this to be the case, however I have also read that when changing state, eg. from liquid to gas, the latent heat is the energy required to...

The battery of an electric car consists of 30 cells, connected in series, to supply current to the motor. (a) Assume that the internal resistance of each cell is negligible and that the pd across each cell is 6.0V. (i) State the pd across the motor. (ii) The battery provides 7.2kW to the...

[SOLVED] Internal Energy of an ideal gas Homework Statement The temperature of 0.158 mol of an ideal gas is held constant at 67.0 degrees Celsius while its volume is reduced to a fraction of 20.0 % of its initial volume. The initial pressure of the gas is 1.19 atm. What is the change in...

[SOLVED] Linear Momentum - One-Dimensional Internal Explosion 1. A body is traveling at 2.0m/s along the positive direction of an x axis; no net force acts on the body. An internal explosion separates the body into two parts, each of 4.0 kg, and increases the total kinetic energy by 16 J. The...

Any one has any ideas where can i find an expression for the internal potential that results in an isolated silicon sample... i know why this internal electric field is set up due to the space charge region... having the diffusion process that tends to generate more space change and the...

I have written in my notes the following: "Total internal reflection will have reflecting ray only, same as incident (60 degrees)." I understand everything but the 60 degrees part. If there is total internal reflection, will the angle of reflection and the angle of incident both always be...

[SOLVED] Internal Reflection Problem Homework Statement (please check attachment for figure) ni = 1 nr = 1.48 theta_I = 50 degrees l = 3.1 mm w = 42 cm Find N (Number of reflections before laser beam finally emerges). Homework Equations Snell's Law: ni sin theta_I = nr sin theta_r The...

Homework Statement When a current of 2A flows the p.d across a battery's terminal falls from 12V to 9V. (a) What is the value of the loss volt? (b) What is the internal resistance of the battery? Homework Equations Lost Volt = Ir The Attempt at a Solution (a) 12V - 9V = 3V R =...

[SOLVED] Battery with internal resistor Homework Statement What is the current in a 8.25 ohm resistor connected to a battery that has a .21 ohm internal resistance when the potential drop across the terminals of the battery is 6V?Homework Equations R_{s}=R_{1}+R_{2}... V=IR The Attempt at a...

Homework Statement On his honeymoon, James Joule tested the conversion of mechanical energy into internal energy by measuring temperatures of falling water. If water at the top of a Swiss waterfall has a temperature of 10.0 degrees Celsius and then falls 50.0 m, what maximum temperature at the...

Homework Statement P=RT/(v-b) - a/(T(V+c)^2) Homework Equations u2-u1= Integral ( Cv dT) + Integral ( T * (dP/dT)v - P) dV The Attempt at a Solution I've differentiated P with respect to T to get R/(v-b)+a/(T^2(V+C)^2 and plugged the relevants back into the equation for...

Why do automobile batteries have very low internal resistance?

Internal Engery PROBLEM, HELP NEEDED! Homework Statement A 0.75 kg spike is hammered into a railroad tie. The initial speed of the spike is equal to 3 m/s. a) If the tie and spike together absorb 85 percent of the spikes initial kinetic energy as internal energy, calculate the increase in...

Homework Statement Basically, my task is to find out the internal resistance of a solar cell. I set-up a circuit as seen here (http : / / mt14 . quickshareit . com / share / picture666d18 . png), and measured the Current and Voltage on different settings of resistance in 5Ohm intervals from...

I know that molecules have kinetic and potential energy to make up internal energy. When the temperature of an object increases, the internal energy increases. When the kinetic energy doubles, the temperature doubles as KE is directly proportional to the kelvin temperature. Does this mean...

Why is it that T.I.R. only occurs when a light is traveling from a denser to a rarer medium? Intuition suggests that this should happen when going from a rarer to a denser medium. Care to get into some mathematics? Also, can the interface between 2 media be designed so that there is 100%...

Homework Statement I have liquid natural gas, or LNG, at -165degrees Celsius. I want to know the total energy required to heat the gas up 50ml to 5 degrees Celsius. Homework Equations Not sure. Im assuming I need information regarding specific heat etc. Heat of vaporization maybe...

Homework Statement A rule of thumb used to determine the internal resistance of a source is that it is the open-circuit voltage divided by the short-circuit current. Is this correct? Why or why not? thx for any help

Moon "rotation" The experiment below is to demonstrate that the moon does not rotate on its "internal" axis as it orbits earth. Hold an orange (the moon) with an X marked on it straight out from you in the palm of your hand with the X pointing toward you. Then, while standing in the same...