Internal Definition and 957 Threads

[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...

[FONT="Georgia"][SIZE="3"]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...

[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?

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...

I am going over this example 0.5 kg of air undergoes a Carnot cycle with η = 0.5. Given the initial pressure p1 = 700 kPa, initial volume V1 = 0.12 m3 and heat transfer during the isothermal expansion process Q12 = 40 kJ, Find the highest and the lowest temperatures in the...

[SOLVED] Internal Energy and Heat Homework Statement Ten joules of heat energy are transferred to a sample of an ideal gas at constant temperature. As a result, the internal energy of the gas: a) increases by 10 J b) increases by less than 10 J c) increases by more than 10 J d) remains...

This is an attempt to calculate the efficiency of a modern gasoline engine (Volkswagen's 1.6 litre FSI). The result seems too good to be true. Please let me know if there is any error. At a constant 100 km/h on a flat motorway, the consumption of my car reads 5.7 l/100 km. The engine revs...

Like in the other problem I posted- This is the other question that I missed and just can't find a solution for. Homework Statement Prove the internal pressure is 0 for an ideal gas and ((n^2)a)/(v^2) for a Van der Waals gas. Homework Equations 1. VdQ Eqn: p= (nRT)/(v-b) -...

Homework Statement "A 6.0V battery is connected across a parallel combination of two resistors ; one 10 ohm and one 40 ohm. Thee total current provided by the battery is 0.25A. Obtain a value for the internal resistance. Homework Equations E= IR +Ir The Attempt at a Solution...

Question on total reflection...if you were to conceal a coin, by putting it under a beaker whose lid is covered with foil, and you slowly add a liquid until the coin seemingly disappears, which would require a greater volume? oil or water?

An internal combustion engine runs on octane, the enthalpy of combustion is -5512 kJ/mol. The mass of 1 gallon of fuel is 3 kg. The engine temperature is 2000 degrees C and the exit temperature is 800 degrees C. What is the work done? The total enthalpy is -145053 kJ. The total number of...

I am having trouble explaining the difference between internal and external forces, and in fact, even *defining* internal forces. Does anyone understand the difference very well? My current example is: Hold an elastic band loosely between both your index fingers. Now, move your fingers...

[SOLVED] Internal energy, thermodynamics Homework Statement I have the equation for the internal energy: U = (f/2) * N * k * T, where f is the degrees of freedom, N is the number of molecules, k is Bolzmann's constant and T is the temperature in Kelvin. This can be written as U = (f/2)*p*V...

Relevant equations int rest =emf - terminal potential / current or r=E-V/I The attempt at a solution Since Emf of a cell is inversely proportional to temp (From Nernst Equation of Emf of a cell), from the above equation, if temp is high, E is low, therefore r is low. So, acc. to me...

Anyone with any idea about the basic internal design & engines in an electric car?

Hey everyone, I'm knocking my head against something and for some reason I can't get it to work out -- I'm running an N-body simulation which uses an internal gravitational constant of 1, meaning that the timestep used is a function of the units of mass, length, and velocity. But I don't know...

[SOLVED] Internal Energy Problem Homework Statement Given .15meters cubed of Helium gas at 300K and 3Pa in a chamber with a frictionless piston. How much heat is required to double the internal energy of the gas at constant pressure? Homework Equations I really don't know what equations...

Hi There, Right I recently did an experiment in Physics to find out the internal resistance of a lemon when used as a power supply. We connected the lemon to a voltmeter, ammeter and variable resistor, changed the resistance on the variable resistance and measured the voltage and current...

Internal struggles of ideas in non-string QG One should not exaggerate the internal struggles which are going on or ready to happen. But we might take note of some of the internal conflicts. Issues that will probably get worked out in the next few months----whether or not they are openly...

[b]1. A white light source is below the lower surface of a piece of optical-quality glass. The glass has an index of refraction of 1.520 for red light and 1.538 for violet. If you were able to move your eye at any angle relative to the perpendicular to the glass, calculate A) Which color...

I hope someone can help me with my coursework by making sure my method is ok and is actually correct for my experiment. Note. I will not actually be doing this it is just a plan of what I could do! 1. I am provided with a cell of approcimate EMF 1.5V, an approximate internal resistance of 1Ω...

Homework Statement this is a picture of an example from the book. I am going off of it to solve a problem that will be on my test tomorrow. i can figure out how to calculate the shear force and moment of each section (though i don't fully understand it), but I am just not getting how they...

1. Find the current in, and the potential difference across, each resistor in the circuit shown below: The circuit is a simple parallel circuit with 2.0 ohms at the first resistor, 10.0 ohms at the second, and 20.0 ohms at the third The problem also gives you Emf which is 12.0 V and the...

One mole of an ideal diatomic gas at room temperature undergoes a transition from a to c along the diagonal path in Figure 19-23. (a) During the transition, what is the change in internal energy of the gas? -4987 J (b) How much energy is added to the gas as heat? ____ J (c) How much heat is...

in the problem they give you V=44m/s, mass=.09 kg , and a vertical distance=18m the problem states that a ball is shot straight down and at the distance 18m it encounters a sand bag the ball goes through the sand bag .5 m. they ask what is the internal work neglecting friction? for this...

Homework Statement Hi, my first post here. :smile: Anyway I am struggling with this homework, can someone help me out, show me what to do please. 1)a cell can supply a current of 1.2A through two 2ohm resistors connected in parallel. When they are connected in series the value of the...

Can anybody please give me an example of INTERNAL and EXTERNAL force. I was told by my Professor that there is only internal Torque at the moment when you are running toward a marygoround and grab so of the handles. PLEASE EXPLAIN ME WHY.

For this question: http://tinyurl.com/3ahesh the answer is a. May I know how do we come to the conclusion that the net change of internal energy of the gas is zero?

Internal energy vs temperature(q37) For this question: http://tinyurl.com/3ymlnj The answer to this question is c. But according to my understanding, increasing of internal energy means increasing of temperature. Hence is isothermal situation, the change of internal energy is 0. With...

Homework Statement The potential difference across the terminals of a battery is 8.20 V when there is a current of 1.54 A in the battery from the negative to the positive terminal. When the current is 3.56 A in the reverse direction, the potential difference becomes 9.40 V. What is the...

Homework Statement This problem relates to an experiment to determine the e.m.f and internal resistance of a battery using a variable load. Taking values for V & I a graphy of V vs. I was plotted. Homework Equations E=IR+Ir V=IR The Attempt at a Solution After plotting the graph...

Regarding "Total Internal Reflection" Hi, and thanks in advance for viewing this post. I'd like to type out the question first; Q: Consider the optical interface between crown glass and ethanol. a) Under what conditions would total internal reflection be possible at this interface? Illustrate...

How can I design an internal combustion engine especially with connecting rod?

Homework Statement One mole of hydrogen gas is heated from 278 K to 390 K at constant pressure. Hydrogen has a specific heat of 43.6 J/mol*K. The universal gas constant is 8.31451 J/K mol. Calculate the change in the internal energy of the gas. Answer in units of J Homework Equations...

Homework Statement one mole of He, H2, CO2 goes through a process such that the change in their internal energies are the same. WHich of the gases has a higher temp change? Homework Equations Eint=3/2nRdeltaT=nCvdeltaT (for monatomic gases) Eint=5/2nRT (diatomic gases) polytamoic gases...

light refractions problem I don't even know where to start with this problem. Can someone please help me out? As shown in Figure P22.49, a light ray is incident normal to on one face of a 30°-60°-90° block of zircon(n= 1.923) that is immersed in water. Figure P22.49 (a) Determine the...

Homework Statement The refractive index of the Earth's atmosphere is: n=1.01+(alpha)(R-r) where (alpha) is a constant, r is radial distance from Earth's centre and R is the Earth's radius. By considering a path comprising a series of total internal reflections or otherwise, find a value of...

I am currently in my first year in Mechatronics Major, and now I am trying to understanding about statics of beam. How about draw the shear and moment curve? How about if the force is variation and have graph too. Just like this for example || V the curve of this like sinus or cosinus...