Internal Definition and 993 Threads

I was thinking , if we take into account oly the internal motion of atoms , all collisions will turn out to be elastic. Wont they be?

I have divined the reason of the American internal war. The American internal war will start at Chinese lunar calendar date August, it converts to Western date is in September and October, it is just now. But the cause I can't reveal it, otherwise I will get punishment from the God. Chinese...

help me with this please... i just couldn't get it. 1) a complete circuit consists of a 12.0 V battery with a 4.50 ohm resistor and switch. the internal resistance of the battery is 0.30 ohms when switch is open. what does the voltmeter read when placed: a. across the terminal of the...

In moving out of a dormitory at the end of the semester, a student does 2.69 x 104 J of work. In the process, his internal energy decreases by 5.52 x 104 J. Determine each of the following quantities (including the algebraic sign): (a)W, (b) delta U, and (c)Q. I get the following using...

Can someone explain the phenomenon of total internal reflection?

Our Morning Prayer :biggrin: Our Hard Drive Which art internal Volume C by name; Thy code be clean, Thy fonts be seen On screen as they are on paper. Give us this day our documents, And lead us not into fragmentation But deliver us our data. For thine is the SCSI, And the EISA...

This Q has me stumped, I'm still flicking through some web pages and my textbook, but been unable to find a useful formula to work it out yet: :confused:

A battery of e.m.f. 4.5V is connected across a 12 ohm resistor, if the Pd. Across the resistor is 3V calculate a)the current in the circuit ? b)internal resistance of the battery? iv tried my best but i can't do it

Hey, I'm revising for my summer exams, and gotten stuck on this particluar question. _______ 6V ______2.0 ohms___ I I A I I I I I_____4.0...

heres another conceptual one . there is a standard yet very elegant problem about a rocket bllowing up mid air and finding the final postions of the parts of the projectile using the principle of centre of mass remaining the same since the forces a re internal when the rocket blows up . now...

i have attached a doc file. it shows two coaxial circular bars of different material and a force(30kn) is applied in the top. I think the internal forces in both the bars will be 30kn. Am i correct. bar1 is made of steel and bar 2 of aluminium. the total length of the structure is 10metres.

i have a circular tube of diameter 20mm,thickness 1mm and length 500 metres i bend the tube into a radius of 50mm. obviously the tube has entered the plastic stage. But what would have happened to the material properties. hOW CAN I CALCULATE THE CHANGE IN MATERIAL PROPERTIES. THE...

Hello. I use a kind of motion sensor located in a sealed metal enclosure. I perform temperature offset calibrating to this device, using an external temperature sensor (attached to the enclosure). This solves the most of temperature problems except when the temperature gradient is large -...

What causes internal resistance in the following: A) A Cell, B) A Solar Cell? Is it not just the same thing? Thanks in advance. :smile:

My chem book says that Enthalpy = internal energy+pressure*volume However it says that enthalpy for a particular state cannot be calculated. Only the enthalpy change can be calculated. This has me confused. Aren't internal energy, pressure and volume calculabe for a particular state...

I'm doing an experiment to measure the internal resistance of a zinc carbon cell (battery) and have slightly confused myself! Do I use the ε= IR + Ir formula? And if so how in the world do I use it! I know that I can work out R by using V and I values but how do I find the EMF of the battery...

A corner reflector is to be made from a triangular prism with index of refraction n=2.56, as shown in the diagram on your assignment. What is the maximum angle (in °), with respect to the normal to the front surface of the prism, (theta), such that total reflection will occur? Ok this must be...

The answer to the attachment is if the R resistance was equal to the internal resistance. How was this determined? Please explain this to me because i have no idea how they can solve this. Thanks

I do not know what to solve for...? One recargable battery of mass 15g delivers to a cd player an average current of 1.80mA at 1.60 V for 2.4hours before the battery needs to be recharged. The recharger maintains a potential difference of 2.30v across the battery and delivers a charging...

Why will total internal reflection occur when angle of incidence is greater than the critical angle? Anything deal with the particles?

I am currently doing a lab trying to calculate internal resitance of a battery. Do I use the formula V=IR?

Hi, I am trying to model the temperature profile of the inside of a tent, with a view to introducing a fan which can suck outside air, to inside the tent, to cool it down on a hot sunny summer morning. I thought I would start by just trying to model the interior of a tent in these...

>> An ideal gas is compressed to one-fourth of its original volume while its temperature is held constant. (Hint: solve part (b) first.) (a) If 950 J of energy is removed from the gas during the compression, how much work is done on the gas? (b) What is the change in the internal energy of the...

Hello everyone, I have created a program that plots the orbit of a comet around our sun, as it orbits, a ratio between internal binding forces and tidal forces is calculated (this produces a Roche limit). I am using this equation to obtain the internal bonding force: F = (G * M * Mu) / (r ^ 2)...

internal structure <-->property?! can anyone suggest some link relating the internal structure of steel (like crystal arrangement such kind of thing) to their property like malleability, hardness etc. it's hard to get information from search engine. (it'd be better if it talks about the...

Ok so now our class is onto snell's law... We did a few experiments where light refracts when it is passing into a new medium... In an experiment today we were trying to find the total internal refraction, and my friend shined the light at an angle and we observed a spectrum... ? but it...

Hey I am confused as to the answer to this question; not sure exactly how to figure out what the answer is because it is not a constant resistance. Any help appreciated: The potential difference across the terminals of a battery is V_1 when there is a current of I_1 in the battery from the...

I have a question concerning internal energy and the First Law of Thermodynamics. If you plotted P vs V and the shape of the graph is an enclosed shape ie) square or triangle, would the total internal energy in one cycle be zero? (one cycle is for example-start at top left of square and finish...

Please Help! Internal Forces in Statics I have been attempting to answer the problems on my Statics assignment for about a week now but I have not been so success full. I have only be able to answer on of the problems the other three below I get stuck on. Can someone please help me get past...

QUESTION: The boom DF of the jib crane and the column DE have a uniform weight of 50 lb/ft. If the hoist and load weight 300 lb, determine the resultant internal loadings in the crane on cross sections through points A, B, and C. (Diagram and answers are attached) I'm just hoping someone...

Hi, I'm new here... I already read about how the signals are transmited through the fibre optical cables... total internal reflection But what I don't understand is the another day I was scribbling it on a piece of paper (the total internal reflection that is)... I noticed that from the way...

The Question: A 45-45-90 prism is immersed in water. What is the minimum index or fefraction the prism must have if it is to reflect totaly a ray incident normally on one of its faces. Now, we have found this question a bit hard to understand. We assume that light is hitting one of the...

I was just curious as to what mechanism in our body tells time. How is it that we can count 1,2,3,4,5,6,ect to a moderate accuracy? I would guess it gaugues something harmonic, but what do I know. Any help would be Grrrreat!

I know that by definition a conservative force is a force that is independent of the path. An internal force is a force within a system. Now, the mechanical energy is conserved only when conservative forces are acting on a particular system. On the other hand some people say that it is...

ok, i need help with this one question. the diagram that goes with this question is at the following website: http://courseweb.edteched.uottawa.ca/phy1102A/Assignments/Problems/PHY1102A-Assignment%204_files/image005.jpg i tried attaching it but it was too big. ok so here it is: A ray of...

I've got a set of questions based on internal energy and specific heat capacities and things. I could just do with a bit of help on some of them. Just a push in the right direction will probably do! Thanks. Specific heat capacity of water = 4200 J/kg/K Specific heat capacity of ice = 2100...

Hello, I am trying to write the transfer matrix for surface with an s-polarized em wave incident on it. I want to look at the case of total internal reflection- but I don't know if it makes any sense to look at the transfer matrix in that case, since there is no transfer across the boundary...

Determine the change in internal energy of 1 kg of water at 100 degrees C when it is fully boiled. Once boiled this volume of water changes to 1671 Liters of steam at 100 degrees C Assume the pressure remains constantat 1 atm things i know 1 L =1E-3 m3 1atm = 1.013E5 N/m2 1 L = 1000 cm3 =...

Seem to have ran into a brick wall with this problem Determine the change in internal energy of 1 kg of water at 100 degrees C when it is fully boiled. Once boiled this volume of water changes to 1671 Liters of steam at 100 degrees C Assume the pressure remains constantat 1 atm things i know...

When does each OCCUR? -Please,Simplify your answers as far as possible but be scientific-

If anyone could provide some insight into how I might go about solving this problem it would be greatly appreciated. Q: A ray enters the flat end of a long rectanglular block of glass that has refractive index n_2 as shown in the following figure. Show that all the entering rays can be...

The drawing shows an optical fiber that consists of a core made of flint glass (nflint = 1.667) surrounded by a cladding made of crown glass (ncrown = 1.523). A beam of light enters the fiber from air at an angle q 1 with respect to the normal. What is q 1 if the light strikes the core-cladding...

"glass" is a solid material with an amorphous internal structure. http://science.nasa.gov/headlines/y2003/14apr_zeroglass.htm So does it imply that if I have 1kg egg shell, and I heat it to 2000 F and cool it immediately before the atoms arrange themselves regularly again, then I can...