Steady State Heat Transfer - Contribution to Reaching Equilibrium
Hi, I'm interested in the theory of an Aluminum sphere that is initially at some temperature that is hotter than its surroundings. The sphere is surrounded by air at some small radius, say one meter,...
View ArticleHall effect and semiconductors
I had a problem understanding the hall effect for flow of holes... I thought flowing of holes means that the electrons are flowing the opposite direction,leaving open holes and that's it... but when...
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Aerocapture: Aerodynamics, Aerodynamic Heating and High-Altitude Atmospheric...
I apologize for the many topics covered at once here, but, this is why: I'm trying to design a vehicle to make aerocaptures from Earth to Mars, and from Mars to Earth (I do these kinds of things quiet...
View ArticleI need a challenging physics project to work on
Hello! I want to have a project to work on. Not a simple project (hands-on) that'll take a few weeks, but an in-depth project that could take me several years. This is not necessary, but I need...
View ArticleHeat transfer from a fluid linear?
If I had water at 180 degrees and dropped the temperature to 160 degrees over a heat exchanger, would I have the same BTU output as if I had water at 100 degrees and dropped the temp to 80 degrees?...
View ArticleHow to graph the compressibility factor (Z) verus reduced pressure
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View ArticleInteresting Heating and Cooling topics?
I have to present an investigation on a topic that is related to healing and cooling. In class we're studying kinetic theory, ideal gas laws, heat, temperature, specific capacity, change of state,...
View ArticleCFM Corrections
Hello, I am trying to calculate the amount of exhaust coming out of an exhaust pipe. I know CFM but I need to correct this number for exhaust temp and barometric pressure. Exhaust temp = 441.2 F Stack...
View ArticleF-Stop and Image Resolution
This is a very simple question. Does a larger f-stop lead to an image with a higher resolution? The reason why I think so is that with a larger f-stop (f-stop=f/D), the focal length will be greater,...
View ArticleWhat is "s" for length derived from?
Hello. I would like to ask what word is the letter "s" indicating length derived from? I can't seem to find it anywhere and I don't know if it is purely arbitrary label, or if it's from some actual...
View ArticleE-field inside a conductor
If you place a conductor in an external E-field the charges inside it will move so as to cancel off the field making the field inside the conductor zero. My question is: Is this also true if you place...
View Articleconservation of angular momentum
If the incident radiation is linearly polarized can the scattered radiation be circularly or elliptically polarized? If the scatter is a lossless dielectric the scattered radiation is not elliptically...
View Articledisplacement and arc length problems
1. v=s/t where s represents the displacement 2. s=rθ where s represents the arc length v=rθ /t Why can substitute here? I guess that is not same things. An arc length is not a straight line but...
View Articlehigh pressures and changing states
how does increasing the pressure of a gas cause it to change its state? When we bring an object to high grounds, a liquid (water) has a lower boiling point as it has a low pressure. What about the gas...
View ArticleHelp with expansion of an expression
Hello, I have a problem to understand how the author made the following expansion: 1/sqrt{1+[2(r-r')*d]/(r-r')^2}≈1-{[(r-r')*d]/(r-r')^2+....} where all the letters go for vectors and the symbol '*' is...
View ArticleHow to calculate the stream function from the potential function?
Hello, I am struggling to work out a matlab program for the numerical calculation of the streamfunction directly from the potentialfunction. I have the latter as a solution of a 2D Laplace equation...
View ArticleWhat is the difference among moment, torque and couple?
What is the difference among moment, torque and couple? Moment = Fd Torque = Fd Couple mean two forces have same magnitude but opposite direction. What is the relationship among them?
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Hall effect
Look at the picture... Here current is flowing through a semiconductor... First think about holes... The holes will pile up on the upside... But if you think about electrons then the electrons also...
View ArticlePurpose of insulating furnaces
Hello all, I'm going to ask something that some people may even feel the dumb I want to know why we insulate furnaces and moulds in plastic processing. I know that during steady state heat transfer,...
View ArticleCentripetal Force vs Centrifugal Force
Hi, thank you for reading this topic. This is something that really bothers me...First of all let me say that I know what the terms centripetal and centrifugal stand for. What's the problem then? The...
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