Problem with Avogrado's Las
My understanding of Avogrado's law is this: say I have a movable piston at a certain volume. When I pump air in, the pressure increases as the frequency of collision increases so the force acting on...
View ArticleHow will objects roll in the absence of friction?
I am just wondering (out of curiosity) these past few days what would happen if an object rolls on a frictionless surface. I was thinking if a spherical object is on a free space and is subjected to...
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Wing pitching moment ( torque not around cg ) - head hurts!!
Hi all! :) First post! I am currently coding up a basic flight simulator for fun. It is all going well so far - and certainly improving my rusty physics knowledge. I break the wing down into elements...
View ArticleWhy does the moon appear larger at the horizon?
I've heard two hypothesis: 1. The air causes the image of the moon to literally appear larger2. The increased size of the moon comes purely from illusion of perspective Which one is it?
View ArticleFourier Optics
I have been studying Fourier Optics and I have a basic conceptual question. I understand the mathematics of how to perform Fourier Transforms however the part of this topic I seem to have missed is why...
View ArticleSharks can sense the electric field perturbation?
Sharks use an organ known has the ampullae of Lorenzini to sense electric fields, they can sense fields as weak as 5*10^-9 V/m. Which got me thinking, they should in principle be able to detect vacuum...
View ArticleWhy the heat of vaporization decreases with increasing temperature ?
Heat of vaporization of water slightly decreases with temperature. https://en.wikipedia.org/wiki/Enthalpy_of_vaporization Does anybody know of a simple explanation of this fact based on molecular...
View ArticleWhat is the effect of multiple forces on a 2D rigid rectangle?
Say I have a rectangle of width w and height h centred at (0, 0) on a 2D coordinate plane. The rectangle is free to move on a frictionless medium. It is not attached at any point. Case 1: A single...
View ArticleMirrors reflecting images infinitely
Hi Everyone, This is a physics problem but also an everyday home one I'm trying to resolve. In our bathroom, we have two mirrors on opposite walls (parallel walls)... because of this, they reflect...
View ArticleCalculating max velocity of car
Hey! I have a project where I'm building a car running from direct sun-light only using solar-panels and bike hub motors. I would like to determine max velocity before cashing out on motors and panels....
View Articledetermining the direction of an induced electric field
Assuming there is a time varying magnetic field (B) , how to determine the direction of the induced electric field due to B. and to which parameters does it depend?
View ArticleRaoult's Law and volume changes
When I have a pure liquid in an enclosed container, there is a fixed vapour pressure at a specific temperature. So if i were to increase the volume of the container, more liquid would turn into a...
View ArticleFinding the moment of inertia of a 2D polygon.
Hi everyone, Is there a general method for finding out the moment of inertia of an irregular convex 2D polygon given the coordinates of its vertices? I have thought of one possible method: Split the...
View ArticleWhat coild and capacitor to use in LC-circuit
I am building an LC-circuit. I was wondering what power of capacitor and loops of coil would be best to use to create a change in flux, which was not to big but could be detected in a range of 2 meters...
View ArticleQuantum interference with different polarization
Hi all, Imagine a double slit experiment where each slit contains a polarization filter with some angle relative to each other ([itex]\alpha[/itex]). If the polarization filters are parallel the usual...
View ArticleCurrent, Voltage and Batteries
I have a bit of confusion over how a bulb lights up in a simple DC circuit. My book says it's because the electrons within the filament start moving as soon as a battery is connected. My book also says...
View ArticleWork-Kinetic Energy Theorem Applicability
Hello there. I've yet to take a theoretical mechanics course (next Spring) but I've been reviewing my intro level class and I've run into some confusion regarding the work-kinetic energy theorem. My...
View Articleammonia forced to boil because H2 is at 200psi ?
Comes now the web page http://www.dr-fix-it.com/absorption.html which says that the ammonia-based absorption-cycle refrigerators ==do== operate only because droplets of liquid ammonia dripping into the...
View ArticleWhy does shuttling ball travel faster if plates are closer together?
Shuttling ball. I was told that as the two conductive plates are brought closer together the speed the shuttling ball travels between them is increased. I don't understand this as i thought because the...
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Formula/calculation of the magnetic field & inductance in a AC cable
Hello dear PF-members! :shy: I'm looking for some appropriate formula which could be utilized to calculate the magnetic field density in a straight high voltage AC mere cable. If you're more into the...
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