Colors from soap bubble films
on a soap bubble colours can be seen.my text book says its due to the interference betwewn light waves from the top and the bottom surfaces of thin films.but how?so confused:confused: i tried googling...
View Articlecalibrate a balance scale
I have a classroom full of Ohaus cent-o-gram model 311. Most work fine, but a few I can't calibrate to 0. I've used the calibration screw, but even maxed out it isn't enough. I could always place a...
View ArticleDrag Equation
For several years i have thought about air (fluid) resistance without getting deeper into the formulas that model its behaviour. Recently, i've decided to take one more step in the subject and learn...
View ArticleWhat exactly is Phase space
What exactly is phase space and how is it different from real space i.e. 3 co-ordinate system? what does it mean when someone says "dynamics occurs in phase space"? I'm very new to all this so pls take...
View ArticleOblique Coordinate systems
In a coordinate system two axes are inclined at an acute angle θ. Is this coordinate system different from a coordinate system in which the axes are inclined at an angle (180 - θ)? if we look at the...
View ArticleDirectivity of a laser beam
I realise that there are two factors that must affect the directivity of a laser. 1, The length of the cavity and number of reflections and 2. The aperture of the exit or the subsequent optics. This...
View ArticleEqual and opposite torques?
Angular momentum is conserved, which means that the change in angular momentum of object A must be exactly canceled by the change in angular momentum of the object exerting a torque on object A. So,...
View ArticleCan any object with positive mechanical energy collide earth?
Object with positive mechanical energy in an attractive force field moves along a hyperbolic path and whose energy is zero, moves along parabolic path...isn't it?...But why?...Can't any object with ve...
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Electrostatic Boundary Conditions
In Griffith's section about electrostatic boundary conditions, he says that given a surface with charge density [itex] \sigma [/itex], and take a wafer-thin Gaussian pillbox extending over the top and...
View ArticleTechnical Rescue Physics Question
Hi all! I am hoping your combined brains can help me with a problem in analyzing a technical rope rescue system I have been using for a few years. Here is the scenario: There is a patient on one end of...
View ArticleIce should sink?
Please help. Ice is more denser than water when temperature of water ≥9°C. Then why ice doesn't sink in water at these temperatures? I greatly appreciate your help. Density chart:...
View ArticleAny good ordinary classical mechanics books?
I am studying for the mechanics modules of A level mathematics under EdExcel.So far the books seemingly published to support the specifications aren't doing a very good job.The examples in the books...
View ArticleIs the angular acceleration of a rolling object constant?
I understand that the torque caused by the friction must cause an angular acceleration, and it makes sense that the angular velocity increases from the bottom to the top so if there was a particle on...
View Articlenonconservative work
This isn't homework. I'm reviewing physics after many years of neglect. As with most of my posts, I made this problem up. Let object A have mass [itex]m_A[/itex] and object B have mass...
View Articley of water at 1000 C
Hello, I am trying to find the heat capacity ratio of water at 1000C or 1273.15K. I have tried to find it through various website but have yet to find anything past 375C. I could find the gamma if I...
View ArticleMeasurement of time
According to "Physics for Engineers and Scientists by Ohanian and Markert, a second is the time needed for 9,192,631,770 vibrations of a cesium atom. In 1971, Hafele and Keating put four cesium-beam...
View ArticleLagrangian Mechanics - Non Commutativity rule
Hi there, I am reading about Lagrangian mechanics. At some point the difference between the temporal derivative of a variation and variation of the temporal derivative is discussed. The fact that the...
View ArticleAbout locality in classical physics
In wikipedia it says that "Coulomb's law of electric forces was initially also formulated as instantaneous action at a distance, but was later superseded by Maxwell's Equations of electromagnetism...
View ArticleHalls solution for Mercury's precession
Hall showed that a slight increase in the radius exponent in Newton's equation would cause precession. What would the result be if the exponent was slightly less than 2.
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Charge within a cavity inside a conducting material
Suppose I have a charge inside a conductor as shown in the image I've attached. For any charge distribution: [tex] \oint \mathbf{E} \cdot d \mathbf{a} = 0 [/tex] I can see that if I took some path from...
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