Buoyant force and volume submerged
Hello, This is bugging me so I'd appreciate any help. I have two objects made from the same material with the same mass. The base of Object 2 is 3 times that of Object 1. If I place the objects base...
View ArticleSpring Pendulum
I did read some of the posts on the topic. However, I just want to check my qualitative understanding without employing too much mathematical dynamics. If anyone has some feedback, this would be much...
View ArticleThought experiment about fluid compressibility
I'm a physics noob but this is something I was thinking about when I read in my textbook that fluids are generally incompressible. Let's say I had 1000 L of water enclosed in a sphere several meters...
View ArticleSymplectic Structure of Thermodynamics and the Hamiltonian
(inspired partially by this blog post: http://johncarlosbaez.wordpress.com/...namics-part-1/ To my understanding, the thermodynamic configuration space has a nice symplectic structure. For example,...
View ArticleQueston for laws of motion
A tangential force is appliied on pully hinged at its centre of gravity. will there be any reaction force at its center?? if yes then how much??? will it be same as applies force? practically it seems...
View ArticleBig Town Clock or Tower clock
I just wanted to know how a town or a tower clock works. I would like to know if I can device a mechanism such that I will be able to use the striking train to strike every second, loud and clear i.e....
View ArticleGold's index of refraction in micro-onde
Are there someones know about gold's index of refraction in micro-onde, for exemple in frequency 10GHz? Or a book in which I may find the value. Thanks a lot.
View ArticleQuestion about work
Hello, i have one question about work, Does work must be mechanical ? or we can change of some energy that is not mechanical (like internal or chemical) call work ?
View ArticleMass of a point on an object ?
hi all. i'm currently researching angular/rotational dynamics for a hobby project i'm working on (2d physics engine). A curious thought has popped up in my mind. How does a hammer work? What i mean...
View ArticleCurrent phase between inductor and capacitor in LCR-circuit
At resonance (## \omega_0^2= 1/LC##) in an LCR-Circuit the phase angle given by [tex]\theta=\tan^{-1}\left( \frac{\omega L - 1/\omega C}{R} \right)[/tex] obviously is zero. And still there are other...
View ArticleGalilean invariance and kinetic energy
I tried to look this up on the internet. I know there is a book about it but I forgot its title. I know that you can prove that the kinetic energy should be proportional to velocity squared by saying...
View Articlepolarizing EM radiation, how does it work?
for RF, how does this mechanism work? http://i.imgur.com/Crx4Amx.png how does the conductor do this? and why does the unpolarized RF not seep through the spaces between the conductive bars?
View ArticleGravitational Constant (Big G I think)
G = (6.674215 ± 0.000092) x 10-11 m3/kg/s2 or there abouts is the constant that we multiply to the mass of m1 to m2 divided by the distance squared. This gives us the attractive force between bodies....
View ArticleAngular momentum
I just want to test my understanding of angular momentum here... I rotate a sphere in space such that the axis of rotation passes through it's diameter, by applying a torque. At one moment of time, I...
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Motion of particle dropped onto an elastic band
Hi All, This is part solution, part request for peer review. I wasn't able to find a model for the motion of a particle dropped onto an elastic band so I've created my own in Excel (attached). Note...
View ArticleGibbs free energy and the first law of thermodynamics
Hi thanks for reading. I have 2 questions regarding the topics mentioned that I'm having trouble with. Hope you guys can help me out here :) 1) The first law is ΔU=Q+W so we can rearrange this to get...
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Calculate forces and speed on a zipline
Hi, First of all, this is not my expertise so I'm sorry for things that are noted wrong. I would like to know some things about a zipline I'm going to build. Velocity of a person after 60 and 74 meters...
View ArticleIsing-Heisenberg model
Hamiltonian ##H=-J\sum_{\vec{n},\vec{m}}(S_{\vec{n}}^xS_{\vec{m}}^x+S_{\vec{n}}^yS_{\vec {m}}^y+aS_{\vec{n}}^zS_{\vec{m}}^z) ## If ##a>2## is that behaves like Ising model? For example in ##2d##...
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Variance in particle number
I saw an equation on wikipedia: (http://en.wikipedia.org/wiki/Fermi-Dirac_statistics) Does anybody know how this is derived?
View ArticleRolling resistance of solid tires versus pneumatic
Hi everyone - quick question on something that's been bugging me. So, train wheels, which are solid steel, have incredibly low rolling resistance, an order of magnitude less than average car tires....
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