Does circular swinging increase the distance of a throw?
It is like the throws in hammer throw, when an object is swung circularly, the it does contains an rotational energy right? when it is release, how the energy affect the objects? Does the energy change...
View ArticleWork against gravity confusion
Hi I've just started learning work, energy etc and the first question in the book is in the form: An object of mass m is lifted by a tension through a displacement of h. Find the work done on the...
View ArticleMagnetization and polarization.
Hi, Suppose I have an infinite cylinder with radius R, axis along the z axis and constant magnetization M[itex]\hat{z}[/itex]. I wish to find the magnetic field everywhere. (This is NOT a HW question!...
View ArticleUnity hypotenuse model
Unity hypotenuse model. As a worldline Shown in Fig. WL. http://imageshack.us/photo/my-images/832/29j2.jpg/ Pythagorean treatment shown in Fig. P. http://imageshack.us/photo/my-images/827/8ggf.jpg/
View ArticleHow does a motocylist move his center of mass?
Hi all: we all know that a motorcyclist need to tilt his/her center of mass with the motorcycle when he is turning in order to balance the torque exerted on him. When he is tilted, gravity exert a...
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Artificial gravity ship: Floor?
The other day, I was learning about creating "artificial" gravity by building a gigantic circularly shaped ship which would revolve at a frequency such that the centripetal acceleration coincided with...
View ArticleContinuity equation and air flow
Although continuity equation is often part of fluid mechanics, does it have an application in air flow? For example, lets assume we have a frictionless air duct where air is introduced at a constant...
View ArticleMotion of Reference Frames wrt each other
I am currently working on a Python script to simulate motion of reference frames wrt each other, and I need some help with the math. Here is the problem statement- Suppose I have a frame A A frame B...
View ArticleHow does gear system amplify force?
If i have a small spur gear, and i rotate it and transfer the rotation to another gear with bigger pitch diameter. The output gear(bigger gear) will turn slower right? then does this mean the torque...
View ArticleDiract Delta function
I know this probably belongs in one of the math sections, but I did not quite know where to put it, so I put it in here since I am studying Electrodynamics from Griffiths, and in the first chapter he...
View ArticleIs the triple point a kind of critical point? (thermodynamics)
In a problem in Callen's book I was asked to say what was the latent heat of fusion at the triple point for ammonia. I answered "without performing any algebra, 0J". Because I remember a video I saw on...
View ArticleEnergy and conservation of momentum confusion
If you consider a bullet firing from a gun then you have conservation of momentum and a Newton's third law pair (according to what i have read on the internet anyway). They both experience the same...
View Articlebest colour to paint something to keep cool
Hi, could anyone tell me please, what would be the best colour to paint a boat to keep the cabin cool in a tropical climate? I think the answer probably is white because it will absorb less radiation,...
View ArticleCharging a system of metal rods
I am trying to charge a system of two metal rods, of definite length, placed a certain distance apart. But before setting up the rods and hooking them to any battery, i wish to know the magnitude of...
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Resistors in Series vs Parallel
I am confused how I would add certain resistors, like the ones in the attached picture (sorry it's a bad picture). If I add the first two resistors as if they were in parallel (as they are), couldn't I...
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Falling stick(s) - initial force not equal to gravity?
Suppose we have two sticks held in a vertical plane, pivoted at one point (check the diagram). If we let go, why is the initial acceleration of the center of the mass not equal to g? Why does the pivot...
View Articlewhy there is no force acting in an object with constant velocity?
According to my level of knowledge,my point of view regarding an object moving with constant velocity is that there should be a force acting on it for its continuous motion(eg:when riding bicycle we...
View Articleq vxB magnetic force
there is something I don't understand maybe someone can tell me - a charge q has velocity v along the x axis - there is a uniform magnetic field B along the y axis - so the particule experience a force...
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Paradox in evaluating the Lorentz field in a dielectric
Can someone help me in understanding where I am wrong when thinking about the derivation of the Lorentz field in a dielectric. I give the derivation in italics (although the familiar reader should not...
View Articlewhat will be the cross section area of rod?
If a metal rod of 20 cm is charged with 10 μC, then what should be its cross section area so as to prevent electric discharge (electric breakdown) ?
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