Gravity Field Measurment / Refresh Rate of Sensors
Hi Reading another post about the inverse square law by trewsx7 on this forum, I had the idea that maybe the gravity field isn't constant at some parts. Imaging a 2-dimensional gravity field produced...
View Articlesensitive barometer indicating altitude
This is a cry for help. I posted a question under General Physics, titled Sensitive Barometer to Show Altitude on 13 June and have received no replies yet.
View Articlederiving del cross A in Electrodynamics
Hello, I am trying to derive the equation for the B-field due to a moving charge. ~ Griffiths Chapter 10, equation 10.66. I have been trying to do the del cross A and simplify . Things get messy and...
View ArticleMagnetic field question
This is a problem from Reitz-Milford-Cristy-Problem 9.15(fourth Ed.) , I know the answer but I do not know how to justify it.There is a long wire carrying a current "I" above a plane,inside the plane...
View ArticleIs this a fair comparison? (Electromagnetic waves)
I remember having great confusion when I first read about electromagnetic waves. I remember being introduced to a historical text about ether when I was a child, and thinking it was an unsolved puzzle....
View ArticleRelation of Energy with Work
Hello all. This is not a "What is Energy" Thread but rather a question about its relation with work. I understand that energy has been defined as the ability to do work. So why is change in energy is...
View ArticleConfusion regarding notation of instantaneous velocity wrt something.
I know that v(t)=dx/dt Then what is v(x) and how? Is it also dx/dt or something else?
View ArticleBreaking the coherence of an optical signal
Hi, I am curious to know if there any passive (or simple active) methods to convert a very coherent signal into an incoherent one? I suppose I would need to find a way to chirp the signal and a...
View ArticlePhysics Work Question
Hi, So I was able to answer both of these questions eventually, but the second one gave me some trouble. At first, I tried finding the force that the spring would be applying at that stretched length...
View ArticleAmbiguity in second law of thermodynamics
The second law of thermodynamics essentially states (paraphrased) that the universe always moves from order to disorder (increase in entropy). The problem I have with this, though, is that there is no...
View ArticleClik here to view.
pendulum connected to pulley system
Imagine a standard pendulum. I understand how to work the physics on one but what if you attached that pendulum to a pulley at the top and could apply tension through the line? Let's say you released...
View ArticleDerivation of Energy Function
A potential energy function for a two-dimensional force is of the form U = 3.21x3 y - 5.79x. Calculate the force that acts at the point (1.47m,1.42m). Enter the x-component first and then the...
View ArticleQuestion about Eötvös experiment
I do not understand the concept. Let the centrifugal forces on the two objects are F1 and F2. The rod will not rotate because net torque is 0. That is, F1r1=F2r2. That Does that mean we have to...
View ArticleDoes decreasing pressure of fluid in a fixed volume lower temperature?
Sorry if the formulation is imprecise, I'm a biology major trying to study some physics. The question is: Quote: 569. When comparing two points of fluid flowing through the same horizontal pipe, if the...
View ArticleAudio Source Moving @ Supersonic Speed
Let's say I have an indestructible speaker and I launch it out of a cannon at Mach 1.5 while it's playing music. (To make things simple, it also has an iPod and battery attached to it.) If the speaker...
View ArticleRayleigh number for vertical cylinder with free convection
Hi @ all, i want to simulate the cooling behavior of liquid aluminum in a vertical cylinder(simplified geometry of a real transport crucible), the cylinder is cooled down by the surrounding air from...
View Articlewhy is the electric field zero inside the DEES of a cyclotron?
why is the electric field zero inside the DEES of a cyclotron????????
View ArticleClik here to view.
rotational energy conservation
Hi, I am a little confused about the energy conservation of a pin ended free falling rod. When i try to derive energy conservation equation i am not sure including angular and linear velocity at the...
View Articlephoton as a particle and e-ray and o-ray
Wiki in birefringence says, "light with linear polarizations parallel and perpendicular .... the component with polarization perpendicular to this axis will be refracted as per the standard law of...
View ArticleReference frame for analyzing ball rolling down incline
Hi all, I have a question about how to analyze the problem of a ball rolling down an incline plane. Assuming there is friction, at each instant the ball swivels about a pivot point on the incline that...
View Article