Classical Physics

Let's tackle this with ideas first. You're implying rotation and linear momentum cannot be transformed from one to the other? That's ridiculous.

Anders Bjorkman has put out an open contract for a 1 million euros to create a scale model simulation of the trade tower collapse. I’ve been trying to recreate it but unsuccessful so far. How do I create a pancake collapse?

oh my god, I just learned about the beauty of science and the pursuit of knowledge! It feels sooooo good This is affecting my entire thought process, I cannot type this out fast enough. I have so many questions now! but it's hard because my ignorance keeps trying to pop its way back up!

I need some help with the calculus involved with current at right angles from itself. The picture shows a basic scenario where the calculation would apply, and a wire setup (fig5) to attempt to convey the next step. -DandelionTheory

In "The Wall" game show, the slots and also the diverters are designed symmetrically and also identically. So when a ball is dropped from a particular slot number it should end up in a particular amount. But how does the ball end up falling into different amounts on other subsequent tries even when the ball is dropped from the exact same position. The entire wall is glass enclosed so there is no air resistance. The ball is also dropped by machine,no manual input hence equal force of drop in every try. I don't know which factor affects the ball as it changes its path in every iteration even when it is dropped from the same slot. Can someone explain the science behind t…

I figure "magnetic lifter" was appropriate name for this problem. The question is: "What is the total Lorentz force on all currents? Is my math correct for total force on all currents?

In the case of equilibrium of hemispherical drop, what i know is that the surface tension is responsible for holding the hemispherical drop with the other hemisphere thus forming a spherical drop and the surface tension also holds the liquid on the curved surface thus giving it the curved shape. Why is force due to surface tension measured only along periphery(T2πr) whereas the surface tension exists also on the surface(2πr²) ?

So the electrical engineer who was doing this stuff for 50 years is wrong. The electrical engineer who solved computer crashes created by static electric discharges is wrong. Electricity only exists when a positive and negative charge make a connection. That negative charge cannot be created without creating a positive charge elsewhere. So when we prevent static electric damage, earth ground appears nowhere in that solution. Static electric prevention is always about making that connection from positive to negative charges via a path that is not destructive. It is even a standard experiment in physics class. Using Styrofoam balls to repel and attract. Ea…

First I will add some theory Then I will try to derive rydberg energy formula from a kinetic perspective The numbers above is correct for the rydberg formula. Is it possible to derive plancks constant, bohr radius or velocity for electron in n=1 for hydrogen atom with this? This is how far I get equating centripetal force and coulomb attraction:

the theory above from physics stack exchane made me puzzle a little One set of possible solutions to maxwell equations are It is known that deacceleration of an electron creates EM-waves. If you have a constant acceleration of an electron from a B field and stops the electron then all kinetic energy should be given out as an EM-wave so that Anyone have anything to add of an experiment that could determine the frequency this way?

We were playing a game at New Years where you hold a wine glass from the bottom and you put it over a ping-pong ball on a table. Then by moving your hand in a circular motion you can cause the ball to roll around the inside of the glass. You can then lift the glass and transfer the ball to another glass and the ball doesn't fall out of the glass so long as you keep up the circular motion. My understanding is that this works because the middle of the glass is wider than the rim of the glass and thus, while held upside down and moved in a circular motion the ball will move to the widest part of the glass. THE ARGUMENT - The next day I saw my nephew trying the same…

so current through a conductor induces an external magnetic field according to this site: https://nationalmaglab.org/education/magnet-academy/watch-play/interactive/magnetic-field-around-a-wire-i i understand current is described as a net motion of charge carriers in a conductor, but what about moving charge carriers that are fluid? my question is if the charge carrier was a chemical like copper sulfate, do the same rules apply if the copper sulfate's path of motion was confined to a pipe or tube? would the same rules that apply to current in a loop apply to copper sulfate moving in a coil/loop?

Would it be possible to convert a “broken” induction stove top into a electromagnet? If so how ? By broken I mean the glass top is damaged/ cracked but no other components apear to be damaged.

hi, that may be a stupid question, but I'm not sure about the answer.. is it really impossible to reduce the entropy of a gas ? Picture a cavity with a special shape (probably parabolas) where molecule would preferentially bounce in carefully selected directions.. it could also be some sort of tube, where when you put some gas at one end, molecules end up going all parallel at the other end.. I suppose what would be difficult is to make the speed of the particles uniform, but maybe if you use some material with a specific bouncing properties (i mean that molecules would bounce to different direction varying with their speed, and so you can filter them using only…

In the example 5.11 above I don't understand how they revert to the natural coordinates while going from (5.68) to (5.69). In (5.68) the direction is along the y-axis. In (5.69) it follows the angle that goes round the sphere. But this angle is normal to y when it is at the y axis and parallell to the y axis while it is at the x-axis. How is it possible to revert between the y-axis in (5.68) and the angular axis in (5.69)?

Hi I am stuck writing a novel. The protagonist is stuck outside a building being chased by the bad guys. He already tried to get into the building during the day but there was no way in. There are no doors windows or anything. My idea was he sees a lever or switch using a uv torch he is carrying but is this scientifically possible? Can anyone think of a better solution? The important thing is they are able to get in because it's night if that makes sense. Any help would be much appreciated. Max

In 5.55 they use Gauss law. In my proof of Gauss law they require that there is no holes on the volume of Gauss law. But in 5.55 there is a hole when the radius is 0. How can you create a proof for this rewriting then? I have the same issue in the electromagnetic gauss law: Then they introduce Gauss law even though the electric field E is undefined in origo I guess I in the end must add a derivation for Gauss law so that someone can point out how the proof is still valid for the theory above.

they refer to a product rule 5 for the second last equality above. This text is taken from David Griffiths, introduction to electrodynamics. If anyone is familiar with the book. At what page is product rule 5 that is used here introduced? I cant find that page. Or does anyone have another book or a internet site where this product rule 5 is derived? Or does anyone want to derive the second last equality above here on this page? On a further note I understand that So I understand how they obtain the left side of:

Above they derive that curl of B is uJ. I know they use the identity So since as underlined above that the derivatives of J is 0 we have that But my problem is why is the derivative of J 0 in general. I have looked at a derivation for this: And the end of this derivation is the following But in the derivation they use that acceleration is constant and that it is a function of E showed in the orange box above. But E does not have to be constant since it is a function of r? So how is this a general derivation for the fact that divergence of current density is 0?

And that question is... Would a moving object with infinite mass exert an infinite force on other objects? If so, why? If not, why not?

I would assume that if you bombard an object with photons that energy is exchanged? But, is a force exerted on the object? In the process? wondering if mass is needed to exert force and if so would relativistic mass be why photons exert a force in objects?

Hello. I'm playing around with the concept of air wells. I recently came across some information on rock piles that were built in ancient Greece to pull water out of the air via condensation that occurs in the cool center of the rock pile (60 feet in diameter and 30 feet tall). Can anyone help me figure out how to calculate the amount of water that could potentially be captured in a system like this? If you search for "Zibold Condenser" you'll get an idea of what I'm talking about. Mahalo, Chris

Hello, I am pretty new to the study of science and I was just reading an article on wikipedia about Newtons laws . I have a few questions on this and hoped somebody would kindly answer . From: https://en.wikipedia.org/wiki/Newton's_laws_of_motion What does it mean by a quantitative measure of force ? What is an inertial reference ? Is there a Law on acceleration ?

Well, I just had this thought some time ago, and I am curious about it. I would like to know if it is actually true or not. So, we all know about inertia, right? The resistance to acceleration, or change in motion. Well, there is also a concept about derivatives of acceleration, mainly jerk and yank. If you don't know, jerk is said to be the rate of change in acceleration, and yank a rate of change in force. Now, about inertia, here is the thought in question. If inertia resists acceleration, and therefore reduces it when a force is applied to something, would inertia not actually act as a yank, and thus jerk to acceleration, and thus reduce it when a force is a…

Let's picture a Rolling without slipping Wheel, that constantly accelerates. radius of a wheel/circle is rr. Basically any wheel of a vehicle is rotating around its fixed axis - AoR -(axis of rotation) Most of the times wheels have this AoR perfectly in the center of the circle/wheel/cylinder. What I want to understand is how can we describe the torque of such a wheel? Because as I understand we could go about finding torque for the center of the circle - point O. I am not sure if it's possible to find the torque for the point P, that is point on a line tangent to the circle on the surface level.