When you deal with massive bodies like the Earth, however, which has a mass of 6 x 1024 kilograms (see How much does planet Earth weigh?), it adds up to a rather powerful gravitational force. That's why you're not floating around in space right now. The force of gravity acting on ...
Faraday's law, Coulomb's law, and the Lorentz force law, we have everything we need to understand the classical behavior of the electromagnetic field. Among these laws, Lenz's law and Faraday's law work together to describe how the magnetic field in your PCB is related to theRead Article...
Given that we are talking about a theory of physics, the Lorentzian arc length is the one that has physical meaning in the theory; the Euclidean arc length does not. So using the term "arc length" for the Euclidean one in the context of the physical theory is at least as confusing as...
When we measure the speed of a car, we seem to be measuring speed with something abstract called time; we are actually just comparing a known motion (of the sun) with an unknown motion of the car. Time is a way to compare or describe different kinds of motions like the speed of light...
observable reality, which means that in the case of space-time both spatial and temporal coordinates are observable parameters, emerging from an underlying reality. In the case of time this raises the question: Does the fact that something is past, present or future imply that it is something ...
If we were to run a quantum-physics simulation every time we flash an LED, we would never get anything done. Yet, many of these shortcuts and rules-of-thumb were created in times past , when the electronics industry was radically different than what it is now. ...
These three laws describe three physical constants that remain central to modern physics: Intertia, which states that bodies will remain in a state of motion unless an external force speeds them up or slows them down; Force, which can be summarized mathematically as the mass of an object multi...
In attempts to describe how GR can affect distant bodies seemingly without delay, relativists often speak of the field of a body as if it were a rigid extension of the body itself If such a “static” field has no moving parts, it then would have no need of a propagation speed unless...
“The external field effect is a unique signature of MOND that does not occur in Newton-Einstein gravity,” McGaugh said. “This has no analogy in conventional theory with dark matter. Detection of this effect is a real head-scratcher.” ...
important role it plays in physics, astronomy and cosmology. Put simply, light moves at incredible speeds and is the fastest moving thing in the Universe. Its speed is considered a constant and an unbreakable barrier, and is used as a means of measuring distance. But just how fast does it...