The geometry of the universe is determined by the density of matter within the universe. Albert Einstein'stheory of general relativitydescribes how matter can curve space, so the matter's density can control the
General relativity is a physical theory about space and time and it has a beautiful mathematical description. According to general relativity, the spacetime is a 4-dimensional object that has to obey an equation, called the Einstein equation, which explains how the matter curves the spacetime. Wh...
In which direction does the electric force act on the electrons? Are electric fields denser when the curvature is greater? What is the magnitude of Earth's magnetic field? What are magnetic field lines? What is the unit of electrical potential energy?
fine-tuning at many levels. Inexplicably, nearly the entire energy-matter content of the universe is unknown to us. But most astonishingly, the fundamental quantum level of reality, discovered by chance, tells us outlandish stories about the nature of the universe. All our cherished intuitions ab...
Physically, a real surface is a continuous, polarized plane. About continuous surfaces, Gauss (1825/1827) wrote: “A curved surface is said to possess continuous curvature at one of its points A, if the directions of all the straight lines drawn from A to points of the surface at an infi...
The speed of light is incredibly high. Because the speed of light is squared in Einstein’s equation, tiny amounts of mass contain huge amounts of energy. Another result of the theory of special relativity is that as an object moves faster, its observed mass increases. This increase is neg...
What is the center of curvature? A compound pendulum(solid copper plate) swings in front of the magnetic field perpendicular to plate. What will be its effect? Will it stop suddenly or damping effect or no effect? What if plate has s What is constrained motion? What is meant by cantilever...
Energy–mass conservation requires that ρ∝a−3(1+ω), where ω=p/ρ is the equation of state of the different components: ω=0 for pressureless matter (or dust), ω=1/3 for radiation, and ω=−1 for ρΛ. 2.1. Cosmic acceleration Cosmic acceleration is defined as q≡(a¨/a)...
Looking at the curvature of the waveforms in the visualization we can see that the power in an AC system is not just voltage multiplied by current as in a DC system. It is defined by the time average of the instantaneous power over one cycle. This means that we must know the frequency...
What is Newtonian space-time? What is the time dilation equation? What is a singularity in space-time? Is space-time accelerating? How does space-time affect matter? Does space-time have volume? What does the velocity of a wave measure? What does space-time curvature mean? What measures ...