Recent content by PhyGuru

Concept of temperature does put things in the right context. The lowest energy state where the matter cannot transfer energy to other matter because it is not vibrating fast enough, is called absolute zero in thermodynamics (which studies phenomena at molecular level.) Atoms in motion is...

If somebody asks about the direction of motion of electrons, specially at last orbital then do not bring up antimatter. The motion of electron in the orbitals was initially modeled as similar to the motion of planets around the sun. (Niel Bohr's model) In quantum mechanics it is described as...

Brian Green discusses the philosphy/science of empty space in the book: The Fabric of the Cosmos: Space, Time, and the Texture of Reality His handling of the Newton's spinning bucket in an absolute/empty space would give you some insight into "empty" space.

Theory of one electron! ... so if a positron finds this electron and aniihilates it, it would destroy the whole universe! isn't it?

Without involving density... Any object, wholly or partly immersed in a fluid, is buoyed up by a force equal to the weight of the fluid displaced by the object. Greater the volume of the displaced fluid, greather is the force. If this force is greater than the weight of the object, it...

if the object is floating (DensityObj <= DensityFluid): Weight of displaced water = weight of the object Else Weight of displaced water = volume of the submerged portion of object * Density of water

You are looking at the principle of buyoncy, the initial condition is that the object is floating/swimming, density of object <= density of fluid. In th other case (iron block) when it sinks, density > density of fluid.

You are missing the point, the thing is you don't have to know the density of the object that is (swimming/floating) The point is the object (ship) is imparting its weight on the water moving away (displacing) that much amount (weight of water). You can arrive at the volume of the displaced...

Assuming a 2 dimensional space, you want to split it up in a grid/ coordinate system. You want to have an object "fan" that defines a force field as a function of ball's distance/location/direction from it. You want to define obstacle object (wall) as an array of points i.e a line. You...