I have read these questions: Why do quarks have a fractional charge? Is there an explanation for the 3:2:1 ratio between the electron, up and down quark electric charges? Hypercharge for $U(1)$ in $SU(2)times U(1)$ model Is there any idea…

# Category: Physics

Category Added in a WPeMatico Campaign

## A question on $pi=iCRT$

I was given this pretty basic question about the osmotic pressure: 1) At 25$^{circ}$C what osmotic pressure would develop across a membrane permeable to water but not starch if there was 300 mM starch on one side and 100 mM…

## What causes fluctuations in the inflaton field value?

From this article During inflation there are quantum fluctuations in the inflaton field. And this The field φ experiences quantum fluctuations, as the uncertainty principle tells us it must. And this However, the field φ, like every other field, is…

## Does light lose energy when it reflects from a surface?

When light reflects from a surface, at least the direction of its momentum changes. Since the total momentum must be conserved, there has to be something going on within the atoms of the surface. So my question is that does…

## s-wave radial equation for minimally coupled scalar field

I am trying to work through the calculations from the following article. I need to find the s-wave radial wave equation for a minimally coupled scalar field, given by $partial_{mu}( sqrt {-g} g^{mu nu} partial_{nu}phi ) = 0$, for the…

## Rotate bucket with and without water in vertical circular path -minimum velocity and tension in rope and normal force

Part A . I am rotating an empty bucket in a vertical plane. Assume constant speed all throughout the circular path. . The empty bucket weighs Mb kgms. The rope radius is say R meters.What is the minimum velocity so…

## Young’s double slIt expy

Given two slits a distance 2mm apart, 1.33m from a screen. With a monochromatic light of frequency 4.10¹³Hz What’s the value of the fringe separation??

## How can a gas produce gravity?

I’m asking this because, I heard that the gas does produce gravity. So, how does actually works? What’s the phenomenon for gas producing gravity? Because, all what I want is a clear explanation in this.

## It is possible to build an artificial zero gravity machine?

I’m asking this because, we humans are an intelligent race, and age by age we invent something new. Do think that the inventing of zero gravity machine it is possible but in a very distant future?

## The joy of a good conference

One of the greatest perks of academia is the thrill of presenting work at international conferences. Although the best conferences always seem to fall at the busiest moment in the teaching semester (a pet peeve) and the travel can be…