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Physics : Recent Questions and Answers (Page 653)

Find answers to your questions about Physics or help others by answering their Physics questions.

Positive Definiteness of Killing Form in Gauge Theory

This question is related to requirement that the gauge group of a gauge theory be a direct product of compact simple groups and $U(1)$ factors but is not the...

Asked on 01/14/2021 by Richard Myers

1 answer

Variational method: Why do parameters differ for two trial functions (optimization)?

Below the potential and trial functions:$$V(x)=(x^2-1)^2-x^2$$Use the variational method with the two trial wave functions:$$psi_{pm}(x)=Aleft(e^{-frac{(x-x_0)^2}{2sigma^2}}pm e^{-frac{(x+x_0)^2}{2sigma^2}}right)$$Where $A$ is the normalisation constant and $x_0$ and...

Asked on 01/14/2021 by Sant Man

2 answer

Wave created on water due to object impact

Let a spherical object of mass ? and volume ? be dropped in water from height ℎ, with an energy E and ? be the amplitude of the wave generated....

Asked on 01/14/2021 by Taiyo Hozack

0 answer

Collapse of the wavefunction after measurement

I learned during my study that when we make a measurement of a wavefunction then the wavefunction will collapse to one of its eigenfunctions with an eigenvalue. It is also...

Asked on 01/14/2021 by Shine kk

3 answer

Spin connection equations of motion from Einstein-Palatini action

I am working through "Supergravity" from Freedman and Van Proeyen. In exercise 8.11 one is tasked to vary the Einstein-Palatini action$$ S = frac{1}{2kappa^2}int d^Dx e e^mu{}_a e^nu{}_b...

Asked on 01/14/2021 by Lactose

0 answer

How to prove that $sum_{n=1}^{infty} | phi_n rangle langle phi_n | = hat {I}$?

Imagine discrete orthonormal basis made of infinite set of kets $|phi_1rangle , ..., |phi_nrangle,...$Completeness or closure of the basis is given by: $sum_{n=1}^{infty} | phi_n rangle langle...

Asked on 01/14/2021 by Abdul Qadeer

1 answer

The Integral Equation for Stokes flow

I am trying to understand and rederive why "The Integral Equations for Stokes Flow" is convoluted over just the surfaces of the rigid boundaries, and not the entire fluid volume....

Asked on 01/14/2021 by FluidMan

0 answer

Energy in the Ising model for liquid-gas transition

I am teaching myself statistical mechanics using the lecture notes of Professor Leonard Susskind. I am confused about a statement 'reducing $h$ reduces the density' at page $555$....

Asked on 01/14/2021

0 answer

Temperature on the surface of the sun calculated with the Stefan-Boltzmann-rule

In a German Wikipedia page, the following calculation for the temperature on the surface of the Sun is made: $sigma=5.67*10^{-8}frac{W}{m^2K^4}$ (Stefan-Boltzmann constant) $S = 1367frac{W}{m^2}$ (solar constant) $D...

Asked on 01/14/2021

2 answer

How many forces are acting on a projectile when it is passing through the highest point in the trajectory if air resistance is ignored?

This is a projectile motion question and the question basically states that an object is launched at $45$ degrees with an initial velocity of $28m/s$ east. So, how...

Asked on 01/14/2021 by Negrawh

3 answer

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