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Physics : Recent Questions and Answers (Page 336)

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

Could LIGO detect an Alcubierre drive being used within 10 light-years of the Solar system?

Maybe this question is too speculative... But is it possible that LIGO would detect the ramp-up and ramp-down of an Alcubierre drive being used within 10 light-years of the Solar...

Asked on 05/15/2021

0 answer

Event horizon vs high gravitational field: How is it light can escape a gravity greater than the speed of light

Calculated event horizon using Schwarzchild radius for 10 Earth mass primordial black hole and get a diameter of 17.7336cm. Using spherical gravity calculation ofg=GM/r^2, I get gravity at...

Asked on 05/15/2021 by David Judge

3 answer

How to see the ${rm SO}(4)$ symmetry of the classical Kepler problem?

It is well-known that the hidden symmetry of the $1/r$-problem $$H=frac{{bf p}^2}{2m}-frac{k}{r}tag{1}$$ is ${rm SO(4)}$ in the sense that the components of angular momentum $L_i$ and...

Asked on 05/15/2021

1 answer

What is temperature on a quantum level?

When I was in high school, I learned that temperature is kinetic energy. When I learned statistical physics, we learned that temperature is a statistical thing, and there was a...

Asked on 05/15/2021

6 answer

Why is the electric field in the direction in which the potential decrease is steepest?

My question is, why is it necessary for the potential decrease to be steepest? We could simply say that the direction of the electric field is in the direction where...

Asked on 05/15/2021 by Isha Saraf

1 answer

Statistical Mechanics Partition Function

We know from Boltzmann's Distribution for the canonical ensemble that $overline{E}=frac{-partial{lnZ}}{partial{beta}}$, which for the translational degree of freedom comes out to be $overline{E}=frac{3NkT}{2}$.Later, we define average energy...

Asked on 05/15/2021

0 answer

Correspondence of an ensemble

Let $mathcal{E} = { p_i, psi_i }$ be an ensemble of quantum states where $p$ is a probability distribution, what exactly is its physical and mathematical correspondence? Is...

Asked on 05/15/2021

0 answer

Does Fraunhofer diffraction also automatically imply that the Fresnel approximation is simultaneously satisfied?

I am confused about the regimes of validity for the Fresnel and Fraunhofer diffraction approximations, and would appreciate some clarification. Let's say we are interested in calculating the field ...

Asked on 05/15/2021

1 answer

Integrating an equation of motion

My physics book says that the equation of motion $ 2 dot{r} dot{varphi} + r ddot{varphi} = 0 $ can be integrated once to give the equation $...

Asked on 05/15/2021

2 answer

Dirac's method of constrained systems applied to a system with a constant of motion

I have learnt that Dirac's method is used to deal with Hamiltonian systems with constraints between the phase-space variables, for example, $f(q,p)=0$ in a 1-dimensional case, where $f$...

Asked on 05/15/2021 by Sashwat Tanay

0 answer

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