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Physics : Recent Questions and Answers (Page 595)

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

How to calculate heat loss of a building using thermal inertia

I need to calculate the amount of heat that is lost in an hour. I know the temperature of the building the (effective) temperature of the outside and the...

Asked on 02/03/2021 by Rixte de Wolff

1 answer

Difference between 1PI effective action and Wilsonian effective action?

What is the simplest way to describe the difference between these two concepts, that often go by the same name?...

Asked on 02/03/2021

1 answer

Orthogonality relation for adiabatic Hamiltonian

Suppose we have a Hamiltonian dependent on a parameter.begin{equation}hat{H}(lambda)=hat{H}_{0}+lambda hat{V}end{equation}We study how the energy eigenstates vary with the parameter by solving,begin{equation}hat{H}(lambda)|n,lambdarangle=E_{n}(lambda)|n,lambdarangleend{equation}...

Asked on 02/03/2021 by Stephen Blake

1 answer

How much energy do you need to levitate/counteract gravity without any displacement or change in height?

I know you can't have work without any displacement, so I was kind of wondering as to what keeps, for example, a man on a jetpack, off the ground but...

Asked on 02/03/2021 by Qyo

5 answer

How can the Normal Force on an upside down roller-coaster car point upward?

Q: An amusement park proprietor wishes to design a rollercoaster with a vertical circular loop in the track, of radius $R = 20, rm m$. Before the cars reach...

Asked on 02/03/2021 by Ghost Repeater

5 answer

Quantum interferometer with floating mirrors

I send photons one at a time through a Mach–Zehnder interferometer with two detectors. Quantum superposition ensures that photons only reach one of the detectors. The interferometer is initially...

Asked on 02/03/2021

0 answer

Divergence theorem & Kinetic model of plasmas

In one section in my plasma physics notes (see below) on the Vlasov equation, 6D phase space & the kinetic model for plasma, I can't quite understand how (via Gauss's...

Asked on 02/03/2021

0 answer

Determine the electric field in the region enclosed by a spherical conductor and the surface charge density

Introduction Six point charges of magnitude $Q_0$ is evenly distributed on a sphere with radius $a$ and center in the origin. The six point charges have the cartesian...

Asked on 02/03/2021

2 answer

Fields: Fundamental and Physical, yet Unobservable?

I'm currently working through Robert Klauber's Student Friendly Quantum Field Theory, which by the way is much more accessible than other texts like, say, Peskin and Schroeder, for others also...

Asked on 02/03/2021 by EthanT

2 answer

Why is the pressure in quantum infinite wells the derivative of total energy, not potential?

Consider some quantum well of infinite depth, that is, for some region $R$,$$V(r)=begin{cases}0, quad r in Rinfty, quad r notin Rend{cases}$$...

Asked on 02/03/2021 by trytryagain

3 answer

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