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Physics : Recent Questions and Answers (Page 81)

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

Confusion regarding variable light speed theories

Einstein and others have thought about VSL theories. But I am unable to understand how VSL theories can be consistent, for the following reasons: Don't we need some mechanism (like...

Asked on 08/31/2021

0 answer

General motion of a cone on an inclined surface

Suppose that a solid cone is placed horizontally on an inclined surface and is initially at rest. How will the cone move when it starts motion due to its weight?I...

Asked on 08/31/2021 by AMM

2 answer

Are there non-constant potentials that result in eigenstates of the Hamiltonian that are all plane waves?

It is commonly known that the eigenstates to the Hamiltonian of a constant potential are plane waves, aka $$V(r) = V_0 Rightarrow Hpsi = n text{ with }...

Asked on 08/31/2021 by Robin Dorstijn

2 answer

Why is the field quantization applied to the free particle?

This post claims that there is no real photon (particle) with a plane wave solution well-defined momentum state). It makes sense somehow to me. I can think of several...

Asked on 08/30/2021

2 answer

When two objects with a potential difference existing between them are connected by a superconductor, will the potential difference cease to exist?

We know that voltage/potential difference is the amount of work done or energy released by the battery/cell for transferring a unit charge for higher potential to lower potential. Now, when...

Asked on 08/30/2021

3 answer

Nusselt number for a rectangular fin under forced convention

I am looking for the correct Nusselt Equation to calculate the heat transfer coefficient for a rectangular fin acted upon by air with a certain speed...

Asked on 08/30/2021

0 answer

Interpretation of Hilbert space in the Wightman Axioms for QFT

My confusion is about the different Hilbert spaces we meet in QFT. In a first introduction to QFT, the Hilbert space is often taken to consist of wavefunctionals on classical...

Asked on 08/30/2021

4 answer

Use of angular diameter to determine distance in special relativity

Summary: at relativistic speeds, if you compute a planet's relative distance using angular diameter (roughly proportional to 1/angular diameter), will that computed distance increase or decrease linearly, assuming you are...

Asked on 08/30/2021 by user854

2 answer

Are the LIGO and VIRGO results consistent with the black hole statistics predicted by cosmology?

Have LIGO and VIRGO recorded enough gravity wave events to cross-check the black hole populations predicted by astrophysics and cosmology? Basically, we now have another experimental tool to verify the...

Asked on 08/30/2021 by KevinM

1 answer

Angular momentum and collisions/pure rolling

Consider a general problem of a rigid sphere having only rotational motion placed on a rough surface where it starts rolling after some time. And final velocity is asked. Friction...

Asked on 08/30/2021

1 answer

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