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Physics : Recent Questions and Answers (Page 276)

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

Do nuclei emit photons?

Generally in text books they say that when a electron goes from high energy state to a lower energy state it emits photons.My question is, it is possible that...

Asked on 06/08/2021

7 answer

Inferring features about the spacetime from a line element

Suppose $g_{ij}$ is a symmetric tensor describing the geometry of a 4d spacetime. Then I know for example, that if the metric contains "mixed terms" (like $dtdx$) then...

Asked on 06/08/2021 by mathripper

0 answer

Measurement of electrostatic induction

How is it with the electrostatic induction measurement? Everywhere you can read about the effect of electrostatic induction but I still can't found any detailed explanations or quantitative measurements. Perhaps...

Asked on 06/08/2021

1 answer

Gauss Law for Electric Fields

What is the integral form for the Gauss Law for Electric Fields? or ?...

Asked on 06/08/2021 by arthurg

2 answer

Equation of motion for rigid body dynamics with quaternions

I'm trying to understand the equation of motion for rigid body dynamics in the presence of a quaternion joint for the root of a humanoid robot. But the dimensionality inconsistency...

Asked on 06/07/2021 by soshi shimada

1 answer

Blackbody energy density spectrum in four dimensions

I don't know how to calculate the energy density in four dimensions. I know the density of states is$$g(varepsilon) = g_sfrac{4pi V}{h^3c^3}varepsilon^2; quad g_s = 2$$...

Asked on 06/07/2021 by Fito Meza

0 answer

External force and Conservation of energy

Suppose a body (say $5text{ }kg$) is kept at rest on a horizontal table of some friction coefficient (say $0.2$). If a force of $20text{ }N$ is...

Asked on 06/07/2021 by user262060

2 answer

Pendulum on an accelerating train with changing length

Based on my own research, I found a general solution that can model a pendulum found on an accelerating train. The following solutions are based on small angle approximations. F=-mgsin...

Asked on 06/07/2021

1 answer

Can the double pendulum equations not be derived solely using Newtonian Mechanics (Newton's Laws of Motion)?

I can't find an answer for whether the Double Pendulum equations can be derived solely using Newtonian Mechanics (Newton's Laws of Motion). The reason I ask for this answer is...

Asked on 06/07/2021 by Prithvidiamond

2 answer

Sign in infinitesimal Unitary transformations

When studying unitary transformations in QM, most of the textbooks I used defined the unitary transformation operator as $$ hat{U}(alpha) = e^{-i alpha hat{G}} , , , $$ where...

Asked on 06/07/2021

1 answer

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