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Physics : Recent Questions and Answers (Page 309)

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

Why will fluid particles always move along streamlines in a steady flow?

It is stated at numerous places that in a steady flow, all particles move along the streamlines, i.e. streamlines and pathlines coincide. For example -...

Asked on 05/25/2021 by Devashsih Kaushik

2 answer

Doubt regarding SHM in a U-Tube using energy conservation

While finding the SHM equation for liquid in a U tube using energy conservation, we have:$$E=K+U tag{1}$$$$K=frac12Mv^2$$where $v=dot{y}$ ...

Asked on 05/25/2021 by GreasyToothBee

2 answer

Demonstration of the Brans-Dicke's Lagrangian

The Lagrangian in general relativity is written in the following form:$$begin {aligned}mathcal {L} & = frac {1} {2} g ^ {mu nu} nabla_{mu} phi nabla_{nu} phi-V...

Asked on 05/25/2021

1 answer

Multiplicative inverse of Weyl symbol and invertibility of operator

If the Weyl symbol $A_W$ of an operator $hat{A}$ has a multiplicative inverse at every point of the phase-space, can I conclude that $hat{A}$ is invertible?...

Asked on 05/25/2021 by ilp

0 answer

How to calculate total power generated?

I have a circuit with a piezoelectric transducer which converts mechanical energy to electrical. The ceramic is connected to a 1 Megaohm resistor and a voltmeter which reads voltage. ...

Asked on 05/25/2021 by ARJ

1 answer

Why is the angular momentum form of Newton's second law used in rigid body rotation?

I'm currently studying 2D rigid body dynamics. To describe the translational motion of a 2D rigid body, the linear momentum form of Newton's second law is used: $$vec{F}_{rm ext}=m_Gvec{a}_{G/O}$$...

Asked on 05/25/2021 by roflmfao

2 answer

Dimensional regularization of Electron self-energy from Ryder's book

I am Studying Electron self-energy using Ryder's textbook, In page 334 we can seeDefining $k'=k-pz$ and avoiding the term linear in $k'$(because it integrates to zero) gives...

Asked on 05/25/2021

2 answer

How to stop a heat ray gun

What material would be best suited to create a shield to protect from the new heat ray gun?...

Asked on 05/25/2021

2 answer

How entropy (thermodynamics) related to time flow?

In Tenet (2020), Laura speaks about inverted bullets:Laura: It's inverted. Its entropy runs backward. So, to our eyes, its movement is reversed. We think it's a type of inverse radiation...

Asked on 05/25/2021 by David Anderson

1 answer

Is there a difference between a diffraction pattern and an interference pattern?

I am in high school at the moment and I am revising a section on waves. I am slightly confused by some things in our notes, which I would like...

Asked on 05/25/2021 by UnrulyTank

2 answer

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