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Physics : Recent Questions and Answers (Page 265)

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

Understanding the Path Integral Formulation

Currently, I am reading chapter 3 of Condensed Matter Field Theory, which is on the Path Integral formulation of quantum mechanics. The book denotes $Delta t = t/N$, where...

Asked on 06/13/2021

1 answer

Deriving Bernoulli's equation with the kinetic gas theory: Missing 1/2 factor

Inspired by Eugene Khutoryansky video about Bernoullis law (https://www.youtube.com/watch?v=TcMgkU3pFBY), I decided to put the thoughts and ideas from her video into mathematical terms. My derivation of Bernoullis...

Asked on 06/13/2021 by Susp1cious

0 answer

What is the relationship between the velocity of a wave source and the amplitude of a shock wave?

I'm having trouble understanding the kind of interference leading to shock wave formation and how it relates to the velocity of the wave source.I came across this image: ...

Asked on 06/13/2021

1 answer

Landau & Lifshitz's Approach (contour method) on the WKB connection formulas

Background of the question (see pp. 161, section 47 in Landau & Lifshitz's quantum mechanics textbook Vol3, 2nd Ed. Pergamon Press).We have the following potential well$$U(x)leq E...

Asked on 06/12/2021 by J.Yang

1 answer

First law of Thermodynamics and the definition of Internal Energy

From the Wikipedia page on internal energy I get the following definition $$U=TS-PV+summu_iN_i$$ Hence,$$dU=TdS+SdT-VdP-PdV+summu_idN_i$$ For constant pressure and temperature and when there is no...

Asked on 06/12/2021

1 answer

Cause of observed galactic red shift or acceleration in expansion of the universe: velocity vs gravity.

Scientist look out at the universe and observe red shifts for galaxies that are roughly proportionate from their distance from us and attribute it to a velocity away from us....

Asked on 06/12/2021

1 answer

Deriving the Electrostatic boundary conditions

When deriving the electrostatic boundary conditions for any charge distribution (to my knowledge at least), Griffiths in his textbook references this illustration: ...

Asked on 06/12/2021

1 answer

Why do tidal forces exist in black holes?

If a person (free)falls into a black hole at some point or the other, he will be stretches by a 'force differential' between the two ends of his body. This...

Asked on 06/12/2021

2 answer

Showing that equation has unique real solution

Let $epsilon_i$ be the internal energies of a microstate. We are supposed to show that the equation $$mathscr E = frac{sum_{i=1}^{N}epsilon_imathrm e^{-beta epsilon_i}}{sum_{i = 1}^{N}mathrm e^{-beta epsilon_i}}$$ has...

Asked on 06/12/2021

1 answer

When we move the fulcrum of a seesaw away from the center of mass, why can we calculate the torque with radius from fulcrum to center of mass?

In physics, the teacher showed us a question about balancing torque using an 8-foot seesaw that is 30lb with a 100lb person on one side, asking us to find how...

Asked on 06/12/2021

2 answer

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