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Physics : Recent Questions and Answers (Page 247)

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

What does "entropy" really mean?

I'm currently taking a course of introduction to biophysics in college and we currently covered a subject called entropy (S). We did some maths based on the Carnot cycle and...

Asked on 06/20/2021 by ArielK

2 answer

What is the entropy change of the universe for a rock if it falls from a height into a lake? The rock and the lake are at the same temperature

According to my textbook, the entropy change of the universe is $+mgh/T$. I'm confused about why this happens.after falling (without air resistance), wouldn't the rock possess $K_E...

Asked on 06/20/2021 by Milind Sharma

3 answer

Screened Coulomb potential in Debye-Huckel theory

I am rather confused about the meaning of the screened Coulomb potential in the Debye-Huckel theory. The potential of a unit charge inside an electrolyte takes the...

Asked on 06/20/2021

0 answer

Equation of Motion from Lagrangian: Expand the Lagrangian by orders of perturbation to get higher order equation of motion?

Just to state this first: I am not asking about higher order derivatives, so no jerk, snap, crackle or pop is involved here. I am asking about higher order perturbative...

Asked on 06/20/2021

1 answer

Relativistic Accelerating Frame (non-inertial frame)

One way to resolve the Twin paradox is to count in the effect of acceleration when velocity suddenly changes. I am therefore searching for a relativistic version...

Asked on 06/20/2021

3 answer

Why are some Cabibbo-Kobayashi-Maskawa (CKM) matrix elements equal?

I'm simply asking what theoretical origins are behind 'coincidences' in CKM matrix elements, such as the decay of charm to strange quarks, and the decay of up to down quarks...

Asked on 06/20/2021

1 answer

Lagrangian vs Eulerian Description

Is there any general proof that a Lagrangian description of a fluid always guarantees an equivalent Eulerian description and vice versa?...

Asked on 06/20/2021

0 answer

Lenz law in a stationary magnet

In this specific arrangement how do we find out the direction of current at different points of the rotation of...

Asked on 06/20/2021 by Ab sans

0 answer

How is the expression for Reynold's number valid in steady flow?

Reynold's number is defined as the ratio of inertia force to viscous force. A common expression for this inertia force is (density)x(Area of cross section of tube)x(velocity of fluid)x(velocity of...

Asked on 06/20/2021 by Azur Qasm

0 answer

Is Electric Field and Potential opposite in directions to each other?

Is Electric Field and Potential opposite in directions to each other? Does the -ve sign in the formula $$ V_{ba}=V_b-V_a=-int_a^bvec{E}cdot dvec{l}$$ imply the Potential and Field are in opposite...

Asked on 06/20/2021 by confused_Student

3 answer

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