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Physics : Recent Questions and Answers (Page 744)

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

What does $d$ stand for in this formula?

Context: I am building a tennis ball machine and am having trouble interpreting the following formula for the flight path of the ball. I know all of the other values...

Asked on 12/13/2020 by ShinyWhaleFood

2 answer

Photoelectric effect on charged plate

As far as I know, to observe the photoelectric effect, one has to expose a metal surface to high-energy radiation. But what happens if the surface has a surplus of...

Asked on 12/13/2020 by coolcat29

1 answer

Local charge conservation in quantum mechanics

The description of charged particles in electrodynamics obeys the continuity equation, $$ nabla cdot textbf{J} = -frac{partial rho}{partial t} $$ With the common physical understanding of this equation being...

Asked on 12/13/2020 by Reuel Dsouza

3 answer

Is gas flow always compressible?

From Franz Durst's Fluid Mechanics: An Introduction to the Theory of Fluid Flows:When a fluid element reacts to pressure changes by adjusting its volume and consequently its density, the fluid...

Asked on 12/13/2020 by FemtoComm

2 answer

Magnetic Boundary Conditions in case of surface current

I am working on the below problem:"A region shown below contains a perfect conducting half-space and air. The surface current Ks on the surface of the perfect conductor is...

Asked on 12/13/2020 by Amit Sonik

2 answer

Relation between spinors and anticommutation relation of fermions

I read that the state of a pair of particles is the tensor product of the single states of both, and you will get a wavefunction with the parameters of...

Asked on 12/13/2020 by Julian Ar.

2 answer

Why don’t we consider $g$ for a body along one dimension?

When a body is moving along a straight line path , we consider its acceleration in the formula.Then why don’t we also consider the force of gravity on that body.It...

Asked on 12/13/2020 by user277768

2 answer

Conservation of energy in explosion

Suppose a shell rested on a smooth surface fires a bullet horizontally ,generating some energy of explosion say E. I know that initially system(shell+bullet) has no energy. When the internal...

Asked on 12/13/2020 by Harsh Vardhan Singh

1 answer

Questions about plasma

Imagine if you were to heat liquid mercury until it reaches a plasma state. Would it be possible to completely separate the free electrons (ions) from the positively charged nuclei...

Asked on 12/13/2020 by Brian Ghilliotti

1 answer

2D Ising model entropy as a function of external field

I am trying to figure out what is the entropy expression as a function of the external field in a 2D Ising model with nearest neighbour interaction. My Hamiltonian is...

Asked on 12/12/2020 by BeastRaban

1 answer

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