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Physics : Recent Questions and Answers

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

What is the difference in deformation between a set of rigidly connected rigid bodies and a deformable body?

Consider this hinge joint: In particular, both linkages are rigid and the joint itself is rigid. While the system does...

Asked on 01/06/2022

1 answer

What optical resonator configuration produces the most output power for a laser?

For various reasons, I have a HeNe laser setup with two external spherical mirrors that I can position and align at will. I've looked around at various sources, which all...

Asked on 01/06/2022

2 answer

Is Lithium Plating possible at the cathode, too?

When talking about the Failure Mode 'Lithium Plating' in Lithium Ion batteries, in literature it is just described at the anode and I could not find answers to why it...

Asked on 01/06/2022

3 answer

Which experiment can differentiate a statistical mixture from a superposition state?

I am in trouble with polarization and entanglement. Let's consider three cases : Case 1) : Statistical mixture of $|Hrangle$ and $|Vrangle$ polarized photons Case 2) : Photons...

Asked on 01/06/2022

2 answer

Georgi statements about the symmetry breaking of $rm SO(10)$

Here is a paragraph with some statements about the Gauge Symmetry Breaking from Georgi's book Lie Algebras in Particle Physics 2nd ed -- From Isospin to Unified Theories (Georgi,...

Asked on 01/06/2022

0 answer

What is the point of a voltage divider if you can't drive anything with it?

The voltage divider formula is only valid if there is no current drawn across the output voltage, so how could they be used practically? Since using the voltage for anything...

Asked on 01/06/2022

8 answer

Why are simple models of coupled pendulums incapable of describing irreversible energy dissipation?

Consider two pendulums $A$ and $B$ coupled by a spring and also regard $A+B$ to be a completely isolated system. Let us start the system in an...

Asked on 01/06/2022

1 answer

Why Doesn't Thermal Radiation Render Thermionic Conversion Unable To Approach Carnot Efficiency?

Thermionic Conversion follows the classic Richardson-Dushmann Equation for thermionic current as a function of temperature squared: $$J_{RD} = A_0 T^2 expleft(-frac{phi}{k_B T}right)$$where$J_{RD}$ is the...

Asked on 01/06/2022

1 answer

What is the power while accelerating a bicycle?

With respect to this question, the power on a accelerated body, that moves in the same direction of the acceleration, can be calculated by $W = Fv$, where...

Asked on 01/06/2022

5 answer

Rotational motion and angular velocity

Why does $N=0$ when w=w critical? What does "Mass m falls away from the drum if N ≤ 0, when ω ≤ ωcritical" mean?I don't understand the...

Asked on 01/06/2022

2 answer

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