# All Questions

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### Hurricane Emily

I need some help with my homework problem. In 1993 the radius of Hurricane Emily was about $350$ km. The wind speed near the center ("eye") of the hurricane, whose radius was about 30 km, reached ...
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### The wavelength of EMR reaching an orbiting ship at .99 c

In this answer John Rennie says that, if a ship is orbiting the Earth at .99 c: .. observer on the Earth sees time moving slowly for the astronaut, while the astronaut sees time moving fast for ...
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### Rainbow Black Hole

In the photon sphere of a black hole the photons are being trapped in orbit, pulled in and trajectories changed. Should we see color of the entire spectrum in the photon sphere? That a black hole ...
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### Magnetic force on a charged particle doesn't affect total energy

So there's this sentence in a book I am reading. It states "When a charged particle is placed within a magnetic field, despite the magnetic force acting on the particle, there will be no change in the ...
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### What are the Higgs masses for $SU(2) \times U(1)$ goes to $U(1)$ symmetry breaking with a complex triplet?

Consider an $SU(2)\times U(1)_Y\rightarrow U(1)_{EM}$ theory that is broken via a complex triplet with hypercharge 2. The potential is of the form \begin{align} V(\Phi) = -m^2\Phi^\dagger\Phi + ...
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### Why can an electric chargeless Z-particle decay in three photons?

The Z-particle that is supposed to convey the weak force has no electrical charge. So how is it possible the particle can decay in three photons. Because the weak and e.m. force are more or less ...
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### Principle of capacitor

It is said that second conductor reduces the potential of fist conductor and hence increases charge taking ability of first conductor My confusion... As per my limited knowledge it is electric ...
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### thermodynamics tables

Steam is heated from 10 kPa and 50°C to 550 kPa and 500°C. Calculate the change in entropy: 1) If the steam is not considered an ideal gas 2) Discuss if it is appropriate to consider steam an ideal ...
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### Contact Angle In Capillary

One Professor recently told me that in an insufficient length capillary, the contact angle doesn't change, its an inherent property which does not change. If the edges of capillary are extremely sharp ...
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### Conservation of $C$-Parity and $P$-parity

Under what situations are $C$-Parity $C=(-1)^{L+S}$ and/or $P$-parity $P=-(-1)^L$ conserved? ( $L$ here is the relative angular momentum and S is the total intrinsic spin). It would make sense that ...
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### Advantages of Lagrangian Mechanics over Newtonian Mechanics

Here, I'm going to pose a very serious list of doubts I have on Lagrangian Mechanics. Can we learn Lagrangian Mechanics without studying Newtonian Mechanics? Does Lagrangian help in solving problems ...
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### Why does it matter which way I put a battery into an electronic device?

If I take a battery, some wire, and a light bulb and hook them all in a circuit that would create a current and light the bulb. If I turned the battery around so the terminals were switched then I ...
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### How to understand the idea of functional renormalization group?

I have been looking at how to use the functional RG method in many-body systems, but I don't quiet get the idea of it, it look different from Wilson's RG approach (eg. why shall we integrate out the ...
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### Does the irradience on a surface change as the length scale of the surface patch approaches the wavelength of the incident light?

Imagine an ideal, square, surface patch with sides of length l and area a that is a perfect absorber. Imagine this patch is being illuminated by a monochromatic plane wave. The irradient power on ...
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### What do different frequencies in astrophysics data file mean?

I have a data file, with the first part looking like this. ...
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### What would happen if a black hole merged with a white hole of the same size?

I learned about white holes a while back, this was the first question that came to mind.
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### Could renormalization cutoffs be adjusted to explain absolutely any physical observation?

It seems like absolutely any observation can be expalined mathematically with no change to quantum theory except particular adjustments to renormalization cutoffs. Is this true? Example: Let there ...
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### Does travelling faster in time slows one in space?

Why it is said that if one travels faster in time then he will travel slower in space and vice-versa too ? I have made some approach but is it right ? What object wants in space-time trajectory is to ...
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### Telegraph process [on hold]

Wikipedia article on telegraph process This is all I know about telegraph process and want to calculate the mean and correlation. But I can't do it. Please help or suggest me some material.
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### Gravity and vibrational suppression

My question(s) relate to the source of gravity. Is it at all possible that the universe has a vibrational energy and that localized suppression of that energy by a mass acting upon it causes a force ...
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### Invertibility of Dirac matrices

Suppose we have Dirac equation in the following form : $i\partial_t\psi = (-i\vec{\alpha}\cdot \nabla +m\beta)\psi$ and assume that the Klein-Gordon equation is satisfied, i.e. \$\partial_t^2 \psi ...