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Physics : Recent Questions and Answers (Page 605)

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

Why does T-duality not create consistent string theories below the critical dimension?

As I know it, T-duality essentially tells us that if we compactify a superstring theory on a circle of radius $R$, it is equivalent to a string theory compactified...

Asked on 01/31/2021 by arow257

1 answer

How to estimate the Kolmogorov length scale

My understanding of Kolmogorov scales doesn't really go beyond this poem:Big whirls have little whirls that feed on their velocity, and little whirls have lesser whirls and so on to...

Asked on 01/31/2021

3 answer

Does Coulomb's Law, with Gauss's Law, imply the existence of only three spatial dimensions?

Coulomb's Law states that the fall-off of the strength of the electrostatic force is inversely proportional to the distance squared of the charges. Gauss's law implies that the total flux...

Asked on 01/31/2021 by Justin L.

7 answer

What direction is current for an electron in both $E$ and $B$ fields?

According to Fleming's left hand rule: I am a bit confused however in the case of an electron travelling in...

Asked on 01/30/2021 by Filthyscrub

2 answer

Debunking thought experiment purporting to show that gravity is not classical

As far as I know, there are no known observations that require a quantum theory of gravity. Now, that's not to say we don't need a quantum theory of gravity....

Asked on 01/30/2021 by nordic_skier

1 answer

What is the Lie algebra of ${rm U}(1)$?

Just a simple question: is it correct to say that the Lie algebra of ${rm U}(1)$ is formed by the generator $e^{i pi}$? Is it correct that ...

Asked on 01/30/2021

1 answer

Does this kinematics problem involve rotational motion?

I'm given the following problem:A javelin thrower standing at rest holds the center of the javelin behind her head, then accelerates it through a distance of 70 cm as she...

Asked on 01/30/2021

1 answer

If electromagnetic induction generates a potential difference in a loop, where are the "high" and "low" potentials?

In AP Physics, I learned that when a changing magnetic flux generates an electromotive force around a loop, and emf is measured in volts, where are the "high" and "low"...

Asked on 01/30/2021 by Ming-Tang

4 answer

What happens with the number of protons inside a wire in movement?

In Special Relativity we solve the problem of the moving wire with an electrical current saying the protons inside the wire have a higher density: hence the wire is not...

Asked on 01/30/2021 by Enrique

5 answer

What is the definition of velocity field of a fluid if not the velocity of the molecules of that fluid?

In the page 74 of Batchelor's fluid mechanics book, it is given thatDifferentiation following the motion of the fluid It will be evident that in a steady flow field a...

Asked on 01/30/2021

1 answer

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