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Physics : Recent Questions and Answers (Page 90)

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

Explain hydrodynamic Levitation

I had researched it and I saw everyone has there different answer. Someone says its Magnus effect, someone says it is Coanda effect and someone says its Bernoulli's principle. Can...

Asked on 08/26/2021 by Karanbir Singh

2 answer

Can there be a theoretical synchronised ‘now’ moment at all points across the universe?

Einstein’s relativity rejects the notion of a universal ‘now’ moment. It underlines how the concept of ‘now’ is compromised due to time passing at differing rates in differing frames of...

Asked on 08/26/2021

5 answer

"$10^{mathrm{th}}$" Index skipped in M-theory

Why is it that in M-theory, the 11-dimensional vectors are labelled with indices $0 dots 9,11$. For example, the spatial momentum components are $p_{1}, dots, p_{9}, p_{11}$. Why...

Asked on 08/26/2021

0 answer

Can a massive particle have zero charge without being made of electrons and protons?

I know a neutron decays outside the nucleus into a proton and an electron and also that a neutrino has no charge but is there a particle that simply has...

Asked on 08/26/2021

1 answer

What are all the known physical conjugate pairs?

According to the uncertainty principle, certain pairs of physical quantities are complementary variables. Wikipedia has a list:Energy <> TimeLinear Momentum <> PositionAngular Momentum <> Angular PositionMass-Momentum <>...

Asked on 08/26/2021

0 answer

Continuously feeding an evaporating micro-black hole?

What would happen if you created a micro-black hole and could continuously feed it as quickly as it evaporates? Is it possible that it would remain relatively stable? If...

Asked on 08/26/2021 by Jonathan Langdale

2 answer

Looking for a simplified explanation for why you cannot measure velocity and pin point location

Because of uncertainty, you cannot measure both velocity and exact position. Is this because when you measure the position of a particle, it is freezing it in its frame...

Asked on 08/26/2021

2 answer

Is atmospheric pressure balanced on an object as it moves?

Consider a box sliding along a friction-less floor at a constant velocity. Now typically atmospheric pressure is 14.7 psi on all surfaces of the object. But if it is moving...

Asked on 08/26/2021

1 answer

A problem related to metric variation

Under the coordinate transformation $bar x=x+varepsilon$, the variation of the metric $g^{munu}$ is:$$delta g^{munu}(x)=bar g^{munu}(x)-g^{munu}(x)=-frac{partial{ g^{munu}}}{partial x^{alpha}}varepsilon^{alpha}+ g^{mubeta}frac{partial varepsilon^{nu}}{partial x^{beta}}+g^{alphanu}frac{partial varepsilon^{mu}}{partial x^{alpha}}$$the right...

Asked on 08/26/2021

1 answer

Why don't the electrons in a paramagnetic material precess around an external field?

When a paramagnetic material is placed in a strong external magnetic field, then you'll find that the magnetic momenta of the electrons in the material will align to the field,...

Asked on 08/26/2021

1 answer

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