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Physics : Recent Questions and Answers (Page 19)

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

Does the logarithm of a non-dimensionless quantity make any sense?

A train consists of an engine and $n$ trucks. It is travelling along a straight horizontal section of track. The mass of the engine and of each truck is...

Asked on 12/03/2021

6 answer

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 12/03/2021

2 answer

Modelling an inelastic, rough, constrained collision

Understood situations: a) Inelastic, rough collision of free spheres In such a collision, two coefficients are used. The coefficient of restitution in the normal direction (the ratio $c_N$ of...

Asked on 12/03/2021

3 answer

Derivation of the acceleration of an observer through direct use of the Lorentz transformation

In his paper "Uniformly accelerated reference frames in Special Relativity", E. Desloge describes the acceleration of an accelerated observer through what he refers to as a direct...

Asked on 12/03/2021

2 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 12/02/2021

1 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 12/02/2021

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 12/02/2021

1 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 12/02/2021

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 12/02/2021

0 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 12/02/2021

0 answer

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