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Question 1

9votes

2answers

612views

Permanence of the basic forces

I am a highly interested layperson in Germany focusing on the fundamental principles that govern our everyday reality.I have a specific question regarding the permanence of the basic forces of ...

Leyla Katharina

107

askedyesterday

Question 2

0votes

0answers

54views

Which has most stable nucleus, Iron 56 or Nickel 62? [duplicate]

I want to know the exact answer, which has most stable nucleus iron 56 or Nickel 62

Dhona Rini

1

askedNov 5 at 14:42

Question 3

2votes

1answer

150views

If there wasn't a weak nuclear force, what would be the heaviest stable theoretically stable isotope with an equal number of protons and neutrons?

If weak nuclear force didn't exist, what would be the heaviest stable theoretically stable isotope with equal protons and Neutrons? For our universe the heaviest such isotope is calcium 40, but most ...

blademan9999

3,645

askedOct 25 at 7:15

Question 4

0votes

1answer

78views

Ball on semicircular rotating track minimum angular speed

I've had a look on the problem of a ball on a rotating circular track where the ball reaches a stable position at a fixed height that depends on the angular velocity and radius of the track only.For ...

user1583209

4,374

askedOct 4 at 22:31

Question 5

1vote

0answers

79views

Da Vinci bridge: why outer steps stay in place?

Consider Da Vinci's famous "boltless" bridge. (See image below*) Consider in particular an implementation with a significant 'arc', i.e. both ends start with a significant incline.How to ...

Hecatonchires

653

askedOct 3 at 9:26

Question 6

0votes

0answers

96views

What would be the dynamical consequences of a gravitational force scaling as $1/r^3$ instead of $1/r^2$? [duplicate]

In Isaac Newton’s formulation, gravitational force decays as$$F \propto \frac{1}{r^2}$$which explains planetary motion through Kepler’s laws. Newton effectively treated “weight” as the manifestation ...

Kuldeep Singh Meel

1

askedSep 18 at 6:21

Question 7

0votes

0answers

77views

How do I check the stability of a fluid velocity distribution?

Suppose we have a unidirectional velocity field, $\vec{u}=\left<0,u_\theta,0\right>$ incylindrical coordinates, whose azimuthal velocity is found by Navier-Stokes (negating advection, $\vec{u}\...

TMM

161

askedJun 22 at 3:23

Question 8

5votes

3answers

605views

Deadlift bar length and stability

My partner and I got into a debate about deadlift bar length and how she finds it less stable and more difficult to deadlift using a full length barbell with standard weight plates than with one of ...

Alex Clapacs

69

askedJun 19 at 15:10

Question 9

8votes

0answers

2kviews

Why do traffic jams happen even on a highway?

I was surprised to find myself in a traffic jam on a highway (it's a densely populated city). If we think of vehicles on a highway as particles flowing in a pipe, when the inflow exceeds outflow the ...

AlphaLife

13.5k

askedJun 3 at 5:12

Question 10

1vote

0answers

134views

Is observation of high energetic cosmic rays excluding possibility that parameters of the Standard Model are in a metastable vacuum?

Measurements of the Higgs and top mass allow us to establish constraints on the instability scale at which the Higgs potential starts to become negative, or, said similarly, meaning that there exists ...

Mathieu Krisztian

985

askedMay 4 at 7:17

Question 11

6votes

3answers

1kviews

A "paradox" in classical dynamics

Consider the following trajectory$$\dot{x}(t) = 1-\frac{x(t)^2}{x^2_0}.$$The solution to the above is as follows$$x(t) = x_0\coth\left[x_0t+\coth^{-1}\left(\frac{x_i}{x_0}\right)\right] \quad x >...

Dr. user44690

1,726

askedApr 30 at 11:12

Question 12

0votes

0answers

128views

Can there be no true vacuum and can we in principle do experiment about this?

I've searched a little bit on this site to find:(a) What does it mean for the Hamiltonian to not be bounded from below?(b) Why should energy have a lower bound but not an upper bound?(c) ...

YueZhi Zhang

17

askedApr 18 at 7:14

Question 13

1vote

0answers

89views

How could I model the Higgs effective potential with multiple minima?

In Higgs mass and vacuum stability in the Standard Model at NNLO, Eq. 52 gives the effective potential for the Higgs field as: $$\lambda_{\text{eff}}(h) = e^{4\Gamma(h)} \left\{ \lambda(h) + \frac{1}{(...

Adam P

359

askedMar 23 at 9:35

Question 14

1vote

0answers

62views

Finite volume for many-body system with attractive interaction

The study of many-body systems with attractive interaction, like those describing the matter we have around us, lead to prove their stability (see e.g. Dyson, Freeman J., and Andrew Lenard. "...

MBlrd

364

askedMar 17 at 21:21

Question 15

2votes

1answer

337views

Dzhanibekov effect on the Earth

Take an asymmetrical object and spin it in space and eventually it will flip on its own. A perfect sphere doesn’t have to worry about this, however the Earth is NOT a perfect sphere. My question is, ...

rclev

201

askedFeb 18 at 16:25

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Questions tagged [stability]

Permanence of the basic forces

Which has most stable nucleus, Iron 56 or Nickel 62? [duplicate]

If there wasn't a weak nuclear force, what would be the heaviest stable theoretically stable isotope with an equal number of protons and neutrons?

Ball on semicircular rotating track minimum angular speed

Da Vinci bridge: why outer steps stay in place?

What would be the dynamical consequences of a gravitational force scaling as $1/r^3$ instead of $1/r^2$? [duplicate]

How do I check the stability of a fluid velocity distribution?

Deadlift bar length and stability

Why do traffic jams happen even on a highway?

Is observation of high energetic cosmic rays excluding possibility that parameters of the Standard Model are in a metastable vacuum?

A "paradox" in classical dynamics

Can there be no true vacuum and can we in principle do experiment about this?

How could I model the Higgs effective potential with multiple minima?

Finite volume for many-body system with attractive interaction

Dzhanibekov effect on the Earth

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