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Don Al's user avatar
Don Al's user avatar
Don Al's user avatar
Don Al
  • Member for 4 years, 10 months
  • Last seen more than a week ago
  • Reykajvik, Iceland
6 votes
2 answers
589 views

What do we exactly mean when we say that a problem has an analytical solution?

6 votes
3 answers
957 views

What's wrong with this "proof" that all Hamiltonians are time independent?

5 votes
5 answers
2k views

How does it make physical sense to define mass in terms of magnitude of the 4-momentum?

3 votes
1 answer
386 views

Why is d'Alembert's principle not as applicable in physics as the principle of stationary action?

3 votes
1 answer
320 views

Why can't $U=b\mathbf{v} \cdot \mathbf{r}$ be considered a potential for the drag force ${\bf F}=-b {\bf v}$?

3 votes
2 answers
977 views

Equation of motion for a particle under a potential in special relativity

2 votes
4 answers
2k views

Variable mass systems in Lagrangian mechanics

2 votes
1 answer
1k views

Coordinate transformation in the context of special relativity

2 votes
1 answer
848 views

Oscillator with quadratic drag

2 votes
2 answers
213 views

Conserved quantity for any motion in 1D

2 votes
1 answer
142 views

Would it be more insightful to teach students Lagrangian/Hamiltonian mechanics before Newtonian mechanics? [closed]

2 votes
2 answers
279 views

Acceleration without a force in special relativity

1 vote
3 answers
875 views

Kepler problem in cartesian coordinates

1 vote
0 answers
125 views

Is there a formula for finding pressure as a function of depth in the ocean?

1 vote
0 answers
198 views

Why introduce Lagrange multipliers? [duplicate]

1 vote
0 answers
127 views

Solving relativistic free EOM

1 vote
0 answers
61 views

How does one approach the $n$-body problem in general relativity? [duplicate]

1 vote
0 answers
465 views

Quantum mechanics of projectile motion [closed]

1 vote
1 answer
3k views

Simple pendulum from d'Alembert's principle [closed]

0 votes
1 answer
140 views

Do all even potentials produce periodic motion?

0 votes
3 answers
1k views

Are there any cases in classical mechanics in which Newton's second law fails?

0 votes
1 answer
384 views

Is there an angular momentum-angle uncertainty relation in Quantum Mechanics? [duplicate]

0 votes
0 answers
1k views

Derivation of Euler-Lagrange equations from Newton's second law [duplicate]

0 votes
1 answer
72 views

General solution for the motion of a 1D particle with drag

0 votes
1 answer
230 views

Projectile motion as realistic as possible (at least computationally)

0 votes
0 answers
124 views

Can classical mechanics be derived from the standard model of particle physics?

-1 votes
1 answer
87 views

Is the 4D Minkowski spacetime a physical and/or mathematical necessity?