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user35734
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34 votes
7 answers
10k views

Why does a system try to minimize potential energy?

9 votes
2 answers
2k views

Is the Planck length the limit below which our physics does not make sense? And if so, why is that true?

5 votes
2 answers
5k views

How do you find the projection operator onto an eigenspace if you don't know the eigenvector?

4 votes
2 answers
1k views

Michelson interferometer interference pattern [duplicate]

3 votes
2 answers
795 views

Confusion with rotation operator definition in Shankar

2 votes
2 answers
898 views

Coherence length interference pattern

2 votes
2 answers
5k views

Why is a paramagnetic material attracted into a magnetic field?

2 votes
3 answers
3k views

Why are the x-components of the stress tensor ($\sigma_{xx}, \sigma_{yx}, \text{and } \sigma_{zx}$) different?

1 vote
1 answer
2k views

Why can arbitrary two qubit density matrices be expressed in this form? [duplicate]

1 vote
1 answer
2k views

Explanation of the liquid rope coil effect