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Helder Velez
  • Member for 11 years, 7 months
  • Last seen more than a month ago
  • Lisbon, Portugal
511 votes
6 answers
60k views

Can I compute the mass of a coin based on the sound of its fall?

157 votes
15 answers
40k views

What is a field, really?

  • 1,729
140 votes
6 answers
21k views

Why do people categorically dismiss some simple quantum models?

  • 5,173
110 votes
9 answers
20k views

Why is quantum entanglement considered to be an active link between particles?

92 votes
20 answers
178k views

What software programs are used to draw physics diagrams, and what are their relative merits?

90 votes
14 answers
9k views

Superluminal neutrinos

  • 13.2k
84 votes
24 answers
91k views

List of freely available physics books

  • 1,085
73 votes
5 answers
18k views

Is the CMB rest frame special? Where does it come from?

  • 3,275
72 votes
12 answers
15k views

Is the wave-particle duality a real duality?

  • 1,445
72 votes
7 answers
9k views

Does a charged particle accelerating in a gravitational field radiate?

  • 2,465
71 votes
7 answers
71k views

What is the difference between Newtonian and Lagrangian mechanics in a nutshell?

  • 891
66 votes
2 answers
4k views

What are the proposed realizations in the New SI for the kilogram, ampere, kelvin and mole?

64 votes
7 answers
11k views

Why does everything spin?

  • 649
56 votes
7 answers
10k views

Does a constantly accelerating charged particle emit EM radiation or not?

55 votes
13 answers
40k views

Why and how is the speed of light in vacuum constant, i.e., independent of reference frame?

  • 5,037
53 votes
49 answers
13k views

Common false beliefs in Physics [closed]

  • 1,029
48 votes
8 answers
27k views

Why is the gravitational force always attractive?

  • 1,662
48 votes
1 answer
5k views

Why does this object periodically turn itself?

  • 515
48 votes
8 answers
8k views

Does Gödel preclude a workable ToE?

  • 1,085
46 votes
6 answers
6k views

Does Heisenberg's uncertainty under time evolution always grow?

  • 22.8k
45 votes
2 answers
29k views

Can anybody provide a simple example of a quantum computer algorithm?

  • 2,144
45 votes
5 answers
8k views

Why do physicists believe that there exist magnetic monopoles?

  • 555
39 votes
4 answers
88k views

How fast do electrons travel in an atomic orbital?

  • 391
37 votes
3 answers
30k views

Best Sets of Physics Lecture Notes and Articles [closed]

  • 1,021
35 votes
3 answers
3k views

Why do we need complex representations in Grand Unified Theories?

  • 9,301
34 votes
1 answer
9k views

How to define orbital angular momentum in other than three dimensions?

  • 9,162
34 votes
6 answers
4k views

Could gravity be an emergent property of nature?

  • 13.2k
33 votes
8 answers
9k views

What determines which frames are inertial frames?

33 votes
3 answers
1k views

The Pioneer anomaly finally explained?

33 votes
10 answers
8k views

How can it be that the beginning universe had a high temperature and a low entropy at the same time?

  • 9,162
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