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Dries
  • Member for 7 years, 3 months
  • Last seen more than a week ago
511 votes
6 answers
60k views

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

307 votes
1 answer
118k views

Resource recommendations [closed]

  • 74k
164 votes
2 answers
36k views

Why do sunbeams diverge even though the sun is much more than a few kilometers away?

149 votes
2 answers
17k views

Why does a mirror split my laser beam?

  • 1,464
95 votes
9 answers
22k views

Can we theoretically balance a perfectly symmetrical pencil on its one-atom tip?

  • 2,627
91 votes
9 answers
36k views

Why does matter exist in 3 states (liquids, solid, gas)?

87 votes
2 answers
12k views

In the earth's crust, why is there far more uranium than gold?

85 votes
2 answers
23k views

Why don't fluorescent lights produce shadows?

85 votes
9 answers
13k views

What really causes light/photons to appear slower in media?

  • 2,382
84 votes
24 answers
91k views

List of freely available physics books

  • 1,085
75 votes
4 answers
33k views

What is the mechanism behind the slowdown of light/photons in a transparent medium?

  • 953
71 votes
5 answers
142k views

Do low frequency sounds really carry longer distances?

  • 813
71 votes
2 answers
21k views

How to measure the wavelength of a laser pointer?

70 votes
3 answers
9k views

What makes cheese so effective at absorbing microwaves?

67 votes
6 answers
16k views

Why do we still need to think of gravity as a force?

  • 1,599
62 votes
3 answers
18k views

How is 6W equivalent to 40W, as claimed by adverts for LED light bulbs?

  • 689
58 votes
5 answers
31k views

Why is technetium unstable?

51 votes
4 answers
7k views

Why do rocket engines have a throat?

  • 3,529
47 votes
5 answers
7k views

Why is the prospective new kilogram standard a sphere?

47 votes
10 answers
8k views

Without the Michelson-Morley experiment, is there any other reason to think speed of light is the universal speed limit?

45 votes
4 answers
7k views

Why is water evaporated from the ocean not salty?

45 votes
2 answers
5k views

Did NIST fudge this news story about absolute zero?

  • 516
42 votes
5 answers
4k views

Why do we need coordinate-free descriptions?

41 votes
3 answers
7k views

History of interpretation of Newton's first law

30 votes
4 answers
10k views

Why is Newton's first law necessary?

24 votes
5 answers
68k views

What is the cause of rolling friction? & why is it less than sliding friction?

22 votes
1 answer
1k views

How come I never see cosmic rays in steam like they appear in a cloud chamber?

  • 2,585
18 votes
1 answer
3k views

Mechanics + Thermodynamics: Bouncing Ball

  • 14.3k
13 votes
5 answers
7k views

Where can I find public domain astronomical pictures?

  • 2,032
13 votes
5 answers
27k views

How do you determine power flow direction in a transmission line?

  • 2,602