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niels nielsen

corvallis, oregon, united states

physics enthusiast and electric bassist, recovering ex-engineer (there's a 12-step program for that but it's notoriously ineffective). Tries to answer questions on the stack exchange in order to help people and improve his game. Website full of weirdly cool stuff he's done at www.nielsenkillowatt.com

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Top Questions
32 votes

Why is quantum gravity non-renormalizable?

quantum-field-theory general-relativity cosmology renormalization quantum-gravity asked Jun 30, 2019 at 3:58
physics.stackexchange.com

9 votes

Emergence of spin from special relativity

quantum-mechanics special-relativity particle-physics angular-momentum quantum-spin asked Sep 11, 2021 at 5:51
physics.stackexchange.com

9 votes

Is aspect ratio efficiency related to the momentum added to the air?

wing drag asked Sep 4, 2018 at 8:47
aviation.stackexchange.com

9 votes

What's up with the long exhaust stack I saw on a Cessna Caravan?

aircraft-identification feature-identification turboprop cessna-208 asked Sep 5, 2021 at 4:45
aviation.stackexchange.com

8 votes

help identifying a vacuum tube

vacuum-tubes asked May 30, 2019 at 22:02
ham.stackexchange.com

8 votes

What are the design principles that result in thin, long-span, narrow chord main rotor blades?

helicopter engine-design blade aspect-ratio asked Dec 6, 2021 at 0:14
aviation.stackexchange.com

6 votes

do relativistic velocities change the apparent entropy content of the moving object?

special-relativity entropy asked Feb 9, 2014 at 22:00
physics.stackexchange.com

6 votes

Can electromagnetism be used to generate gravity?

electromagnetism gravity asked Sep 11, 2018 at 17:38
physics.stackexchange.com

5 votes

computer control for Yaesu FT-450

yaesu remote-control computer-control ft-450d asked Nov 6, 2017 at 5:52
ham.stackexchange.com

5 votes

Area of a Rindler horizon

general-relativity asked Jun 27, 2017 at 4:49
physics.stackexchange.com

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Top Answers
175
Why do fans spin backwards slightly after they (should) stop?
physics.stackexchange.com

167
Why do spaceships heat up when entering earth but not when exiting?
physics.stackexchange.com

143
Why does a sticker slowly peel off, but if it is pulled quickly it tears?
physics.stackexchange.com

133
Why bother buying efficient lights if you are already heating your house?
physics.stackexchange.com

109
Why doesn't the road lose its thickness to the tyre?
physics.stackexchange.com

104
Why do rain drops fall with a constant velocity?
physics.stackexchange.com

77
Why does the humidifier make a stove's flame orange?
physics.stackexchange.com

76
Why can we distinguish different pitches in a chord but not different hues of light?
physics.stackexchange.com

69
Why do fusion and fission both release energy?
physics.stackexchange.com

63
What is meant by "gravity waves we see at sea surface"?
physics.stackexchange.com

58
Do bubbles get created when you move something in water?
physics.stackexchange.com

57
Emissitivity of copper - Why are copper heatsinks all shiny?
physics.stackexchange.com

56
What prevents a small plane like a Cessna or Piper from flying as high as a jet?
aviation.stackexchange.com

56
Are the physical structures in our sun of comparable complexity to those in the human brain?
physics.stackexchange.com

53
Why does pressure in a thermos increase after shaking up hot water and soap?
physics.stackexchange.com

52
How can Planck's constant take different values?
physics.stackexchange.com

51
Why does the vapour bubble in an inkjet printhead collapse so fast?
physics.stackexchange.com

50
Is sound a classical mechanic phenomenon or is it a quantum effect?
physics.stackexchange.com

48
Why are steel thermal mugs much better than plastic ones?
physics.stackexchange.com

47
Vacuum collapse -- why do strong metals implode but glass doesn't?
physics.stackexchange.com

47
What explanations are there for a rug steadily creeping at about a millimeter/day rate across a room?
physics.stackexchange.com

45
Could one perform a test to determine whether water was warmed by a microwave rather than over a flame?
physics.stackexchange.com

45
Isn't every theory or model wrong?
philosophy.stackexchange.com

45
How is it possible there are UV photos while our eyes cannot detect UV waves?
physics.stackexchange.com

44
Why do we use capacitors and not batteries in defibrillator?
physics.stackexchange.com

43
How do computers store sound waves just by sampling the amplitude of a wave and not the frequency?
physics.stackexchange.com

43
Why light can't escape a black hole but can escape a star with same mass?
physics.stackexchange.com

43
How did mechanical engineers work before SolidWorks?
engineering.stackexchange.com

41
How can electric fields be used to detect cracks in metals?
physics.stackexchange.com

38
What could explain the fact that during 1976-80, I used to hear commercial jets make sonic booms while flying overhead?
aviation.stackexchange.com

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