User Whit3rd

177 votes

Which is stronger, a rope without knots or a rope with knots?

answered Sep 6, 2016 at 6:25

42 votes

Accepted

The water analogy seems to imply that power = current. Why is this incorrect?

answered Dec 16, 2018 at 23:00

42 votes

Material which becomes less dense as pressure is applied

answered Oct 3, 2021 at 7:10

37 votes

What is a "decade" as a unit of measure (ex. a decade of the EM spectrum)?

answered Mar 15, 2018 at 22:53

15 votes

Why do ice crystals form from the top to the bottom of a bottle filled with supercooled water?

answered Jan 29, 2019 at 3:36

15 votes

Accepted

Why does hot air rise in a column instead of cold air pressing down?

answered Feb 11, 2016 at 10:22

14 votes

Why does thermal radiation only occur at infrared and visible frequencies?

answered Dec 9, 2016 at 5:04

13 votes

Why does water have no color?

answered Apr 4, 2017 at 22:21

13 votes

Why aren‘t other metals colored?

answered Feb 12 at 2:35

12 votes

Tree vs lightning rod: why does one burn and the other not?

answered Nov 16, 2017 at 12:30

10 votes

Is air less dense than chimney exhaust?

answered May 1 at 16:59

10 votes

Accepted

Is it possible that an electric field exists like $E=kx$?

answered Mar 11, 2019 at 11:44

9 votes

Tilting of Earth rotational axis

answered Nov 2, 2020 at 9:43

9 votes

Accepted

Is "The curl of the gradient of any scalar field is identically zero" contradictory to Faraday's Law?

answered Feb 15, 2017 at 6:49

7 votes

Where do gamma ray photons come from?

answered Sep 5, 2016 at 7:55

7 votes

When a submarine blows its ballast and rises, where did the energy for the ascent come from?

answered Aug 25 at 21:55

6 votes

Can a magnet rip protons from a nucleus?

answered Sep 9, 2019 at 4:10

5 votes

Does Ohm's law $V = IR$ mean voltage causes current, or does it just say that voltage and current are related?

answered Mar 8, 2019 at 11:06

5 votes

Why do people say a larger object exerts a larger gravitational pull?

answered Aug 18, 2022 at 22:59

5 votes

How do batteries lose capacity in winter?

answered May 4, 2023 at 7:59

5 votes

Why don't gas flames radiate much heat directly, but metal objects heated by them do?

answered Sep 2, 2016 at 8:48

5 votes

When is a water level no level?

answered Sep 9, 2016 at 21:00

5 votes

How can a railcar withstand high pressure but fail under a vacuum?

answered Jan 14, 2017 at 7:25

5 votes

How does Earnshaw's Theorem make passive magnetic bearings impractical?

answered May 20, 2017 at 0:13

4 votes

Accepted

How do electrons in a cathode ray remain in a straight line if they are all negatively charged?

answered Jun 8, 2017 at 21:37

4 votes

Is a mirror-less telescope possible?

answered Apr 1, 2017 at 4:53

4 votes

Why are cosine and sine functions used when representing a signal or a wave?

answered Aug 20, 2017 at 7:06

4 votes

Can the phase of a light wave be measured experimentally?

answered Jun 1, 2017 at 9:45

4 votes

Accepted

Is there such a thing as "light leveling"?

answered Oct 30, 2017 at 9:20

4 votes

Is the light from the Sun the same as the light from a bulb?

answered Mar 10, 2017 at 5:22

Stack Exchange Network

441 Answers

Which is stronger, a rope without knots or a rope with knots?

The water analogy seems to imply that power = current. Why is this incorrect?

Material which becomes less dense as pressure is applied

What is a "decade" as a unit of measure (ex. a decade of the EM spectrum)?

Why do ice crystals form from the top to the bottom of a bottle filled with supercooled water?

Why does hot air rise in a column instead of cold air pressing down?

Why does thermal radiation only occur at infrared and visible frequencies?

Why does water have no color?

Why aren‘t other metals colored?

Tree vs lightning rod: why does one burn and the other not?

Is air less dense than chimney exhaust?

Is it possible that an electric field exists like $E=kx$?

Tilting of Earth rotational axis

Is "The curl of the gradient of any scalar field is identically zero" contradictory to Faraday's Law?

Where do gamma ray photons come from?

When a submarine blows its ballast and rises, where did the energy for the ascent come from?

Can a magnet rip protons from a nucleus?

Does Ohm's law $V = IR$ mean voltage causes current, or does it just say that voltage and current are related?

Why do people say a larger object exerts a larger gravitational pull?

How do batteries lose capacity in winter?

Why don't gas flames radiate much heat directly, but metal objects heated by them do?

When is a water level no level?

How can a railcar withstand high pressure but fail under a vacuum?

How does Earnshaw's Theorem make passive magnetic bearings impractical?

How do electrons in a cathode ray remain in a straight line if they are all negatively charged?

Is a mirror-less telescope possible?

Why are cosine and sine functions used when representing a signal or a wave?

Can the phase of a light wave be measured experimentally?

Is there such a thing as "light leveling"?

Is the light from the Sun the same as the light from a bulb?