User hobbs

45 votes

Accepted

If the moon had a mirror surface, would the earth be equally illuminated as by the sun during full moon, or would it require a different mirror shape?

answered Feb 15, 2017 at 21:35

29 votes

Accepted

Is there any truth to interpreting definition of a second as corresponding to oscillations?

atomic-physics frequency definition si-units metrology

answered May 17, 2016 at 4:56

22 votes

Accepted

Why does canola oil heat up in the microwave?

thermodynamics thermal-radiation microwaves

answered Jul 3, 2021 at 16:19

21 votes

How do laser "tape measures" work?

laser measurements instrument

answered May 15, 2016 at 7:29

10 votes

If I toss a coin, vertically, on the surface of Mars, will it land back in my hand?

newtonian-mechanics newtonian-gravity rotational-dynamics projectile coriolis-effect

answered Dec 31, 2015 at 21:14

8 votes

Accepted

What is the speed of the fastest moving body in our solar system?

solar-system speed asteroids comets

answered Nov 7, 2014 at 5:45

8 votes

Do bubbles get created when you move something in water?

fluid-dynamics bubbles

answered Oct 2, 2020 at 17:23

7 votes

Why are leap seconds needed so often?

astronomy time metrology

answered Apr 23, 2018 at 7:48

4 votes

Do we have relativistic mass even when resting on Earth?

general-relativity special-relativity mass reference-frames inertial-frames

answered Aug 14, 2016 at 5:20

4 votes

Accepted

How measurements for defining a second were made?

time atomic-physics history si-units metrology

answered Feb 27, 2017 at 21:49

4 votes

In reverse time, do objects at rest fall upwards?

thermodynamics classical-mechanics newtonian-gravity time-reversal-symmetry arrow-of-time

answered Dec 19, 2014 at 7:20

4 votes

Spinning magnet in space and EM waves but how?

electromagnetism

answered Oct 12, 2021 at 15:10

3 votes

Far-field in air versus vacuum

electromagnetic-radiation approximations antennas

answered Oct 12, 2021 at 6:31

3 votes

Block universe theory

general-relativity cosmology time spacetime-dimensions

answered Nov 12, 2020 at 16:59

3 votes

What was the frequency of the gravitational wave recently detected, and why?

gravity black-holes gravitational-waves

answered Feb 12, 2016 at 20:46

2 votes

Why Voltage Drop is not Influenced by Resistor Value?

electric-current electrical-resistance voltage

answered Jan 5, 2015 at 20:50

2 votes

Radio wavelength to penetrate 8 ft of seawater

radio radio-frequency

answered Jun 25, 2019 at 9:02

2 votes

Intuitively, what actually is the cause of resonance?

oscillators resonance vibrations

answered Jan 28, 2021 at 23:43

2 votes

Accepted

Can we light a light bulb with earth's electric field?

electric-fields electric-current potential

answered Aug 5 at 15:01

2 votes

Speed of electrons in a current-carrying metallic wire: does it even make sense?

electrons solid-state-physics electric-current conductors speed

answered Feb 23, 2018 at 3:44

1 vote

Suppose there is a 50 watt infrared bulb and a 50 watt UV bulb. Do they emit light of the same energy?

electromagnetic-radiation energy-conservation

answered Dec 8, 2020 at 23:31

1 vote

Accepted

Is surveilluminescence an April fool's joke or is the science legitimate?

visible-light field-theory sensor

answered Sep 5, 2017 at 19:52

1 vote

How to interpret the units of the dot or cross product of two vectors?

vectors units geometry mathematics dimensional-analysis

answered Mar 28, 2016 at 4:36

1 vote

Does a black hole have any kind of mass?

general-relativity gravity black-holes mass escape-velocity

answered Nov 7, 2014 at 5:12

0 votes

What does it mean to have two phase coherent signals at different frequencies?

signal-processing

answered Nov 7, 2014 at 6:21

0 votes

Do all black holes spin in the same direction?

cosmology black-holes angular-momentum

answered Nov 13, 2014 at 5:17

0 votes

What is a medium?

electromagnetism speed-of-light aether

answered Oct 22, 2019 at 20:10

0 votes

What's the actual path of the planets?

orbital-motion inertial-frames planets solar-system celestial-mechanics

answered Jul 2, 2020 at 5:51

0 votes

How high can aerodynamic drag be during rocket landings?

rocket-science

answered May 9, 2021 at 0:38

0 votes

Does rain jam radio signal?

waves radio-frequency

answered Jun 8, 2021 at 18:21

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30 Answers

If the moon had a mirror surface, would the earth be equally illuminated as by the sun during full moon, or would it require a different mirror shape?

Is there any truth to interpreting definition of a second as corresponding to oscillations?

Why does canola oil heat up in the microwave?

How do laser "tape measures" work?

If I toss a coin, vertically, on the surface of Mars, will it land back in my hand?

What is the speed of the fastest moving body in our solar system?

Do bubbles get created when you move something in water?

Why are leap seconds needed so often?

Do we have relativistic mass even when resting on Earth?

How measurements for defining a second were made?

In reverse time, do objects at rest fall upwards?

Spinning magnet in space and EM waves but how?

Far-field in air versus vacuum

Block universe theory

What was the frequency of the gravitational wave recently detected, and why?

Why Voltage Drop is not Influenced by Resistor Value?

Radio wavelength to penetrate 8 ft of seawater

Intuitively, what actually is the cause of resonance?

Can we light a light bulb with earth's electric field?

Speed of electrons in a current-carrying metallic wire: does it even make sense?

Suppose there is a 50 watt infrared bulb and a 50 watt UV bulb. Do they emit light of the same energy?

Is surveilluminescence an April fool's joke or is the science legitimate?

How to interpret the units of the dot or cross product of two vectors?

Does a black hole have any kind of mass?

What does it mean to have two phase coherent signals at different frequencies?

Do all black holes spin in the same direction?

What is a medium?

What's the actual path of the planets?

How high can aerodynamic drag be during rocket landings?

Does rain jam radio signal?