User Bill N

36 votes

Accepted

How is it possible that it can get hotter in the car than it is outside?

answered Jul 20, 2015 at 2:07

29 votes

Accepted

How can wifi penetrate through walls when visible light can't?

visible-light electromagnetic-radiation material-science microwaves radio-frequency

answered Dec 23, 2016 at 20:49

25 votes

Why does the Earth follow an elliptical trajectory rather than a parabolic one?

newtonian-mechanics newtonian-gravity orbital-motion projectile celestial-mechanics

answered May 9, 2019 at 21:48

25 votes

Why does the sun make me feel warm?

energy kinematics photons

answered Aug 27, 2015 at 3:30

22 votes

Accepted

Platinum seems to have higher kinetic friction coef. than static - how is this possible?

friction metals

answered Nov 10, 2021 at 13:51

20 votes

Can radioactivity be slowed through time dilation?

special-relativity reference-frames time-dilation radioactivity half-life

answered Feb 24, 2016 at 15:37

18 votes

Do all equations have identical units on the left- and right-hand sides?

units dimensional-analysis si-units

answered Apr 24, 2016 at 14:50

16 votes

Accepted

4-momentum of photon

special-relativity photons

answered May 26, 2015 at 3:37

15 votes

Does the total kinetic energy change during an elastic collision?

newtonian-mechanics energy momentum conservation-laws collision

answered Dec 14, 2018 at 15:10

11 votes

Accepted

Why doesn't Beta Decay violate the laws of physics?

energy-conservation mass-energy neutrons

answered May 23, 2015 at 0:54

11 votes

How does a resistor "know" to increase the potential difference across its ends?

electric-circuits electricity electric-current electrical-resistance voltage

answered Jan 3 at 21:39

10 votes

What exactly is electrical current, voltage, and resistance?

electric-circuits electric-current electrical-resistance voltage

answered Apr 23, 2019 at 20:48

10 votes

Accepted

What is tension force?

newtonian-mechanics forces string

answered Jul 24, 2020 at 4:37

10 votes

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Forced Oscillation Explained with Violin String

harmonic-oscillator oscillators resonance vibrations coupled-oscillators

answered Jan 31, 2021 at 16:13

10 votes

Accepted

Why does lightning generate multiple branches?

electricity lightning

answered May 21, 2015 at 2:34

10 votes

Why do lightning rods have a sharp point at the top?

electricity everyday-life atmospheric-science lightning

answered May 16, 2015 at 16:24

10 votes

Accepted

How does wax fuel a flame?

everyday-life physical-chemistry combustion

answered Nov 10, 2015 at 22:44

9 votes

Why does time exist?

time universe speed

answered May 25, 2015 at 15:12

8 votes

Accepted

How does protium-protium fusion work?

energy-conservation nuclear-physics hydrogen fusion protons

answered Mar 4, 2021 at 13:50

8 votes

Do all frequencies of light have the same speed?

electromagnetic-radiation speed-of-light frequency wavelength

answered Feb 20, 2015 at 18:10

7 votes

How do I experimentally measure the surface area of a rock?

measurements

answered Nov 9, 2019 at 15:29

7 votes

How much current will go through my body if I were to put my finger in an outlet?

electricity electric-current electrical-resistance voltage biology

answered May 28, 2020 at 16:37

7 votes

Why is the number of isotopes of an element bounded?

nuclear-physics stability binding-energy elements isotopes

answered May 28, 2021 at 15:38

7 votes

How to convert the electron volt into Velocity unit?

homework-and-exercises electrons velocity units dimensional-analysis

answered Dec 22, 2017 at 23:10

7 votes

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How can we know the state of a quantum system?

quantum-mechanics measurement-problem

answered May 2, 2016 at 3:02

6 votes

What do "tangential and centripetal acceleration" mean for non-circular motion?

newtonian-mechanics classical-mechanics rotational-dynamics free-fall

answered Jan 26, 2021 at 15:15

6 votes

Can ionizing radiation cause a proton to be removed from an atom?

ionization-energy

answered Dec 5, 2020 at 15:41

6 votes

What is the difference between electric potential, potential difference, and voltage?

potential voltage definition

answered Dec 25, 2016 at 18:44

6 votes

How to prove the constant speed of light using Lorentz transform?

special-relativity speed-of-light inertial-frames lorentz-symmetry

answered May 23, 2017 at 11:41

6 votes

Accepted

Acceleration Due To Gravity When Finding The Weight Of An Object

newtonian-mechanics forces newtonian-gravity weight

answered Jul 31, 2017 at 17:50

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661 Answers

How is it possible that it can get hotter in the car than it is outside?

How can wifi penetrate through walls when visible light can't?

Why does the Earth follow an elliptical trajectory rather than a parabolic one?

Why does the sun make me feel warm?

Platinum seems to have higher kinetic friction coef. than static - how is this possible?

Can radioactivity be slowed through time dilation?

Do all equations have identical units on the left- and right-hand sides?

4-momentum of photon

Does the total kinetic energy change during an elastic collision?

Why doesn't Beta Decay violate the laws of physics?

How does a resistor "know" to increase the potential difference across its ends?

What exactly is electrical current, voltage, and resistance?

What is tension force?

Forced Oscillation Explained with Violin String

Why does lightning generate multiple branches?

Why do lightning rods have a sharp point at the top?

How does wax fuel a flame?

Why does time exist?

How does protium-protium fusion work?

Do all frequencies of light have the same speed?

How do I experimentally measure the surface area of a rock?

How much current will go through my body if I were to put my finger in an outlet?

Why is the number of isotopes of an element bounded?

How to convert the electron volt into Velocity unit?

How can we know the state of a quantum system?

What do "tangential and centripetal acceleration" mean for non-circular motion?

Can ionizing radiation cause a proton to be removed from an atom?

What is the difference between electric potential, potential difference, and voltage?

How to prove the constant speed of light using Lorentz transform?

Acceleration Due To Gravity When Finding The Weight Of An Object