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1d
comment Can Hooke's law go along with Newton's 3rd law & how is momentum conserved in case of spring?
Momentum is conserved even if you are standing on regular floor, but the floor now has to be included in the system as well.
1d
revised Has the formation of a new quark pair as we separate two quarks been observed or is it only a prediction?
fix grammar a bit
1d
suggested suggested edit on Has the formation of a new quark pair as we separate two quarks been observed or is it only a prediction?
2d
revised Why does rotation simulate gravity if motion is relative?
added 63 characters in body
2d
answered Why does rotation simulate gravity if motion is relative?
Nov
25
answered Why does the Sun always rise in the East?
Nov
25
comment Why does the Sun always rise in the East?
I suspect the image is more confusing then helping, actually.
Nov
8
comment How to know if a vehicle is moving without any external source of information?
Do you know some initial condition? That is do you know the vehicle was stationary when you boarded it and can you keep some (purely internal) sensor active since then?
Nov
8
comment Dying question: Tractor wheels — large vs small
You should still add why the driven wheels are large to make it complete answer.
Nov
8
comment How to know if a vehicle is moving without any external source of information?
@Rohinb97: That's big and complicated and lags a lot and wont' be that precise. A mass attached with pressure-sensitive elements is all you need and it can be made pretty small, cheap and quite accurate (every mobile phone has accelerometer these days).
Nov
4
revised The sound of rotating helicopter blades
mention Doppler effect
Nov
4
comment The sound of rotating helicopter blades
@Dariusz: Yes, the sound will definitely vary by listener position and yes, the Doppler effect does play a role; the blade tips move at significant fraction of speed of sound.
Nov
3
comment Kepler's First Law of Planetary Motion: Whats at the other focus?
Of course there are no two foci in reality. Reality does not care that we consider some points special and call them foci. But there always are two points we would call foci (unless the orbit is perfectly circular in which case there is just a centre).
Nov
3
comment Kepler's First Law of Planetary Motion: Whats at the other focus?
The video does not explain anything. It just shows how ellipse is defined and how to construct it on paper.
Nov
1
comment energy, gravity and buoyancy working together
@JoeArroyo: Video is really poor method of describing problem like this. There is nothing that would really have to be shown as video. At least please transcribe the text description here. And if you have the original image (clearly you uploaded the video, but I don't know whether you made it too) try to include it.
Nov
1
revised energy, gravity and buoyancy working together
add image marking the inconsistency between the elevated and central water level as that is more important than the first marked problem
Nov
1
comment The sound of rotating helicopter blades
@Michael: The speed of the blade is fairly constant relative to the helicopter. But when the helicopter flies forward, the blade's speed relative to air is significantly higher on the advancing side.