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2d
revised Would an airtight box filled with air act the same way to 1 bar of water pressure as the same box vacuum-sealed at atmospheric pressure?
tension stress also only depends on the difference
2d
comment Would an airtight box filled with air act the same way to 1 bar of water pressure as the same box vacuum-sealed at atmospheric pressure?
@JerrySchirmer: Buoyant force depends on volume of displaced fluid and density of that fluid. In one case water is being displaced, in the other case air is. Therefore the buoyant forces are different.
2d
answered Would an airtight box filled with air act the same way to 1 bar of water pressure as the same box vacuum-sealed at atmospheric pressure?
2d
comment Would an airtight box filled with air act the same way to 1 bar of water pressure as the same box vacuum-sealed at atmospheric pressure?
@JerrySchirmer: The buoyant force would definitely be different, because water is much denser than air.
Nov
28
awarded  Good Answer
Nov
28
awarded  Yearling
Nov
27
awarded  Nice Answer
Nov
27
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.
Nov
27
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
Nov
27
suggested approved edit on Has the formation of a new quark pair as we separate two quarks been observed or is it only a prediction?
Nov
26
revised Why does rotation simulate gravity if motion is relative?
added 63 characters in body
Nov
26
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).