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2d
comment Effect of initial suction power on siphon performance
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2d
comment Can the absence of information provide which-way knowledge?
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2d
comment Would you save energy by heating the air in a shower stall so that you could use colder water?
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Jan
28
comment What happens to wheels of a car moving near speed of light?
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Jan
16
comment two object connected by a spring : momentum/energy topic
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Jan
11
comment Does matter shrink uniformly without restriction in freefall to central region of black hole?
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Jan
11
comment Newton's Second Law of Motion
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Jan
11
comment Stripped twin paradox
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Jan
7
comment Stripped twin paradox
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Nov
24
comment Mechanical wave speed and transverse wave velocity
@Sathyam That's been going on for a while, actually, and they get closed -- flag them as you see them, leave a nice comment asking for more effort, and move on.
Nov
24
comment Mechanical wave speed and transverse wave velocity
@Sathyam please be nice.
Nov
13
comment Why is $\pi$ the value it is?
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Nov
8
comment “Warp-drive” thought experiment
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Oct
30
comment Gravitational Force
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Oct
27
comment Why doesn't the solar wind disrupt the planets?
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Oct
17
comment Prove that the spacetime interval is not invariant under Galilean transformations
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Sep
29
comment Muon demonstration of time dilation
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Sep
20
comment What does Potential Difference between a load/resistor mean?
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Sep
19
comment Communication back in time?
A paper (one amongst many) in Phys. Rev. D. sounds pretty mainstream to me. Conjecturing various CTCs and later proving them impossible is certainly something that qualifies as research worthy.
Sep
19
comment Communication back in time?
@JohnDuffield Mainstream research. Tipler cylinders and co are mainstream, commenting "time machines are science fiction" on an answer that talks of mainstream physics is not constructive at all. Crowell's answer has nothing to do with your point. CTCs are world lines (well, in the general usage of the term), so yes, objects will have a time evolution along them.