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49m
comment Viability of Dysons bladeless fans?
If you have ever seen a Dyson on display, working, you will find that the fan does produce significantly less turbulent air flow. Wither that is worth the $200 price tag is up to you. But yes, it IS a highly inefficient fan.
53m
comment Maneuvering a space shuttle using propulsion systems?
It is better to describe the rocket engine pushing against the fuel it burns. Or as they say in Interstellar "Can't get anywhere without leaving something behind".
20h
comment Gravity at event horizon
There is such thing as an acceleration event horizon. en.wikipedia.org/wiki/…
Nov
20
answered How do radio waves reach receivers without being canceled out by interference?
Nov
19
comment Is it possible to create a parachute large enough to stop all velocity?
@phresnel Would you prefer I cite Schwarzschild's Metric? To show that a 4 vector at the Schwarzschild Radius would be completely rotated?
Nov
19
awarded  Editor
Nov
19
revised Is it possible to create a parachute large enough to stop all velocity?
edited body
Nov
19
comment Thermal conductivity in vacuum
"reflect all or almost all the incoming electromagnetic waves from the surrounding environment" = " made from a material that does not emit any electromagnetic waves itself inwards"
Nov
18
answered Is it possible to create a parachute large enough to stop all velocity?
Nov
18
awarded  Nice Answer
Nov
18
awarded  Yearling
Nov
17
awarded  Teacher
Nov
17
answered If your hair was on fire and you entered a vacuum, could you outlast the fire?
Nov
17
comment If your hair was on fire and you entered a vacuum, could you outlast the fire?
I assume the OP means to replace the air in the room soon after the flame is extinguished. If that is so, I am afraid your answer would be useless. In those same experiments, reintroduction of oxygen to the equation would result in the same candle reigniting. The central point isn't oxygen, its heat that drive the question's physics.
Nov
4
comment What is a rocket engine thrusting against in space?
One more thing to note. If you now consider the entire rocket as including the fuel, the centre of mass does not change. All that has happened is that the entire assemblage has stretched out.
Oct
21
comment How useful is programming in physics?
1 GB/s of Data? I don't know which detectors you worked on...but CMS produces ~40TB/s several orders of magnitude greater... Maybe you mean the data after the High Level Triggers, but that ~40TB/s doesn't get processed down to ~100MB/s on its own!
Oct
9
comment How fast is the matter and antimatter reaction compared to nuclear chain reaction?
@annav It seems like you would gain more insight from researching Protonium. One reason for the (relative) stability is that the orbiting pair needs to lose a large amount of energy before the two come into the range of the strong nuclear force.
Sep
15
comment How does an electron move around in an orbital? Is it “wave-like” or random?
Confusingly enough, you can however take a picture of the little ball in there, with a definite position. Even though there is not little ball moving around... However, when you do that, the little ball is no longer "in" the orbital.
Sep
12
comment Quantum mechanics threshold
@BMS Can't help but notice that the answers in the question you linked to does not include Neutron stars, which are quite big.
Sep
11
comment Is this scene from the A Team explainable by Physics?
-1 Order of magnitude issue with muzzle velocity. Also, why complicate a simple delta-v calculation with all these numbers. Just apply the rocket equation.