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Jan
19
awarded  Critic
May
19
comment Does a well-lit mirror weigh more than an unlit mirror?
Yes. In fact, this is how solar sails work.
Dec
16
comment If an airplane is flying sideways, is it in free fall?
Your question is not precise enough yet. Are the wings still horizontal (i.e. around which axis do you turn 90°)? Sustained sideways flying with horizontal wings is not possible. With vertical wings some planes have enough power to use the rudder to generate enough lift for sustained flight.
Dec
16
comment If an airplane is flying sideways, is it in free fall?
The g-force for turning is not exponential, it is 1/cos(alpha), alpha being the bank angle. You are describing a normal flight regime, whereas the OP seems to talk about flying sideways.
Oct
21
comment Where does the energy from a parachute go?
You win again, entropy!
Dec
10
awarded  Supporter
May
7
comment Why is exhaling more forceful than inhaling?
According to [this](sensorwiki.org/doku.php/sensors/air_pressure) the maximal pressure difference under standard conditions is not much more than 3.3 psi or around .23 bar. You may get higher pressures using the closed mouth cavity but as far as the lungs go, that seems to be it...
May
7
comment Why is exhaling more forceful than inhaling?
I am not sure if you can inflate at several atmospheres. A ballon does not need so much for inflation anyway - you just have the impression that your head is gonna blow away at some 1/10 atmospheres already. Perhaps some savvy anesthetist can come forward to clarify!
May
7
comment Why is exhaling more forceful than inhaling?
@MarkDominus there are different kinds of breathing, but diaphragmatic is one of them, and I have a feeling the diaphragm is always taking part - but I´ll be happy to correct if anyone has knowledge on this one.
May
7
awarded  Teacher
May
7
answered Why is exhaling more forceful than inhaling?