Bart Arondson

80 reputation

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visits	member for	7 months
	seen	May 5 at 20:11
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	80 reputation	bio	website		visits	member for	7 months
6 badges		location			seen	May 5 at 20:11

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Apr 23	comment	In terms of the Doppler effect, what happens when the source is moving faster than the wave? From the supersonic image it seems that an observer standing just below the line of motion would first hear the most recent sound waves and after that the less recent waves. Does that mean he would hear the sound in reverse?
Apr 12	comment	Effective angle of attack of a wing In my question I assume a yaw angle of 0. My point is that when you have a wing with dihedral and you pitch it up, the angle of attack on the wing is different than it would be without dihedral.
Apr 12	accepted	Effective angle of attack of a wing
Apr 12	answered	Effective angle of attack of a wing
Mar 27	comment	Metronome synchronisation applied to swings @annav Thanks for the links, but these motions are not really coupled in the same way as the metronomes are. Is that a big difference?
Mar 26	asked	Metronome synchronisation applied to swings
Mar 9	revised	Effective angle of attack of a wing added images to show how I see this problem
Mar 8	accepted	Force in tetrahedron edges
Feb 28	asked	Effective angle of attack of a wing
Feb 28	awarded	Citizen Patrol
Feb 20	awarded	Scholar
Feb 20	accepted	Necessary air pressure in flexible vessel to lift a certain mass
Nov 6	comment	Force in tetrahedron edges I've added a calculation for the force in the three lower beams.
Nov 6	awarded	Editor
Nov 6	revised	Force in tetrahedron edges Added clarification following an answer
Nov 5	asked	Force in tetrahedron edges
Oct 21	comment	Necessary air pressure in flexible vessel to lift a certain mass This answer is only partially right. @FrankH makes a valid point by involving the surface tension in this. That, the shear stress in the wall of the bag and the boiler equations are somehow involved, I think...
Oct 15	awarded	Promoter
Oct 12	awarded	Supporter
Oct 12	comment	Necessary air pressure in flexible vessel to lift a certain mass OK, thanks for the answer. I'm still curious about the part with the bag size. Would you know an analytic relation between bag volume and pressure? Say I have a bag with 10L volume, how much air should I put in it to achieve the necessary pressure?