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HNQ
5:33 AM
3
Q: What shape the Earth would have to be for an object in free fall to follow a straight line trajectory?

marconiI was explaining to my 8 year old daughter that objects in free fall follow an elliptical trajectory instead of the commonly believed parabolic one (source: https://www.forbes.com/sites/startswithabang/2020/03/12/we-all-learned-physics-biggest-myth-that-projectiles-make-a-parabola/). I told her t...

 
 
2 hours later…
HNQ
7:37 AM
4
Q: Chirality/helicity of anti-particles (again)

GaloisFanQuestions (very) closely related to this one have been posted dozens of times, but the joint information (including even lecture notes and books) is incredibly contradictory, so I state my specific doubt again. Take for instance the line of thought that ends with the conclusion that the decay $\p...

 
 
5 hours later…
HNQ
1:01 PM
1
Q: About "Free electron theory in metals" in Condensed Matter Physics

SAGAR MODAKWe study "Free electron theory in metals" in Condensed Matter Physics. While discussing this theory (both classically and quantum mechanically), we assume the electrons moving inside the metal to be a "free electron gas". But in Condensed Matter Physics, we mainly discuss about the "condensed" ph...

 
 
2 hours later…
HNQ
3:31 PM
1
Q: Why do all fighter jets and aerobatic airplanes have flat wings?

Markoul11According to Bernoulli's principle and for a given angle of attack would that not lower the lift force of the airplane and increase its drag and therefore increasing its demand in thrust and fuel consumption? This is anti-economic and puts the airplane under unnecessary mechanical stress. I am no...

 
 
7 hours later…
HNQ
10:35 PM
3
Q: Visualizing Tensors in the simplest possible way

Terrific LaggerIs there any easy way to visualize tensors (such as stress) using paper and pencil with the help of a matrix? If it is possible, kindly post a picture of that tensor.

 

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