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Suppose I have two operators $hat{A}$ and $hat{B}$, where $hat{A}=hat{a_1}+hat{a_2}+...+hat{a_m}$, and $hat{B}=hat{b_1}+hat{b_2}+...+hat{b_n}$. Is there a necessary and sufficient condition for $hat{a_1},hat{a_2},...hat{a_m}$ and $hat{b_1},hat{b_2},...hat{b_n}$...
Asked on 12/30/2020
1 answerWhen I drive a car at high speed and when I am near to another big car (like a van, or transport vehicle) I feel an attraction to or something...
Asked on 12/30/2020 by Murshid Badawi
5 answerIt's often mentioned that all (?) basic physical laws are time reversible. For example if I imagine a planet sized perfect metal ball, and then a smaller ball falls onto...
Asked on 12/30/2020 by FlyingWaffle
2 answerI was just wondering ..... In this Image of an ion thruster, when the positively charged particles pass through the grids,...
Asked on 12/30/2020 by Chandrahas
1 answerI am reading a book called "Structure and Interpretation of Classical Mechanics"by MIT Press.While discussing configuration space and degrees of freedom,the authors remark the following:Strictly speaking, the dimension of...
Asked on 12/30/2020 by Sandesh Kalantre
1 answerI was taught that light tends to take the 'fastest' route. However, this made me wonder about the following scenario: Suppose the start and end point (source and observer) are...
Asked on 12/30/2020 by Dennis Jaheruddin
2 answerStress is like pressure and it doesn't matter in which direction the force acts (given it is perpendicular to the surface). I read in my book that if we...
Asked on 12/30/2020
6 answerSay we have a Hilbert space of $2N$ Majoranas. Typically we pair the Majoranas $a_{2j},a_{2j+1}$ into complex fermion creation /annihilation operators$$c_j = (a_{2j}+ i a_{2j+1})/sqrt{2},quad c_j^dagger...
Asked on 12/30/2020
0 answerI'm holding two very massive, dense objects, one in each hand at arms length. I fall through the event horizon of a very large black hole. The tidal forces at...
Asked on 12/30/2020 by tobuslieven
2 answerSo I am having some difficulty understanding gyroscopic precession. I understand that mathematically by convention torque is perpendicular to the force and so is angular momentum but surely that force...
Asked on 12/30/2020 by The homeschooler
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