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This is the Twin frog paradox. I have two questions. First, what does it mean by there is no rigid body in...
2Physics Asked on 2 years ago
If we place an object such as a coin in front of the light source ,e.g a candle we cant see the candle through the coin but if the size...
1Physics Asked on 2 years ago
I was hoping someone could explain each term in Weizsäcker's semi-empirical mass formula in simple English because I don't understand it. Any help will be appreciated thank...
0Physics Asked on 2 years ago
My physics book (The Fundamentals of Physics) while explaining vector-ness of angular quantity (formally "Are Angular Quantities Vectors?") states that angular velocity and angular acceleration are vectors....
6Physics Asked on 2 years ago
I'm learning Peskin's qft now and I'm a little confused about problem 2.2 . Suppose I write the field $phi(x)$ as: $phi(x) =int frac{d^3p}{(2pi)^3}frac{1}{sqrt{2E_{p}}} (a_{p}e^{-ipx}+b_{p}e^{ipx})$ I know...
2Physics Asked on 2 years ago
I have calculated time taken to travel a fixed distance by the object from two different frames of refrence. One frame was moving with uniform velocity wrt other ....
2Physics Asked on 2 years ago
I got some interest in String Theory when I was listening to lectures of David Tong and Brian Greene. I remember them stating that the spacetime manifold is compactified to...
1Physics Asked on 2 years ago
What exactly is tension force and how does it act? When I saw a video on Khan Academy it said that tension force is just a force...
2Physics Asked on 2 years ago
I have a DB with 180 tables, and I was doing a logical deletion, now I need to do some testing with physical deletion. Is there a way to alter...
1Database Administrators Asked by user73639 on 2 years ago
I need to write a trigger which prevents certain users from logging into the production database. We use Active Data Guard. If I hardcode the Linux hostname in the trigger...
1Database Administrators Asked on 2 years ago
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