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Nov
20
comment How positively charged protons remain glued to each other while they should repel each other out of nucleus?
No. Electromagnetic force gets weaker there indeed, but strong force does even more. The upshot is that at a slightly greater distances in heavier nuclei the relative significance of electromagnetic force increases.
Nov
5
awarded  Yearling
Aug
7
awarded  Enlightened
Aug
7
awarded  Nice Answer
Jul
21
awarded  Nice Answer
Jan
22
awarded  Nice Answer
Nov
5
awarded  Yearling
Oct
1
comment Why the red-shift of distant galaxies is considered to be the effect of expanding spacetime?
Simply faster movement of galaxies billions of years ago would show up as anything between strong red shift (for galaxies that happen to move away from our galaxy) to no shift (for galaxies that happen to move transversally) to strong blue shift (for galaxies that happen to move towards our galaxy).
Aug
31
comment Difference between deltaV and specific impulse
g is Earth's gravity at the surface. It is present in the equations defining specific impulse simply to express the efficiency per weight of the fuel on Earth's surface.
Aug
31
revised Difference between deltaV and specific impulse
added 12 characters in body
Aug
31
answered Difference between deltaV and specific impulse
Aug
13
comment Do Lagrangian points actually maintain a fixed distance?
Circular orbit is not the consequence, but part of the assumptions in the derivation of the Lagrange points (see the wikipedia article you linked to in the question). The distance between the second and third body isn't negligible, but remains constant due to zero relative velocity.
Aug
13
revised Do Lagrangian points actually maintain a fixed distance?
added 212 characters in body; added 82 characters in body
Aug
13
answered Do Lagrangian points actually maintain a fixed distance?
Aug
7
answered What does $\textbf{f} = -\boldsymbol{\nabla} u$ mean in practice and how is it computed?
Aug
1
comment Using CO2 to air condition a room
You don't use temperature directly in step 1. If you mean to use it to find the heat of vaporization then it'll be the temperature of the substance you're vaporizing, i.e. liquid nitrogen. As for the mass, you use the amount of liquid nitrogen you are vaporizing. In your particular case, this is an unknown variable, so you should leave it as an unknown, continue the calculations to arrive at the formula for the final temperature in the room and ultimately, you solve for the mass of liquid nitrogen.
Jul
26
comment What's the right way to calculate the principal moment of inertia?
As always, you can use whatever units you prefer as long as you remain consistent. It is easier if you annotate/comment potential variable declarations and code and with the units you use at any stage of input, computation and output. In particular, when you compare the eigenvalues you get with what you expect the units must also be the same.
Jul
26
answered What's the right way to calculate the principal moment of inertia?
Jul
18
revised magnetic moment of proton
Made inline URLs into proper links.
Jun
20
revised What is a Lorentz boost and how to calculate it?
edited body