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Apr
12
answered Why do we set $x^0 = ct$ instead of $x^0 = t$?
Apr
12
comment If the MH370 black box did sink to 15000 ft, how long would it have taken?
Is it posible to estimate the constants?
Apr
10
comment Why are the true variance of these orbits out by ~pi?
@Kvothe: functions in Python always require parentheses. This means that it can only be interpreted as (sin(a))**b.
Apr
6
answered Gauss' Law for Magnetism Derivative Form: With or without volume integral?
Apr
1
comment Do we need waves for fields?
@Primeczar: I don't know why you say the source charge must do work. It's the one carrying the test charge from infinity who does the work. If the source charge did work equal to that, then there would be no change in energy for the test charge.
Apr
1
answered Do we need waves for fields?
Mar
31
comment Relativity's effects on centripetal motion
That's a good point, but then you need to take into account that $F$ is a vector, not a scalar. Otherwise $dv/dt$ would be zero too.
Mar
31
comment Relativity's effects on centripetal motion
$\gamma$ is a function of velocity, so your derivative is missing a term.
Mar
29
comment Does total angular momentum of the Earth-Moon system include individual rotational angular momenta?
The parallel axis theorem lets you calculate the rotational angular momentum around each body's center and then translate it to the center of mass of the system. You still have to take into account that the axes aren't perpendicular the orbits; you'll probably need to assume the moment of inertia is a tensor for this.
Mar
11
comment Why would spacetime curvature cause gravity?
@GreenAsJade: The four-velocity is commonly defined as $u^i = \frac{dx^i}{d\tau}$. Written as a four vector, it looks like $\vec{u} = \gamma (c, \mathbf{v})$, with $\gamma = (1-v^2/c^2)^{-1/2}$. Its length squared is then $\gamma^2 (c^2-v^2)$, which is equal to $c^2$.
Mar
9
answered Convert constant of gravitation to days and AUs
Mar
7
answered Relative Velocities and Conservation of Kinetic Energy
Mar
5
comment When to use Cosine or Sine?
+1 for "do not memorize". I feel like I tell students this far too often.
Feb
28
answered $\cos^{2}(\phi)$ in the kinetic energy term of the Lagrangian is one?
Feb
28
comment $\cos^{2}(\phi)$ in the kinetic energy term of the Lagrangian is one?
That's a pretty big PDF. You should probably copy the problem text into the actual question so we can get some context.
Feb
26
comment What is wave particle duality?
possible duplicate of Is the wave-particle duality a real duality?
Feb
26
comment What is wave particle duality?
Come on, there is a whole tag for this question: physics.stackexchange.com/questions/tagged/…
Feb
26
comment What are functions of a complex variable used for in physics?
I know all those properties. This doesn't answer the question.
Feb
26
accepted What are functions of a complex variable used for in physics?
Feb
26
awarded  Nice Question