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md2perpe
  • Member for 5 years, 3 months
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17 votes

Will a beam of protons and a beam of electrons attract or repel each other?

16 votes

What is the definition of unit vector?

13 votes

A light clock with a retroreflector instead of a mirror

11 votes

Why are the dimensions of escape velocity correct?

9 votes

Is this a Dirac delta function in disguise?

6 votes
Accepted

Is the current density not uniquely defined?

6 votes

Why does rainwater form moving waves on the ground? Is there a name for this effect?

5 votes

Hypothetical: Can I determinate if my room is moving by measuring the time it takes for a photon to reach the oposite wall?

5 votes
Accepted

How is the wave function Lebesgue integrable?

4 votes

How does a resistor "know" to increase the potential difference across its ends?

4 votes

What causes $A^{\mu\nu}_{\pm}=F^{\mu\nu}\pm i \tilde{F}^{\mu\nu}$ to have three independent components rather than six?

4 votes

Magnus effect without windspeed

3 votes

Relative velocity greater than speed of light

3 votes

If force is a vector, then why is pressure a scalar?

3 votes
Accepted

Spring-Mass-Pendulum "via Newton's Laws"

3 votes

If a torque stops a wheel from spinning, will the wheel continue to move forward without spinning?

3 votes

What does $ \mu \nabla^{2} \vec V$ mean in the Navier-Stokes equations?

3 votes

How can we argue $\nabla\cdot v = 0$ when ${\mathscr r} \ne 0$ on this vector function?

3 votes

Special relativity thought experiment

2 votes

What is intuitively the Hodge dual of a $p$-form?

2 votes

Simultaneity (working backwards) and absolute time

2 votes

General Relativity: is there a better way to get spherical coordinates?

2 votes

Notation for covariant derivative in the book Gravitation

2 votes

Equation for effects of the density on time dilation

2 votes

What do I need to build special relativity?

2 votes

What is the correct frame of reference for determining the magnetic force on a charge?

2 votes

Relativistic change of mass and De-broglie's equation

2 votes

Why do we assume that Earth and infinity are at same potential?

1 vote

Does potential energy increase inertial mass of system?

1 vote

Doubts on covariant and contravariant vectors and on double tensors