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d_b
  • Member for 8 years, 7 months
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68 votes

Why is there a need for the concept of energy if we have the concept of momentum?

33 votes
Accepted

Why does the vacuum even have permeability and permittivity?

22 votes

Idea of Covering Group

20 votes

Why is the centre of mass of a semicircular wire outside the body?

15 votes

What is the physical importance of topological quantum field theory?

14 votes

Properties of the dot product

14 votes

Is this four-step recipe for quantization always valid?

14 votes

Is the second law of thermodynamics even a law?

14 votes

Why is quantum gravity non-renormalizable?

12 votes

Why does charge accumulate at points?

11 votes
Accepted

When assembling a ball of charge, why do we need less energy to assemble a bigger ball?

10 votes
Accepted

Proof that Vectors Describe Reality Correctly

10 votes
Accepted

How can (in Dirac's terminology) the product of two "real" linear operators be "not real"?

10 votes

Is the spacetime interval a tensor?

9 votes

How does potential energy increase with no work?

8 votes

Should it be 1.5K instead of 1.5°C?

7 votes
Accepted

Basics of photoelectric effect

7 votes
Accepted

How entangled are the $|W\rangle$ and the $|GHZ\rangle$ states?

6 votes
Accepted

What did Feynman say about cesium chloride and body-centered cubic structure?

6 votes
Accepted

Is a bra-ket always a scalar?

5 votes

Why bulk states in quantum hall effect do not contribute to electric conductivity

5 votes

regarding the infinite cross section in Rutherford scattering

5 votes

Is Maxwell's field the wave function of the photon?

5 votes
Accepted

Does the mechanical energy of a system depend on the condition of the inertial frame?

5 votes

Simple question about gravity

5 votes

Spontaneous discrete symmetry breaking always implies domain walls

5 votes

Why underscoring a letter like $\underline{F} $ for force, $\underline{\nabla} $ for the differential operator, etc, in Classical Mechanics?

4 votes

College Board Problem: Conservation of Momentum -> Conservation of Energy in a Spring

4 votes

Why isn't time dilation invalid for small values of the lenght of the clock?

4 votes
Accepted

Are anomalies always undesirable?

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