Reputation
56,983
Next tag badge:
99/100 score
33/20 answers
Badges
8 75 200
Newest
 Nice Answer
Impact
~998k people reached

2h
awarded  Nice Answer
4h
revised Can quarks be considered real and elementary?
edited tags
5h
comment Graph of Thermistor against Temperature
Would Electrical Engineering be a better home for this question?
5h
revised Tensor product - Addition of angular momenta
edited tags
5h
revised How to find the width of a sinc function?
edited tags; edited title
6h
comment How to find the rank of the matrix $\frac{\partial ^2\mathcal{L}}{\partial \dot{X^\mu} \partial \dot{X^\nu} }$ for the Nambu-Goto string Lagrangian?
$\quad \{\chi_{\pm 1}(\sigma),\chi_{\mp 1}(\sigma^{\prime})\}_{PB} = 4 T_0^2 X^{\prime} \cdot P^{\prime}~\delta(\sigma-\sigma^{\prime})$;
7h
comment Why does a ball eventually stop?
Possible duplicates: physics.stackexchange.com/q/149409/2451 and links therein.
7h
revised Is static friction the only force causing a car to move (without sliding)?
added 4 characters in body; edited tags
7h
revised Spring pendulum system
added 6 characters in body; edited tags; edited title
7h
comment S-matrix and derivative interaction
Which lecture notes?
7h
revised Why does a ball eventually stop?
edited tags
7h
revised Dark energy and magnetic field
added 14 characters in body; edited tags
7h
revised Unified Theories
added 54 characters in body
7h
revised What do the batteries actually do to the electrons?
deleted 6 characters in body; edited tags
8h
comment How to find the rank of the matrix $\frac{\partial ^2\mathcal{L}}{\partial \dot{X^\mu} \partial \dot{X^\nu} }$ for the Nambu-Goto string Lagrangian?
New definition: $\quad \chi_0 := P\cdot X^{\prime}$; $\quad \chi_{\pm 1} := P^2 \pm T_0^2(X^{\prime})^2$; Then $\quad \{\chi_0(\sigma),\chi_{\pm 1}(\sigma^{\prime})\}_{PB} = \left[ \chi_{\pm 1}(\sigma)+\chi_{\pm 1}(\sigma^{\prime})\right] \delta^{\prime}(\sigma-\sigma^{\prime})$; $\{\chi_0(\sigma),\chi_0(\sigma^{\prime})\}_{PB} = \left[ \chi_0(\sigma)+\chi_0(\sigma^{\prime})\right] \delta^{\prime}(\sigma-\sigma^{\prime}) = \pm \frac{1}{4T_0^2}\{\chi_{\pm 1}(\sigma),\chi_{\pm 1}(\sigma^{\prime})\}_{PB} $;
9h
revised Why do some people support more electricity than others?
edited tags
10h
revised Are quantum mechanics and general relativity predictions of string theory, or were they built into the theory from the start?
edited tags
11h
reviewed Close Simple harmonic motion angular frequency
11h
reviewed Close How 3D laser scanners find coordinates
11h
reviewed Close Explain quality factor and bandwidth