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visits member for 1 year, 9 months
seen Dec 12 '13 at 22:05

ψ


Sep
4
comment In general relativity, are light-like curves light-like geodesics?
I believe it should be $y(\lambda) = R\sin(\alpha\lambda)$.
Jul
8
revised Definition of Kinetic energy
Cleaned up the notation a bit and tweaked the wording in one place.
Jul
2
revised Definition of Kinetic energy
Added a linear motion example to the rotational motion example already given.
Jul
1
answered Definition of Kinetic energy
Jul
1
comment Definition of Kinetic energy
Could you say more about the context? For example, are the v's supposed to be linear velocities, or would an example with angular velocities fit with what you are asking? How about curvilinear coordinates?
Jun
18
revised Is there any other mathematical tool to measure velocity, instead useing derivative?
Upon reflection I have decided the originally claimed connection between defining locally and calculus is obscure at best.
Jun
16
answered Is there any other mathematical tool to measure velocity, instead useing derivative?
Jun
12
awarded  Fanatic
Jun
8
revised Static as opposed to Kinetic Friction in Rolling Motion
Added some more on how kinetic friction goes with rubbing, changed tank treads to tank tracks, and replaced one link with two different links.
Jun
6
revised Static as opposed to Kinetic Friction in Rolling Motion
Fixed up the wording a bit more.
Jun
5
revised Static as opposed to Kinetic Friction in Rolling Motion
Fixed up the wording a bit.
Jun
5
answered Static as opposed to Kinetic Friction in Rolling Motion
May
7
awarded  Citizen Patrol
Apr
28
revised Integrating factor $1/T$ in 2nd Law of Thermodynamics
Fixed a typo in the last of the display equations.
Apr
28
suggested suggested edit on Integrating factor $1/T$ in 2nd Law of Thermodynamics
Apr
24
awarded  Informed
Apr
12
comment what's the physical significance of the off-diagonal element in the matrix of moment of inertia
I believe $\frac{\omega}{2}$ should be $\frac{1}{2} \omega^2$.
Feb
12
comment Why quantum mechanics?
I believe $| \langle a |\psi \rangle |^2$ should be $| \langle a |\psi \rangle |^2 da$.
Dec
25
awarded  Enthusiast
Oct
30
revised Why might the normal force on a box not be equal to its weight?
added 48 characters in body