Apparently, this user prefers to keep an air of mystery about them.
6 Can one make a ball rotate around a vertical axis using only a combination of horizontal axis rotations? Jul 24 '12
2 How does the period of a temperature fluctuation affect the depth to which the ground freezes? Aug 25 '11
2 Transmission and reflection Oct 25 '11
1 Finding the electric field for a shell of charge Dec 12 '12