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Started programming on a ZX spectrum in the 80's and have moved through Assembly, Turbo Pascal, C++, C#, Fortran. My main area of focus is engineering and scientific computing like numerical methods and 3D graphics.


Jul
22
comment Trajectory of rolling billiard ball after collision with another billiard ball with same mass
\begin{pmatrix} x & y & z \end{pmatrix} => $\begin{pmatrix} x & y & z \end{pmatrix}$ See physics.stackexchange.com/help/notation
Jul
22
comment Is there a general rule for determining the direction of tension force?
Tension does not have a single direction. It is either tensile or compressive.
Jul
21
answered A lever arm-definition question
Jul
20
comment Observations of erratic rotation of asteroids
Actually no, any body would rotate about its center of mass in a predictable way in the absence of external forces.
Jul
20
answered rotational springs
Jul
20
comment rotational springs
A rotational spring still applies a linear force over distance (on the ends of the spring) to store/release work.
Jul
17
comment Applying impulse to velocity
Yes, $j$ is a scalar impulse value and $\bf n$ is a vector normal direction. Together they create a momentum exchange vector.
Jul
17
comment About the rotating speed of a light beam which has been reflected off a rotating mirror
What is "rotating speed of light"? Light is not a rigid object to have rotations associated with it.
Jul
16
revised Can anyone explain the unit for rate of expansion of universe?
edited tags
Jul
15
answered Tension in a rope
Jul
15
comment Tension in a rope
What is the total weight of the rope (or the linear weight)?
Jul
15
comment What is the difference between unit and dimensions?
I was starting simple here.
Jul
15
revised What is the difference between unit and dimensions?
added 13 characters in body
Jul
15
answered What is the difference between unit and dimensions?
Jul
14
comment Why do Runge Kutta's method and Euler's are so different?
For the same time step the two methods have vastly different accuracy and stability. Alas, this is mostly a mathematics question, and it would be better if you explain you level of understanding on Numerical Methods.
Jul
13
comment Why do power lines sag when they are heated up?
The only thing you can try to control is the temperature of the conductor. When loaded with wind and ice sag increases and when the temperature goes it the sag increases further. So forestry control is important to maintain clearances, as well as making sure the tensions do not exceed the support limits.
Jul
13
comment Why do power lines sag when they are heated up?
Some older information to be found in home.eng.iastate.edu/~jdm/wind/…
Jul
13
comment Why do power lines sag when they are heated up?
There are US standards for wind and ice depending on location. On top of that there are additional safety factors in order to take into account other knowns. All loading factors end up as a lbs/ft value to be added to the weight of the cable.
Jul
13
answered Rotation of center in rotational motion
Jul
13
answered What are the forces acting when we squeeze a ball? Free Body Diagram?