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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.


Mar
13
revised Can net torque $\sum_i\mathbf r_i\times\mathbf F_i$ be expessed as $\mathbf r\times$ (net force) for some $\mathbf r$?
added 389 characters in body
Mar
13
answered Can net torque $\sum_i\mathbf r_i\times\mathbf F_i$ be expessed as $\mathbf r\times$ (net force) for some $\mathbf r$?
Mar
11
comment How to find the centre of mass of 3 masses (astronauts and a rock) connected by a rope
The reason I stated it as I did because it describes the fact that the net mass at $\vec{c}$ equals all the masses at their own $\vec{r}$
Mar
11
comment Derive Equation for Position of Antinode
Related: physics.stackexchange.com/a/76138/392
Mar
11
comment Position, Velocity And acceleration relations
There is a subtle trick here. The simple method described is an implementation of Implicit Euler
Mar
11
answered How to find the centre of mass of 3 masses (astronauts and a rock) connected by a rope
Mar
10
answered Conceptual Understanding of Reference Frames correct?
Mar
8
comment Distinguishing between solid spheres and hollow spheres (equal mass)
I am wondering if bouncing them will produce different results.
Feb
26
comment Why am I not accelerated by the reaction force applied by Earth on me?
possible duplicate of With Newton's third law, why are things capable of moving?
Feb
24
comment Is rolling friction exists only when one body rolls over a plane surface?
Not enough information provided. B can be rolling inside A, or it can be sliding w.r.t. A.
Feb
24
comment What is a self adjusting force?
I dont think it is standard term. It could mean a force that is a function of position, but it sure is an obtuse way of stating this.
Feb
24
comment What is a self adjusting force?
In what context?
Feb
24
comment How are photons made?
Think of a photon as a way to transfer a package of energy from one place to another.
Feb
24
comment Force acting on a polar molecule
Have you looked up diatomic molecules and the strength of bonds?
Feb
24
revised How to analyse this mass-spring system
added 309 characters in body
Feb
24
revised How to analyse this mass-spring system
added 309 characters in body
Feb
24
answered How to analyse this mass-spring system
Feb
23
comment What will happen to the center of mass of the human body when a person carries a weight with one hand?
What is unclear is why you are asking. There has to be more to this than just the question in the title alone.
Feb
22
comment Confused on how to properly use right hand rule
I agree. I make the thumb go towards the positive moment and see if the curled fingers point in the direction of the force. If not it is a negative torque, otherwise it is positive.
Feb
21
comment How to compute the inertia tensor ${\bf{J}} _{\Omega}$ of a body of revolution
Did you use $\vec{r}(x,y,\theta) = (x,y \cos\theta,y \sin \theta)$ and $[\vec{r}\times] = \begin{bmatrix}0&-y \sin\theta&y \cos \theta \\ y \sin\theta & 0 & -x \\ -y \cos\theta & x & 0 \end{bmatrix}$ the 3×3 skew symmetric matrix? Then perform the integral over $\theta$ and it will become diagonal since the off diagonal terms are of $\cos \theta$ or $\sin \theta$ form.