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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.


1d
comment Underdetermined forces in a statics problem
Interesting question that relates to the painleve problem.
1d
comment Underdetermined forces in a statics problem
If the angle was less than the critical angle then the reaction would be within the friction cone and the problem would be undetermined. As it stands now the problem is deterministic since you can safely assume micro slipping in the interface with $F = \mu N$ exactly. That is if $\mu<1$.
2d
comment How to calculate magnitute of average acceleration?
This question is more about unit conversions than about calculating acceleration.
2d
revised How to calculate magnitute of average acceleration?
edited tags
Oct
18
comment Why do white dwarfs shine white?
I learned that the sun from space appears white. So a white dwarf with the same outer temperature will appear the same color.
Oct
16
revised Rolling a ball into a cone; what should the forces overall be?
added 240 characters in body
Oct
16
comment Rolling a ball into a cone; what should the forces overall be?
To consider the rotational inertia complicates the equations because the only thing providing a torque is friction. My background is in robotics and dynamics.
Oct
15
comment Angular displacement after full rotation
You need to provide more context here. At least a reference or something. Besides the obvious displacement = n × 360°.
Oct
15
comment Case of the mysterious bullets (taken from Mad About Physics)
possible duplicate of Veritasium - Firing bullet in block - along center and away from center
Oct
15
revised Rolling a ball into a cone; what should the forces overall be?
added 229 characters in body
Oct
15
answered Rolling a ball into a cone; what should the forces overall be?
Oct
15
comment Rolling a ball into a cone; what should the forces overall be?
@julianfernandez If you assume pure rolling always, the friction coefficient should cancel out and equations should simplify. Please show your work for the community.
Oct
15
comment Tensorial version of Hooke's law
Your forces usually come from statics or dynamics. They are transformed into stresses and then strains to be re-transformed into deflections. In the end you have your stiffness matrix.
Oct
15
comment Tensorial version of Hooke's law
Did you read Wikipedia on isotropic materials fully? Also look at en.wikipedia.org/wiki/Linear_elasticity
Oct
15
comment Tensorial version of Hooke's law
Is there a particular example you are working with? The answer is geometry dependent.
Oct
14
answered Equation for Terminal Velocity on an inclined plane and the time it takes to reach it
Oct
14
revised Finding the Direction when resolving a Vector
added 6 characters in body
Oct
13
answered energy required to start and then stop rotating an object, when we have gravity
Oct
12
comment If a mass $m$ whirls with constant speed $v$ at the end of a string of length $R$, what is the force on $m$ in the absence of friction or gravity?
Related or duplicate: physics.stackexchange.com/a/99570/392
Oct
12
comment If a mass $m$ whirls with constant speed $v$ at the end of a string of length $R$, what is the force on $m$ in the absence of friction or gravity?
I have seen $$\vec{r} = \frac{\vec{\omega} \times \vec{v}}{\omega^2}$$ before, but never the expression above. It makes sense to me. Do you have a reference of where it is used/described?