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visits member for 4 years, 7 months
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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.


Jun
28
comment Why is my two body model not working?
Writing a well behaved simulator is hard. But the rewards are awesome as you learn all there is to know. You are in step one and this answer takes you through steps 2, 3 and 4. The more you work at it the more nuances you tackle taking you through steps 5...12. You have earned a PhD at this point.
Jun
18
comment Darcy friction factor
Yes, this is exactly how you can do it.
Jun
17
comment Darcy friction factor
Alternatively you can try $L' = \frac{\partial L}{\partial f}f' + \frac{\partial L}{\partial \epsilon}\epsilon'+\frac{\partial L}{\partial R_e}R_e'$ but it looks to be very messy.
Jun
17
comment Darcy friction factor
I only did 1 point, so I cannot comment. It is up to you now.
Jun
15
comment Acceleration of two masses attached by a pulley in an elevator
You mean this? physics.stackexchange.com/a/79182/392
Jun
15
comment Acceleration of two masses attached by a pulley in an elevator
Indeed. I did the same problem but with a pulley with mass and inertia and the results work ok the same at the limit.
Jun
15
comment Acceleration of two masses attached by a pulley in an elevator
Yes. I have revised my answer, and revisited my assumptions.
Jun
11
comment What is the physics of traffic speed limit?
The department of transportation sets the limit as low as possible without people complaining too much. The design limits are much higher than the actual limits.
Jun
11
comment How can tangential acceleration from a radial force be explained?
Personally I love it when geometry can explain concepts better than equations.
Jun
11
comment Force applied off center on an object
Yes, I edited the question.
Jun
10
comment Is the Earth the center of the Solar System?
In mechanics it makes things much simpler to evaluate your equations of motion on the center of mass.
Jun
10
comment Get coefficient of friction given mass, forward force, and acceleration?
Use $g=9.80665$ which is the SI standard value.
Jun
9
comment Angular acceleration - radial & tangential
See derivation here: physics.stackexchange.com/a/185246/392
Jun
7
comment Newtons Cradle, Collision Theory
Yes, $J$ is an impulse. It has units of $\mbox{Newton Second}$. A very big force acting over a small amount of time multiples together make a not so big impulse $J$.
Jun
3
comment Spring Stiffness Calculation Problems
I would change the title to "dynamic spring calculation" or something similar in order to get more interest.
Jun
2
comment Moment of inertia tensor calculation
Well he did need the parallel axis theorem becasue it is used in the accepted answer.
Jun
2
comment Moment of inertia tensor calculation
versor=vector right?
Jun
2
comment Moment of inertia tensor calculation
What is an ord? A sketch might help here. Also I suppose you know about the parallel axis theorem.
Jun
1
comment Elastic collision of rotating bodies
You shouldn't be adding linear to angular momentum. They have different units. The correct relationship is $$\vec{L}_A = \vec{L}_B + \vec{r}_{AB} \times \vec{P}$$ See physics.stackexchange.com/a/183650/392
Jun
1
comment Paradox in the two block problem
possible duplicate of Friction forces and sliding slabs