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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. #SOreadytohelp


1d
comment Do two waves of different frequencies create a resultant wave of lower frequency?
Related question: math.stackexchange.com/q/1321811/3301
1d
answered Calculate Spring Constant
1d
comment Calculate Spring Constant
I think a better design would be to use some plastic stops which give when hit over 10mph and use the springs as a return mechanism so the stumps don't flatten out completely.
1d
comment Calculate Spring Constant
Good question. Those look like extension springs. In your question you phrase it like they are going to be compression springs. Can you please provide more details on the design and the side the ball is going to impact in order to understand better.
1d
comment Calculate Spring Constant
Related: physics.stackexchange.com/a/126117/392
Aug
25
comment modelling the sound wave of a guitar string with an equation
Hey, Great Code. I did a spin off, that simulates the plucking action a little better. Look at khanacademy.org/computer-programming/string-pluck-code/…
Aug
25
answered modelling the sound wave of a guitar string with an equation
Aug
25
revised How to calculate the moment of inertia of a solid cube
Fixed incorrect $\hat{e}$ vector
Aug
25
answered How to calculate the moment of inertia of a solid cube
Aug
24
answered Very basic question about vector
Aug
23
comment How much do the rear and front, side-parts of this 2,400 lb. car weigh?
In racing there is something called "corner weights" essentially you put up each tire over a scale to get the weight of each quadrant of the car.
Aug
23
comment How much do the rear and front, side-parts of this 2,400 lb. car weigh?
Look up the weight distribution for this model year corolla. Alternatively estimate a 57% front 43% back, with a 2300 lbs total dry weight.
Aug
21
comment How does friction act on a body, if only 2 regions on it are rough?
Your question is unclear to me. Friction acts on each little patch of contact in a way that always opposes motion.
Aug
21
comment What is the tension at a particular point in this case?
Hint: There are two equations. One for the block and one for the rope. The tension at A acts on both with opposite sense. In the overall equation you present, the tension does not play a role.
Aug
20
comment Transfer of angular momentum during oblique impact with(out) adhesion
And rspa.royalsocietypublishing.org/content/471/2177/20140859
Aug
20
comment Transfer of angular momentum during oblique impact with(out) adhesion
Found cs.cmu.edu/afs/cs/academic/class/16741-s07/www/oldlecture16.pdf
Aug
20
answered Moment of Inertia of an L-shaped object
Aug
20
comment Moment of Inertia of an L-shaped object
The equation is ${\rm d} I_z = (x^2+y^2)\,{\rm d}m$ which you need to integrate over the cross section domain. Your $I=m r^2$ is incorrect, unless $r$ is exactly the radius of gyration of the section.
Aug
20
answered About angular movement of pendulum
Aug
20
comment About angular movement of pendulum
Yikes, Pro/E. I feel sorry for you.