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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


12h
comment Do two waves of different frequencies create a resultant wave of lower frequency?
Related question: math.stackexchange.com/q/1321811/3301
18h
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.
18h
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.
18h
comment Calculate Spring Constant
Related: physics.stackexchange.com/a/126117/392
2d
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
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
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
comment About angular movement of pendulum
Yikes, Pro/E. I feel sorry for you.
Aug
19
comment Calculate torque to rotate and 84lb panel vertically from 0 - 90 degrees
If $c=\ell/2$ then $I+m c^2 = \frac{m}{12}\ell^2 + m c^2 = \frac{m \ell^2}{3}$
Aug
18
comment Calculate torque to rotate and 84lb panel vertically from 0 - 90 degrees
Also is the panel going to be moving slowly, or really fast? Is the rotational acceleration of the panel important here or not?
Aug
18
comment Calculate torque to rotate and 84lb panel vertically from 0 - 90 degrees
What is important is the distance between the pivot axis and the center of mass. Please specify.
Aug
18
comment Transfer of angular momentum during oblique impact with(out) adhesion
See homes.cs.washington.edu/~todorov/courses/amath533/Stewart00.pdf
Aug
18
comment Does a body always rotate purely about its center of mass?
Is this physics.stackexchange.com/a/102150/392 describes the situation, or are you talking in general?
Aug
18
comment Does a body always rotate purely about its center of mass?
The answer is not. If net forces are zero then the only motion possible is for the center of mass to move on straight line. Is the bottom of the rod in contact still, or is it in free fall?
Aug
18
comment Does a body always rotate purely about its center of mass?
possible duplicate of Do objects rotate around the torque vector or its center?