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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.


2h
answered Sum of torque from a sphere
2h
answered Do particles rotate around themselves or they just move while the object rotates?
17h
comment Sum of torque from a sphere
So if only the contact forces are acting then there is zero net torque applied. All forces go through the center of mass.
22h
comment Sum of torque from a sphere
I think your diagram is wrong. The red forces are always perpendicular to the walls, and the resulting friction $F_1$ and $F_2$ needs to be parallel to the walls. That is if the ball is rotating relative to the walls.
23h
comment Visualizing Tension in FBD — Rope With Mass
Where in the FBD you have $T_m$?
1d
comment Visualizing Tension in FBD — Rope With Mass
Split the rope in half and lump the mass to the blocks, making them 7 kg and 8 kg each. Then the force accelerating the bottom block up is decelerating the top block (equal and opposite forces).
Apr
19
answered Tuned Mass Damper
Apr
18
comment Equivalent Force from Pressure
Where is your Free Body Diagram?
Apr
17
comment How long does it take for an electric car to go from 0 to 60 mph?
Now that is funny!
Apr
16
comment Can a force applied to a wheel find the fastest way of getting to the other side?
BTW look up stress waves.
Apr
16
comment Moment of inertia of rotating particles in center of mass frame?
possible duplicate of How does this formula for calculating the "mass sum" in a collision translate to 3D?
Apr
16
comment Moment of inertia of rotating particles in center of mass frame?
IF you want to do 3D rigid body collision it gets really complicated really fast.
Apr
16
comment “Derivation” of the Heisenberg Uncertainty Principle
This derivation is not rigorous, it is just illustrative.
Apr
16
comment “Derivation” of the Heisenberg Uncertainty Principle
There will be an $x$ where they are all in phase. Take the CGD of the wavelengths to find where this is. Can can than do a change of coordinates to that node and it wont change the equations, nor the outcome.
Apr
16
comment How long does it take for an electric car to go from 0 to 60 mph?
Related answer physics.stackexchange.com/a/15620/392
Apr
16
comment If the axis of rotation is fixed, is it ok to say clockwise torque?
In fact when you do statics, you start by counting up all the resulting torques as +CCW and -CW, so just saying clockwise automatically means a negative value. Only in statics though, because the sum of moments is the same regardless of the point of reference. In dynamics, you must choose torques about the center of mass, always.
Apr
16
answered Acceleration is zero, for non-zero net force
Apr
15
comment Lateral forces on earths surface
If the giant sphere was resting on a frictionless surface then it would appear as if it was spinning in place.
Apr
14
comment Coordinate System vs. Angular Properties vs. Centroid
Yes, 3D dynamics and kinematics are straight forward if you get all your ducks in a row, but there are a lot of ducks to account for.
Apr
14
comment $\psi^*$ if you have sine or cosine function
@JamalS is it? You can have $\sin(\hat{i}) = \hat{i} \left( \frac{\hat{e}}{2} - \frac{1}{2 \hat{e}} \right)$. I think the answer is it depends on what $x$ is.