6,717 reputation
1034
bio website
location United States
age
visits member for 3 years, 5 months
seen 1 hour ago

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
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.
Apr
14
comment $\psi^*$ if you have sine or cosine function
I think this is valid question for Mathematics. "What is the complex conjugate of a sine function?"
Apr
14
comment Coordinate System vs. Angular Properties vs. Centroid
See related post physics.stackexchange.com/a/95542/392 if interested in the subject.
Apr
14
revised Coordinate System vs. Angular Properties vs. Centroid
added 216 characters in body
Apr
14
answered Coordinate System vs. Angular Properties vs. Centroid
Apr
14
comment How long does it take for an electric car to go from 0 to 60 mph?
@jumpjack you are doing something wrong then. It is time to create a new question with the above, and show your work.
Apr
12
comment Describing a motion of gyroscope with gimbal
What I am missing above is the torques at the joints which accelerate the gimbal. Their result goes into joint moments $$\vec{\tau} = \hat{i} \tau_1 + E_1 \hat{j} \tau_2 + E_2 \hat{k} \tau_3$$