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visits member for 3 years, 11 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.


1h
comment Calculating vector to aim for moving asteroid (3D asteroid game)
I added a sketch in order to make the calculation clearer (I hope).
18h
comment Calculating vector to aim for moving asteroid (3D asteroid game)
Isn't the ship moving also, like the original asteroids?
18h
comment A question regarding 3 bodies connected as a system
This question would make more sense with massless rigid rods connecting the masses.
19h
comment One disk/ring in double rotation and sum of energy
Please read physics.stackexchange.com/help/how-to-ask
19h
comment A question regarding 3 bodies connected as a system
At time=0 there is no tension in the springs since deflection is unchanged.
1d
comment Where does the extra force generated by a lever come from?
For me the driving principle is that reactions do no work, and thus $\vec{F} \cdot \vec{v} =0$. If there is no motion $\vec{v}=0$ and there can be a reaction force $\vec{F}$. Dually if there is no force, there can be motion.
1d
comment Where does the extra force generated by a lever come from?
My point is that a fixed point is required for them to work. That is where the extra force comes from.
1d
comment Where does the extra force generated by a lever come from?
If the fulcrum is unstable and cannot generate the reaction force, then it won't work as a fulcrum and the payload will not see the force expected. Pulleys still don't work unless there is a fixed point somewhere to generate reaction forces.
1d
comment How do two rigid bodies with different 3rd moment of inertia rotate differently?
Can you please define the 3rd moment of inertia so we are all in the same footing. See "Be Specific" section of physics.stackexchange.com/help/how-to-ask
Oct
27
comment How do I describe and calculate the effect of an impacting object?
Peak strain of tissue would be the ultimate goal in describing the situation.
Oct
26
comment finding equation of a water droplet
I saw research recently that indicated falling droplets are light doughnuts or red blood cells in shape.
Oct
26
comment Rotational Inertia of Two rods
And I mentioned that the OP got the right result.
Oct
26
comment Rotational Inertia of Two rods
No, he had $I_{com}+m (h_1)^2$ instead of $I_{com} + M (h_1)^2$.
Oct
26
comment Rotational Inertia of Two rods
What is $h$? The figure shows $d$ for distances.
Oct
23
comment what make the bottom portion of a wheel in rolling motion move?
Here we are talking about the concept of instantaneous speed. The bottom at any instant does not move, but the next instant is not at the bottom any more.
Oct
23
comment Hooks Law and acceleration
So what is your question?
Oct
23
comment Is a double integral required to find the moment of Inertia of a non-uniform sphere?
Also see hyperphysics.phy-astr.gsu.edu/hbase/isph.html
Oct
23
comment Is a double integral required to find the moment of Inertia of a non-uniform sphere?
You can use a single integral if you consider multiple shells, like an onion.
Oct
22
comment Does a tire need to slip to generate force?
Notice that car handling is most influenced by the reaction moments produced by lateral forces. Those make the reaction center of the tire patch be behind the centroid of the patch such that the tire tracks (centers) as it rolls.
Oct
19
comment Underdetermined forces in a statics problem
Interesting question that relates to the painleve problem.