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visits member for 3 years, 8 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.


Jul
8
comment Calculate Euler equations of fluid dynamics without division?
Can you do deferred division, it terms of keeping an numerator and denominator separately?
Jul
8
comment Solving for motion of rotating rod using only Newton's laws?
Newton's Laws only apply to point masses. You need Euler's laws of rotation rigid body motion. If the space is 2D or 3D it does not matter really.
Jul
7
comment Inertia tensor of a spherical cap
Is the inertia about the sphere center (origin), or about the center of mass?
Jul
7
revised A simple way of calculating Euler Angles from Rotation Matrix — help!
added 175 characters in body
Jul
7
answered A simple way of calculating Euler Angles from Rotation Matrix — help!
Jul
7
answered Potential energy of a rotating bar
Jul
7
answered Physical Role of Batter in Baseball
Jul
2
awarded  Curious
Jul
2
comment What is the relationship between Coriolis forces and Angular momentum?
Coriolis is really a kinematics term, whereas forces and momentum are not involved. It is a result of a changing vector on moving reference frame.
Jul
1
comment How to know the Direction of the Acceleration Vector?
You assume a positive direction for displacement, velocity and acceleration and if the result is negative then the result is in the opposite direction.
Jun
26
comment Why doesn't static friction decelerate a rolling body?
Ideally, static friction is zero for a rolling body. It only exists for an accelerating body.
Jun
26
answered Why does moment of force depend on the perpendicular distance?
Jun
17
awarded  Revival
Jun
13
answered Equations of graphs
Jun
13
comment Equations of graphs
The best results come from a relationship that makes physical sense. Maybe instead of speed you plot kinetic energy and then a nice line might show up.
Jun
12
comment Calculating forces efficiently in Lagrangian formalism
Ehm, sketch please.
Jun
12
comment Contra-rotating propellers torques
You know the blade aerodynamics are going to different between the top and and bottom blade so there is going to be an overall yaw trend related to the applied motor torque and lift produced.
Jun
11
comment average speed and velocity
How is speed given in the question and asked for in the answer. Something does not make sense here. Oh, and please show your work when posting question, since this is not a "we do your homework for you" type of website.
Jun
11
comment Static equilibrium question
$A_x = \mu A_y$ leads to $$M (\cot\theta - \mu) = m (\mu - \frac{1}{2} \cot\theta)$$ If $\theta \rightarrow \frac{\pi}{2}$ then a huge amount of friction is needed to keep it stable because or the bottom is going to slide away.
Jun
11
comment Static equilibrium question
I used PowerPoint with a LaTeX add-in called IguanaTex for the labels.