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visits member for 3 years, 10 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.


Mar
5
comment Angular Velocity after a frictional impulse
What if you have rotational velocity before the impact? That would change the final velocity also. Are you sure the general case is not talked about in a later chapter?
Mar
5
comment Angular Velocity after a frictional impulse
Look into math formatting your equations with mathjax
Mar
5
answered How is the torque reaction in a four-stroke engine produced?
Mar
4
comment Horizontal force on elevator?
Congrats! You just discovered the Corriolis forces!
Mar
4
answered Solving actual weight lifted
Mar
4
comment Solving actual weight lifted
If you lift slowly then it is half.
Mar
3
revised Equation of a flying kite
added 1 characters in body
Mar
3
answered Equation of a flying kite
Mar
3
comment Confusion over the gravitational potential energy inside a sphere
Can you explain what is $a$ and $r$ just to be clear. I think you are talking about a hollow shell, and the poster is talking about a solid sphere.
Mar
3
comment Total energy of a body following circular motion
You have just answered your own question with the equation posted.
Mar
2
comment Force on a line
BTW: Any planar motion can be decomposed as an instantaneous rotation about a single point. In 3D, the instantaneous motion is a rotation about a line coupled with a translation along the line (called Screw Motion).
Mar
2
comment Relative motion and how to calculate magnitude and velocity of objects relative to different given objects
Yes, but I get a sense the OP was confused on how to use $\arctan$ and so I wanted to demonstrate it. I consider it a learning opportunity since they now understand the details of such problems.
Mar
2
answered Force on a line
Mar
2
answered Relative motion and how to calculate magnitude and velocity of objects relative to different given objects
Feb
28
comment Rigid body rolling quesion
Aren't they connected with a rope/string?
Feb
27
comment Rigid body rolling quesion
Isn't the cylinder rolling on the incline? So the edge that is contacting as zero velocity and the outside edge has $v$. The average (center) as $\frac{v}{2}$.
Feb
27
answered Distribution of Kinetic energy after an Impact
Feb
27
answered Rigid body rolling quesion
Feb
27
comment Taking pivot about an accelerating point
Forces through the c.m. play no role in the angular equations of motion.
Feb
27
revised Taking pivot about an accelerating point
added 6 characters in body