Recent content by PhysicsChode

The matrix I'm asking for, combined with a 3-vector for the 3 perpendicular radii of the ellipsoid (in this case a sphere) produces an ellipsoid with a rotation specified by the matrix.

What is the basic matrix form for a uniform (unit) sphere centered at the origin? Given a vector that specifies the radii (1,1,1) == (r1,r2,r3), I would like the matrix that implies no rotation (is it [[1,0,0],[0,1,0],[0,0,1]]?) and covers the rest of the necessary parameters. I am testing...

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Well, you will get wet as you will run into raindrops falling in front of you (already past the height of the top of your head), but then you will avoid raindrops about to fall on top of you (on your head). Regardless of if you run or walk you should walk/run into roughly the same amount of...

Yes. Deceleration is just a negative acceleration, so it will make F negative, and thus will be the opposing, unbalanced force (in this case the drag).