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Nickname: Jack Crenshaw     Articles(0)    Visits(67544)    Comments(3)    Votes(5)    RSS
Jack Crenshaw's column features algorithms and plug-and-play routines, along with explanations of how they work.
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2013 -  May
2011 -  Jun.,  May.,  Mar
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Posted: 10:32:16 AM, 21/06/2011
There's some exciting news about a product I've lived with—and sometimes praised, sometimes cursed—for decades: Mathcad, PTC's premier math analysis tool. Regular readers know that most of my columns are math-oriented, as is most of my work. For that reason, I'm a hea......

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Posted: 11:32:01 AM, 14/06/2011
Physicists know that many problems can be treated as though the dynamical event happened instantaneously. Examples might include the impact of a hammer and nail, two billiard balls colliding, or a baseball bat hitting the ball. Deep down, we know that there is a complex interaction involve. Materi......

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Posted: 02:45:56 PM, 03/06/2011
Read the previous part here.   This is not an unreasonable approach, as long as you don't mind the 90 W part. A vertical descent is what we used for Surveyor and other unmanned missions. It simplifies the automated landing quite a bit, and you can change that landing longitude by making......

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Posted: 06:38:09 PM, 02/06/2011
Click here to view the previous part.   This approach is, in fact, the same one adopted by Euler, Lagrange, and company. In their formulation of the RTBP, they wrote the equations of motion in the rotating system, which meant that they had to add centrifugal and Coriolis terms to the equati......

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