Tagged Questions
0
votes
1answer
51 views
Calculating the angular velocity
I have an inverted pendulum with a accelerometer mounted on the top that at rest gives me a vector up opposite to gravity, which is used to calculate the angle of the pendulum. Is it possible to ...
0
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0answers
121 views
sinusoidal word problem
in tidal waves the sea level drops first leaving the seabed exposed (normally 30 feet below sea level), then it rises a equal distance above sea level. waves hitting a city have a max height of 38.9 ...
7
votes
1answer
336 views
Does apparent retrograde motion of planets begin and end at quadrature?
I've read it several places that the apparent retrograde motion of planets (during which they seem, as viewed from Earth, to move in the opposite sense of their normal "direct" orbital motion against ...
5
votes
1answer
105 views
A trigonometric identity
If one sees the simplification done in equation $5.3$ (bottom of page 29) of this paper it seems that a trigonometric identity has been invoked of the kind,
$$\ln(2) + \sum _ {n=1} ^{\infty} ...
