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USim can do vacuum + gas http://www.txcorp.com/home/usim/usim-overview. Not technically true vacuum, but 9 orders of magnitude density jumps. It doesn't support an incompressible fluid (liquid) though.

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Given we are less than a month away from the equinox, I guess Stellarium is right.

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You need a good kinematic solver, to get the axle position path. At any point you can find by evaluating the instant center of rotation of the rear triangle. For 1) and 2) the center is fixed as there is single pivot. For 3) and 4) they indicate a virtual pivot, which is incorrectly placed. In reality it lies on the virtual intersection of the upper and ...

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Measuring dead-time (or other hardware efficiencies) is a non-trivial proposition, and there is no completely general solution. The answer that John gives in the comments ($\tau \times \text{number of events}$) is the best case: a system with few interconnections and no "extensible" contributions to the dead time. "Extensible" describes a system where ...

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You need to start by writing down the equations of motion. These can be obtained solely from energy considerations using the Lagrangian formulation of classical mechanics. The suspension on the front fork should be relatively easy to account for, but the rear suspension could be more difficult since some of them have rather complicated geometries. If you ...

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Just use the free-fall equation. The time spent in falling from a height $h$ verifies this: $h - \frac{g}{2} t^2 = 0$ So you get: $g = \frac{2h}{t^2}$ Note that you have to determine the height $h$. How?, maybe you can estimate it thinking that the game's character is about 1.80 m. The $g$ you are obtaining here is the acceleration of the ...

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Answer from 2C Solar: There are many 3D packages that render light aka raytracing, however most don't show the light itself. One very old method is POVray, started in 1991 and latest version 2013 The 3d package Spaceclaim can be used to create your laser / mirror model then export to POVRay where you need to define the properties. Bit of a learning curve ...

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