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visits member for 2 years, 5 months
seen Nov 25 '13 at 17:06

Apr
25
comment How important is it, really, to clean vacuum parts?
Haven't we all done that? Hah!
Apr
18
revised Closed-form equation for orientation and angular velocity over time
Added a little detail.
Apr
18
asked Closed-form equation for orientation and angular velocity over time
Jan
3
comment Can any physical rigid body be represented by an ellipsoid with the same angular dynamics?
Perfect. Thank-you.
Jan
3
accepted Can any physical rigid body be represented by an ellipsoid with the same angular dynamics?
Jan
3
awarded  Yearling
Jan
3
asked Can any physical rigid body be represented by an ellipsoid with the same angular dynamics?
Dec
4
awarded  Caucus
Dec
4
awarded  Constituent
Jul
13
accepted The Double Integrator: Matching velocity and position as quickly as possible with only a limited amount of force available
Jan
24
comment The Double Integrator: Matching velocity and position as quickly as possible with only a limited amount of force available
Perfect. Thanks. It seems unintuitive that a bang-bang strategy would be optimal, but what you've illustrated makes sense. It's also interesting how the critical damping co-efficient of $\zeta=1$ is built into the configuration space as a slope of $\pm 1$.
Jan
22
answered how to represent the effect of linking rigid-bodies together?
Jan
19
asked The Double Integrator: Matching velocity and position as quickly as possible with only a limited amount of force available
Dec
31
awarded  Teacher
Dec
31
answered Physics simulation software to perform this very specific experiment
Dec
24
accepted Converting angular velocity to linear velocity through friction
Dec
24
comment Converting angular velocity to linear velocity through friction
Conservation of energy seems right. This should work for what I need (although I'll need it in 3d; so $\omega r$ needs to be $\omega \times r$ which means that I've got to do a little bit of playing to solve for $v_1$). Thanks.
Dec
23
asked Converting angular velocity to linear velocity through friction
Nov
23
comment How do you combine two rigid bodies into one?
@Qmechanic I really did want to know where the velocities go if two independent bodies become a single rigid body. However, as an after-thought I wanted to know if you can talk about the instantaneous velocities of a single system composed of multiple independent rigid bodies. E.g., if a ballistic rigid body were to fracture into multiple pieces, the linear and angular momentum of the system should be conserved; so I wonder if you could add up the pieces and get a measurement of the instantaneous linear and angular velocities of the system.
Nov
23
awarded  Scholar