Dale's latest activity
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Dale replied to the thread Undergrad Reference frames, center of rotation, etc.Excellent, except that you will want those as vectors, not just the magnitudes. So for the rotating $$v_l(t)=(-\omega l \sin(\omega... -
Dale replied to the thread Undergrad Reference frames, center of rotation, etc.I think that you need to work through the math for yourself. Why don’t you do it for the example you posted. Let’s simplify that the...
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Dale replied to the thread Undergrad Reference frames, center of rotation, etc.I agree. I think we have explained it every way possible. @gen x just needs to actually sit down and do the math.
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Dale reacted to weirdoguy's post in the thread Undergrad Reference frames, center of rotation, etc with
Like.
This whole thread rotates around the point that @gen x can't see a mathematical fact about kinematics without using math. I think that... -
Dale reacted to A.T.'s post in the thread Undergrad Reference frames, center of rotation, etc with
Informative.
I don't think you understood my post #57 at all. So again: If you choose a specific translation (like translation = 0 meaning pure... -
Dale replied to the thread Undergrad Reference frames, center of rotation, etc.No, you specified So there is no change to the motion. We are only changing how we decompose the motion into translation and rotation...
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Dale reacted to Hornbein's post in the thread Undergrad One does not “prove” the basic principles of Quantum Mechanics with
Skeptical.
Many models lead to the same math. So a wrong model can lead to correct mathematics. This happens all the time. -
Dale reacted to A.T.'s post in the thread High School Thought Experiment: Behavior of shadow of object moving at speed c with Like.
Length contraction is not a visual phenomenon. It is what remains, after you accounted for all the visual effects. Your shadow...
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Dale replied to the thread Undergrad Reference frames, center of rotation, etc.So what? Just because they are internal doesn't mean that they don't exist. The usual way is to redefine your system so that the...
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Dale replied to the thread Undergrad Reference frames, center of rotation, etc.Inside the ruler there is tension. As it is spinning the material of the ruler is under stress. The motion tries to pull the ruler...
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Dale replied to the thread Undergrad Reference frames, center of rotation, etc.Yes, this is all correct. This is not correct. The CoM moves along a straight line in any case, regardless of our choice of center of...
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Dale reacted to A.T.'s post in the thread Undergrad Reference frames, center of rotation, etc with Like.
@gen x might be referring to the instantaneous centre of rotation: https://en.wikipedia.org/wiki/Instant_centre_of_rotation The...
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Dale reacted to russ_watters's post in the thread Undergrad Reference frames, center of rotation, etc with Like.
I'm a mechanical engineer, so I get it: I sometimes find the physicists' view of things to be pedantic. But you need to recognize that...
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Dale replied to the thread Undergrad Reference frames, center of rotation, etc.The center of rotation certainly can translate. Did you not see the plots that I posted? They show what it means. You can pick any point...
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Dale replied to the thread Undergrad Reference frames, center of rotation, etc.Because the distance between the primary and the satellite can change. And if they are not both tidally locked then the distance between...