jbriggs444's latest activity
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jbriggs444 replied to the thread Undergrad Reference frames, center of rotation, etc.One can choose a center at B without choosing a coordinate system where B is moving along a straight line trajectory at constant speed... -
jbriggs444 reacted to A.T.'s post in the thread Undergrad Reference frames, center of rotation, etc with
Like.
The way to clear up that confusion is to learn the math, not endlessly go on about what your eyes see. Or you just forget about it and... -
jbriggs444 reacted to Dale's post in the thread Undergrad Reference frames, center of rotation, etc with Like.
Because the distance between the primary and the satellite can change. And if they are not both tidally locked then the distance between...
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jbriggs444 replied to the thread Undergrad Reference frames, center of rotation, etc.EDIT: The quoted passage above has been removed from the post in which it appeared. The next few paragraphs are now unmotivated. So I've...
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jbriggs444 replied to the thread Correct statement about random process of radioactive decay.An exponential distribution is an exponential distribution. The only difference is scale. I suspect that you are comparing the elapsed...
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jbriggs444 replied to the thread Correct statement about random process of radioactive decay.If you want the time between successive decays, you are concerned with an exponential distribution. One does then have a sampling...
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jbriggs444 reacted to A.T.'s post in the thread High School Thought Experiment: Behavior of shadow of object moving at speed c with
Agree.
I guess @Ibix refers to that fact that, if the object is very long (even when contracted), then you don't see both ends of its shadow... -
jbriggs444 reacted to A.T.'s post in the thread Undergrad Reference frames, center of rotation, etc with Like.
But the same applies here: - For mere kinematics, any "center of revolution" is as good as another. - For dynamics, there are choices...
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jbriggs444 replied to the thread Undergrad Reference frames, center of rotation, etc.So yes, you are talking about the case of two or more objects orbitting one another. In that case we do not have a rigid body and the...
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jbriggs444 replied to the thread High School Thought Experiment: Behavior of shadow of object moving at speed c.If the screen and eye are stationary then it should not matter. The shadow of a flash will obviously be ephemeral. The illumination from...
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jbriggs444 replied to the thread Undergrad Reference frames, center of rotation, etc.I have never encountered the term "center of revolution" in the context of physics. Nor has Google, it seems. The references it found...
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jbriggs444 reacted to Ibix's post in the thread Undergrad Reference frames, center of rotation, etc with Like.
Not really, because the problem is that there are multiple ways to break the motion of a rigid body into rotation and translation, and...
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jbriggs444 replied to the thread Undergrad Properties of angular momentum.By contrast to a rotating frame of reference. It is not spinning. We may take it as an article of faith that any "frame" we speak of...
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jbriggs444 replied to the thread Undergrad Properties of angular momentum.I want to be sure that I understand the setup precisely. When you speak of "the" rest frame of the system's CoM, I believe that you are...
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jbriggs444 replied to the thread High School Trying to understand wind forces on a door.What I believe @russ_watters is getting at is that if the rest of the house is tightly sealed then no wind will enter the front door...