jbriggs444's latest activity
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jbriggs444 reacted to sophiecentaur's post in the thread I The solution to the balancing ball paradox with
Like.
Thanks. That dug me out of the problem perfectly. That sign difference gives a 'i', which was not uppermost in my mind after all that... -
jbriggs444 reacted to DaveC426913's post in the thread I The solution to the balancing ball paradox with
Agree.
Is that essentially the difference between a negative feedback loop and positive feedback loop? (A ball rolling in a trough, versus a... -
jbriggs444 replied to the thread I The solution to the balancing ball paradox.The characteristic equation for the differential equation with ##k## positive delivers two real roots. The characteristic equation for...
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jbriggs444 replied to the thread I The solution to the balancing ball paradox.None of these physical circumstances are very important. One ends up with a differential equation which is (in the region near the top...
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jbriggs444 reacted to DaveC426913's post in the thread I The solution to the balancing ball paradox with Like.
"..in an otherwise empty system..." i.e. no other bodies to complicate the problem.
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jbriggs444 replied to the thread Slight Confusion in Introductory Mechanics (Dynamics Problem).The acceleration need not and does not switch signs. If we extended the scenario continuously into the past, we would see that the...
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jbriggs444 reacted to A.T.'s post in the thread B The work done by two objects on each other with Like.
If you are not clear about what is doing the work on what for the work quantities you define, then you are not being scrupulous.
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jbriggs444 replied to the thread I The solution to the balancing ball paradox.The shape of the potential hill is different. This means that the differential equation of motion is different. Naturally, the...
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jbriggs444 replied to the thread I The solution to the balancing ball paradox.You seem to have missed the interesting feature of the situation. An ideal pencil, perfectly balanced on its point needs a starting...
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jbriggs444 reacted to martinbn's post in the thread I The solution to the balancing ball paradox with Like.
https://sites.pitt.edu/~jdnorton/Goodies/Dome/index.html
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jbriggs444 replied to the thread I The solution to the balancing ball paradox.It depends on what you mean by "time reversible". The same solution played out in reverse obeys the laws of Newtonian mechanics. In...
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jbriggs444 replied to the thread I The solution to the balancing ball paradox.Whether infinite time is required depends on the shape of the hill. For a roughly hemispherical hill... The instantaneous deceleration...
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jbriggs444 reacted to kuruman's post in the thread Angular motion of a car wheel traveling at certain speed with Like.
Either way you will get the same answer if you do it right. Using the average angular velocity as @jbriggs444 suggested is more...
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jbriggs444 replied to the thread Angular motion of a car wheel traveling at certain speed.Or, another approach, can you (@inuka00123) find the average angular speed over the interval?