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Groups > sci.physics > #598656 > unrolled thread
| Started by | Serigo <invalid@invalid.com> |
|---|---|
| First post | 2016-09-28 10:44 -0500 |
| Last post | 2016-10-04 11:18 -0500 |
| Articles | 7 — 5 participants |
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Ball on turntable Serigo <invalid@invalid.com> - 2016-09-28 10:44 -0500
Ball on turntable HVAC <mr.hvac@gmail.com> - 2016-09-28 11:53 -0700
Re: Ball on turntable Serigo <invalid@invalid.com> - 2016-09-28 15:48 -0500
Re: Ball on turntable "reber g=emc^2" <herbertglazier0@gmail.com> - 2016-09-29 13:11 -0700
Re: Ball on turntable "hanson" <hanson@quick.net> - 2016-09-29 13:49 -0700
Re: Ball on turntable rbrteline@gmail.com - 2016-10-03 13:13 -0700
Re: Ball on turntable Serigo <invalid@invalid.com> - 2016-10-04 11:18 -0500
| From | Serigo <invalid@invalid.com> |
|---|---|
| Date | 2016-09-28 10:44 -0500 |
| Subject | Ball on turntable |
| Message-ID | <nsgohb$1t56$1@gioia.aioe.org> |
college level physics problem A ball with uniform mass density rolls without slipping on a turntable. Show that the ball moves in a circle (as viewed from the inertial lab frame), with a frequency equal to 2/7 times the frequency of the turntable. [hint: assume angular velocity of turntable, then of the ball, and realize the friction force from the turntable is responcable for changing both the balls linear momentum and its angular momentum. I classify this problem as hard. ]
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| From | HVAC <mr.hvac@gmail.com> |
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| Date | 2016-09-28 11:53 -0700 |
| Message-ID | <d8b5ce1b-8ba5-4051-a3e6-b9f239de57b8@googlegroups.com> |
| In reply to | #598656 |
Not only hard but thought provoking. So many forces to consider. I assume I can ignore Coriolis factors?
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| From | Serigo <invalid@invalid.com> |
|---|---|
| Date | 2016-09-28 15:48 -0500 |
| Message-ID | <nshaai$sgi$1@gioia.aioe.org> |
| In reply to | #598684 |
On 9/28/2016 1:53 PM, HVAC wrote: > Not only hard but thought provoking. So many forces to consider. I > assume I can ignore Coriolis factors? > yep, I declare this problem is too hard, it has moment of inertia of the ball in it, and 8 equations see solution 21 https://www.physics.harvard.edu/academics/undergrad/problems also checkout problem 3, where they prove a pencil can only be balanced on its tip for a max of 4 seconds, by anything.
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| From | "reber g=emc^2" <herbertglazier0@gmail.com> |
|---|---|
| Date | 2016-09-29 13:11 -0700 |
| Message-ID | <9dc028b1-ad98-43e0-9236-0d5d959aafaf@googlegroups.com> |
| In reply to | #598656 |
On Wednesday, September 28, 2016 at 8:44:47 AM UTC-7, Serigo wrote: > college level physics problem > > > A ball with uniform mass density rolls without slipping on a turntable. > > Show that the ball moves in a circle (as viewed from the inertial lab > frame), with a frequency equal to 2/7 times the frequency of the turntable. > > > > [hint: assume angular velocity of turntable, then of the ball, and > realize the friction force from the turntable is responcable for > changing both the balls linear momentum and its angular momentum. I > classify this problem as hard. ] Ball not being a perfect sphere adds to its friction.All this shows its gravity all the way. Trebert
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| From | "hanson" <hanson@quick.net> |
|---|---|
| Date | 2016-09-29 13:49 -0700 |
| Message-ID | <nsjutu$1s3$1@dont-email.me> |
| In reply to | #598854 |
"reber g=emc^2" <herbertglazier0@gmail.com> wrote: "All this shows all the way that Trebert Glazier's "g=emc^2" is short for "Glazier Exhibits Micro Cephalic Cretinism
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| From | rbrteline@gmail.com |
|---|---|
| Date | 2016-10-03 13:13 -0700 |
| Message-ID | <77e6e4f3-508c-4401-8371-0485cd5b8700@googlegroups.com> |
| In reply to | #598861 |
he probably had an i.q, at one time, but it aint much more than pi, now. the turntable is on the ball!
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| From | Serigo <invalid@invalid.com> |
|---|---|
| Date | 2016-10-04 11:18 -0500 |
| Message-ID | <nt0kp7$1eis$1@gioia.aioe.org> |
| In reply to | #599294 |
On 10/3/2016 3:13 PM, rbrteline@gmail.com wrote: > he probably had an i.q, at one time, but > it aint much more than pi, now. > > the turntable is on the ball! > relitivity states the turntable is on the ball, and the ball is on the turntable, at the same time. Now if the observer is on the ball....
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