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AP Physics B - Circular Motion



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Sun Nov 11, 2007 7:22 pm
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Cade says...



Haha, so Colly has failed a physics test because the physics department decided to make all the questions in variable form instead of using real numbers.
Fortunately, her wonderful physics teacher gives back points for test corrections. Please help?

Image

Here's this object going around in a circle on a string. When the string snaps, the object has speed Vo and the circular path has radius R and height h above the ground.

Determine the following. Express all answers in terms of h, Vo (that's initial velocity), and g.

1) Time required for object to hit ground.
2) Horizontal distance the object travels from the time the string breaks until it hits the ground.
3) Speed of the object just before it hits the ground. (All we're supposed to do here is write appropriate force equations.
4) Determine tension in the string just before it breaks. Express answer in terms of M (mass of object), R, Vo, and g.

As added incentive, I will give you a crit if you help me. :D
"My pet, I've been to the devil, and he's a very dull fellow. I won't go there again, even for you..."
  





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Sun Nov 18, 2007 3:46 am
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Snoink says...



Next time, PM me so I can see the topic easier. A week has gone by and... nothing!

So yeah. I sort of did the problem. Mind you, I don't know if I got everything right -- remember, I failed a lot of my physics tests too! But hopefully, these ideas might put you on the right track of solving them.

I labeled it so that hopefully you would understand the thought process and everything -- forgive the crappy drawings. They help me... they might not help you. I don't know. :P

So here it goes!
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Last edited by Snoink on Sun Nov 18, 2007 3:53 am, edited 2 times in total.
Ubi caritas est vera, Deus ibi est.

"The mark of your ignorance is the depth of your belief in injustice and tragedy. What the caterpillar calls the end of the world, the Master calls the butterfly." ~ Richard Bach

Moth and Myth <- My comic! :D
  





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Sun Nov 18, 2007 3:47 am
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Snoink says...



Part two...
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Ubi caritas est vera, Deus ibi est.

"The mark of your ignorance is the depth of your belief in injustice and tragedy. What the caterpillar calls the end of the world, the Master calls the butterfly." ~ Richard Bach

Moth and Myth <- My comic! :D
  





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Sun Nov 18, 2007 3:48 am
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Snoink says...



And three...
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Ubi caritas est vera, Deus ibi est.

"The mark of your ignorance is the depth of your belief in injustice and tragedy. What the caterpillar calls the end of the world, the Master calls the butterfly." ~ Richard Bach

Moth and Myth <- My comic! :D
  





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Sun Nov 18, 2007 3:49 am
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Snoink says...



Part four...
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Ubi caritas est vera, Deus ibi est.

"The mark of your ignorance is the depth of your belief in injustice and tragedy. What the caterpillar calls the end of the world, the Master calls the butterfly." ~ Richard Bach

Moth and Myth <- My comic! :D
  





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Sun Nov 18, 2007 3:50 am
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Snoink says...



Now... the equations!
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Ubi caritas est vera, Deus ibi est.

"The mark of your ignorance is the depth of your belief in injustice and tragedy. What the caterpillar calls the end of the world, the Master calls the butterfly." ~ Richard Bach

Moth and Myth <- My comic! :D
  





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Sun Nov 18, 2007 5:08 am
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Snoink says...



Finding x...
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Ubi caritas est vera, Deus ibi est.

"The mark of your ignorance is the depth of your belief in injustice and tragedy. What the caterpillar calls the end of the world, the Master calls the butterfly." ~ Richard Bach

Moth and Myth <- My comic! :D
  





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Sun Nov 18, 2007 5:09 am
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Snoink says...



What is initial angle?
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Ubi caritas est vera, Deus ibi est.

"The mark of your ignorance is the depth of your belief in injustice and tragedy. What the caterpillar calls the end of the world, the Master calls the butterfly." ~ Richard Bach

Moth and Myth <- My comic! :D
  





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Sun Nov 18, 2007 5:10 am
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Snoink says...



Solving!
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Ubi caritas est vera, Deus ibi est.

"The mark of your ignorance is the depth of your belief in injustice and tragedy. What the caterpillar calls the end of the world, the Master calls the butterfly." ~ Richard Bach

Moth and Myth <- My comic! :D
  





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Sun Nov 18, 2007 5:29 am
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Snoink says...



Now... for the third question!
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Ubi caritas est vera, Deus ibi est.

"The mark of your ignorance is the depth of your belief in injustice and tragedy. What the caterpillar calls the end of the world, the Master calls the butterfly." ~ Richard Bach

Moth and Myth <- My comic! :D
  





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Sun Nov 18, 2007 5:30 am
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Snoink says...



...continuing the problem!
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Ubi caritas est vera, Deus ibi est.

"The mark of your ignorance is the depth of your belief in injustice and tragedy. What the caterpillar calls the end of the world, the Master calls the butterfly." ~ Richard Bach

Moth and Myth <- My comic! :D
  





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Sun Nov 18, 2007 6:03 am
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Snoink says...



Finally! The fourth problem!
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Ubi caritas est vera, Deus ibi est.

"The mark of your ignorance is the depth of your belief in injustice and tragedy. What the caterpillar calls the end of the world, the Master calls the butterfly." ~ Richard Bach

Moth and Myth <- My comic! :D
  





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Sun Nov 18, 2007 6:04 am
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Snoink says...



Part two...
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Ubi caritas est vera, Deus ibi est.

"The mark of your ignorance is the depth of your belief in injustice and tragedy. What the caterpillar calls the end of the world, the Master calls the butterfly." ~ Richard Bach

Moth and Myth <- My comic! :D
  





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Sun Nov 18, 2007 6:07 am
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Snoink says...



And finally! The last post here! Remember, if you need any physics help, just PM me or something and show me your problems. ;)

And remember, take these answers with a grain of salt. I hope they're all right and they look fine to me, but I have made many mistakes before, as my physics teacher knows, so I wouldn't trust them entirely. :P

And if you have ANY questions whatsoever, please please PLEASE ask! My scrawls can be unreadable, and so any questions you have about my ramblings are very valid.

Anyway! The last answer!

I hope this helped. :)
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Ubi caritas est vera, Deus ibi est.

"The mark of your ignorance is the depth of your belief in injustice and tragedy. What the caterpillar calls the end of the world, the Master calls the butterfly." ~ Richard Bach

Moth and Myth <- My comic! :D
  





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Tue Nov 20, 2007 12:34 am
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Cade says...



...OMG SNOINKUS.


WHY DO YOU WIN AT LIFE?


I'd bake you a cake but I don't think I could mail it to you properly.



*love*
"My pet, I've been to the devil, and he's a very dull fellow. I won't go there again, even for you..."
  








It had a perfectly round door like a porthole, painted green, with a shiny yellow brass knob in the exact middle. The door opened on to a tube-shaped hall like a tunnel: a very comfortable tunnel without smoke, with panelled walls, and floors tiled and carpeted, provided with polished chairs, and lots and lots of pegs for hats and coats—the hobbit was fond of visitors. The tunnel wound on and on, going fairly but not quite straight into the side of the hill —The Hill, as all the people for many miles round called it—and many little round doors opened out of it, first on one side and then on another.
— JRR Tolkien