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This thread was created on November 11, 2007
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•AP Physics much?

AP Physics B - Circular Motion Goto page 1, 2  Next

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PostPosted: Sun Nov 11, 2007 7:22 pm    Post subject: AP Physics B - Circular Motion Reply with quote
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?



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. Very Happy

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PostPosted: Sun Nov 18, 2007 3:46 am    Post subject: Reply with quote
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. Razz

So here it goes!

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PostPosted: Sun Nov 18, 2007 3:47 am    Post subject: Reply with quote
Part two...

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PostPosted: Sun Nov 18, 2007 3:48 am    Post subject: Reply with quote
And three...

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PostPosted: Sun Nov 18, 2007 3:49 am    Post subject: Reply with quote
Part four...

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PostPosted: Sun Nov 18, 2007 3:50 am    Post subject: Reply with quote
Now... the equations!

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PostPosted: Sun Nov 18, 2007 5:08 am    Post subject: Reply with quote
Finding x...

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PostPosted: Sun Nov 18, 2007 5:09 am    Post subject: Reply with quote
What is initial angle?

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PostPosted: Sun Nov 18, 2007 5:10 am    Post subject: Reply with quote
Solving!

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PostPosted: Sun Nov 18, 2007 5:29 am    Post subject: Reply with quote
Now... for the third question!

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PostPosted: Sun Nov 18, 2007 5:30 am    Post subject: Reply with quote
...continuing the problem!

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PostPosted: Sun Nov 18, 2007 6:03 am    Post subject: Reply with quote
Finally! The fourth problem!

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PostPosted: Sun Nov 18, 2007 6:04 am    Post subject: Reply with quote
Part two...

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PostPosted: Sun Nov 18, 2007 6:07 am    Post subject: Reply with quote
And finally! The last post here! Remember, if you need any physics help, just PM me or something and show me your problems. Wink

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. Razz

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. Smile

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PostPosted: Tue Nov 20, 2007 12:34 am    Post subject: Reply with quote
...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*

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This thread was created on November 11, 2007

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