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Help with problem about beads and a hoop

 
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Jan19-05, 06:48 PM   #1
 

Help with problem about beads and a hoop

Thanks for the help
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Jan19-05, 07:53 PM   #2
 
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Quote by newcool
Consider this problem:

http://www.physics.harvard.edu/probweek/prob35.pdf

The solution is here:

http://www.physics.harvard.edu/probweek/sol35.pdf


Why is N and [tex]mg *\cos\theta [/tex]both positive? I thought N point away from the hoop
No N is inward. The beads try to go outward, but the loop pulls them inward.
Jan19-05, 09:56 PM   #3
 
Thanks, I got the first part, anyone have any idea bout the second?
Jan19-05, 10:22 PM   #4
 
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Help with problem about beads and a hoop

Quote by newcool
Thanks, I got the first part, anyone have any idea bout the second?
Yes, the second part looks right to me.
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