# Help with problem about beads and a hoop

by newcool
 P: 42 Thanks for the help
HW Helper
P: 4,125
 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 $$mg *\cos\theta$$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.
 P: 42 Thanks, I got the first part, anyone have any idea bout the second?
HW Helper
P: 4,125

## 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.

 Related Discussions Introductory Physics Homework 13 Advanced Physics Homework 1 Introductory Physics Homework 2 Introductory Physics Homework 4 Brain Teasers 8