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# Need Help on mechanic question!

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1. Have got the part a) but don't have any clue on part b)...Need help plzzzzz
2. (Original post by Oliviazh)
Have got the part a) but don't have any clue on part b)...Need help plzzzzz
Consider the reaction between the particle and the hemisphere. What is it, and what value will it take as the particle is just about to leave the sphere?
3. (Original post by Oliviazh)
Have got the part a) but don't have any clue on part b)...Need help plzzzzz
Resolve radially to get the centripetal force (mv^2/r) that includes the reaction force, then solve for the reaction force and set the reaction force to 0 (flies off the surface, so reaction is zero) then re-arrange for cosine theta.

Edit: too late.
4. (Original post by Zacken)
Resolve radially to get the centripetal force (mv^2/r) that includes the reaction force, then solve for the reaction force and set the reaction force to 0 (flies off the surface, so reaction is zero) then re-arrange for cosine theta.

Edit: too late.
Thank you ! You are so helpful !
5. (Original post by ghostwalker)
Consider the reaction between the particle and the hemisphere. What is it, and what value will it take as the particle is just about to leave the sphere?
Thanks a lot!

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