Understanding Centripetal Force in a Central Force System | Homework Statement

[raman911]

Homework Statement

http://img147.imageshack.us/img147/7830/scan0001ym3.png

The Attempt at a Solution

A)
i think force of Tension give them necessary centripetal force directed toward the center of the cylinder.

C)
Centripetal Force

Plz help me

 

[raman911]

Plz help me

 

[raman911]

please help me ??