Please do all parts (answers for part b amd c are given) and show work, thank you!

(a) A cylindrical liquid drop of radius R is in between two solid plates. The contact angle is 90. Show that the force between the two plates will always be attractive and equal to R1v. (b) What would be the force if the liquid surface were a cube of volume V? Answer: 4V1/31v. (c) At what angle(s) would the force be zero if the liquid between the plates retained straight edges. Answer: =30 and 150