A man attempts to support a stack of books horizontally by applying a compressive force of...

A man attempts to support a stack of books horizontally by applying a compressive force of F = 120 N to the ends of the stack with his hands. If each book has a mass of 0.95 kg. determine the greatest number of books that can be supported in the stack. The coefficient of static friction between his hands and a book is (µs)h 0.6 and between any two books (µs)b = 0.4.