Question

A student presses a book between his hands, as the drawing indicates. The forces that he exerts on the front and back covers of the book are perpendicular to the book and are horizontal. The book weighs 34 N. The coefficient of static friction between his hands and the book is 0.34. To keep the book from falling, what is the magnitude of the minimum pressing force that each hand must exert?

Answer 1

for z book
to be at rest b/n z hand of student force friction must be equal to z weigh of book
f =w
f=ufn
fn=the force exeerts on book horizntaliy
fn=w/u
fn=34/.34
fn=100N