Astudent 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 32.9 n. the coefficient of static friction between his hands and the book is 0.416. to keep the book from falling, what is the magnitude of the minimum pressing force that each hand must exert?

Athin nonconducting rod with a uniform distribution of positive charge q is bent into a circle of radius r. the central perpendicular axis through the ring is a z-axis, with the origin at the center of the ring. a) what is the magnitude of the electric field due to the rod at z = 0? n/c (b) what is the magnitude of the electric field due to the rod at z = infinity? n/c (c) in terms of r, at what positive value of z is that magnitude maximum? r (d) if r = 4.00 cm and q = 9.00 µc, what is the maximum magnitude? n/c