For items 9 to 11, refer to the following situation. A student pulls a 10 N block along a rough horizontal surface. The horizontal and the vertical components of the force that he applies are 4 N and 3 N, respectively. 9. What is the normal force? a. 3N C. 7N b. 4N d. 13 N 10. If the block is in an impending motion, what is the value of the maximum static friction a. 3N C. 7N b . 4 N d. 13 N 11. What is the coefficient of static friction? a. 0.31 C. 0.57 b. 0.4 d. 0.75 12. Two blocks of masses m, and m2, respectively, are connected by a string over a light pulley as shown in the figure to the right. When m,