I. MULTIPLE CHOICE Choose the letter of the best answer. For items 9-10. A cylindrical object with a base diameter of 20 cm was placed at the top of a 2 em-thick wooden plate. 9. If the object causes a normal stress of 0.03 N/cm2 to the surface of the plate, what would be its weight? * O a. 10 N O b. IN O C. 12 N O d. 6 N 10. What is the shear stress caused by the object? * O a. 0.8 N/cm2 O b. 6 N/cm2 O c. 10 N/cm2 O d. None of the choice