일반물리학 1 — Equilibrium and Elasticity: Problem 28

28 In Fig. 12-34, a cord with negligible mass suspends a uniform ball against a frictionless vertical wall; the ball’s mass is 0.250 kg, its radius is 4.20 cm, and the vertical distance L between the ball’s center and the cord attachment on the wall is 8.00 cm. What are (a) the cord’s tension and (b) the magnitude of the normal force on the wall from the ball?