pp. 230 - 232, Physics 3rd Ed. by Giancoli

4. Two cords support a chandelier in the manner shown in Fig. 9-5 except that the upper wire makes an angle of 45 degrees with the ceiling. If the cords can sustain a force of 1200 N without breaking, what is the maximum chandelier weight that can be supported?






7. Find the tension in the two wires shown in Fig. 9-46.






11. Calculate the forces F1 and F2 that the supports exert on the diving board of Fig. 9-44 when a 50-kg person stands at its tip. Ignore the weight of the board.






14. Calculate F1 and F2 for the beam shown in Fig. 9-48. Assume it is uniform and has a mass of 280 kg.





21. Consider a ladder of Example 9-6 (Fig. 9-11). If the coefficient of the static friction between the ladder and the ground is 0.40, how high up the ladder can a 58-kg painter climb without the ladder slipping? A free-body diagram is shown in Fig. 9-53. Note: Ladder is 5.0 m. long and weighs 12.0 kg.