Answers to even questions in Chapter 9. Notify me of any disagreement. 2. The minimum diameter for the wire is 6.89 mm. 4. The minimum diameter for the wire is 1.3 mm. 6. The shear stress on the crustal plate is 7.5*10^6 Pa. 8. a) The elongation of the cable is 2.45 mm. b) The additional length increase is 0.75 mm. c) The maximum mass is 6.9*10^3 kg. 10. The weight of the automobile is 1.9*10^4 N. 12. The tallest cylindrical concrete pillar without collapse is 3.4*10^2 m. 14. The minimum height of the glucose solution must be 1.33 m. 16. See solution. 18. The force, F, needed to support a 500-lb weight is 2.31 lb. 20. The mass of the frog is 0.611 kg. 22. The fraction of an iceberg exposed in seawater is 0.11. 24. The elongation of the spring is 16.5 cm. 26. a) The density of the object is 8.57*10^3 kg/m^3. b) The density of the oil is 714 kg/m^3. 28. The depth of the bottom end of the tube is 15.9 cm. 30. The equilibrium readings on the scales are 17.3 N (top) and 31.7 N (bottom). 32. The time to fill the trough is 13 min. 34. The upthrust on the wing is 1.5*10^5 N. 36. The flow speed of the medicine in the needle is 12.6 m/s. 38. The height of water in the tank is 9.00 cm. 40. The inside diameter at the constriction is 1.5 cm. 42. a) See solution. b) The siphon will work for y < P_atm/rho*g. 62. a) The flow speed in the narrow section is 16.0 m/s. b) The pressure in the narrow section is 1.73*10^5 Pa. 64. The volume of helium required in the balloon is 4.14*10^3 m^3. 66. The magnitude and direction of the force on the tooth are 22 N downwards. 68. The depth of the oil layer is 1.3 cm. 70. a) See solution. b) The electric power produced by each unit is 616 MW. 72. The maximum height attained by the water stream is 2.3 m. 74. Tha maximum height the ball rises to above the water is 6.3 m. 76. The height of water in the tank is 17.0 cm above the bottom. 78. The volume of ethanol added is 532 cm^3.