PRACTICE IT Use the worked example above to help you solve this problem. A sturdy balloon with volume 0.555 m³ is attached to a 2.85 x 102-kg iron weight and tossed overboard into a freshwater lake. The balloon is made of a light material of negligible mass and elasticity (though it can be compressed). The air in the balloon is initially at atmospheric pressure. The system fails to sink and there are no more weights, so a skin diver decides to drag it deep enough so that the balloon will remain submerged. (a) Find the volume of the balloon at the point where the system will remain submerged, in equilibrium. Your response differs from the correct answer by more than 10%. Double check your calculations. m³ (b) What's the balloon's pressure at that point? Your response differs from the correct answer by more than 10%. Double check your calculations. Pa (c) Assuming constant temperature, to what minimum depth must the balloon be dragged? × Your response differs from the correct answer by more than 100%. m EXERCISE HINTS: GETTING STARTED | I'M STUCK! A boy takes a 31.0 cm³ balloon holding air at 1.00 atm at the surface of a freshwater lake down to a depth of 4.45 m. Find the volume of the balloon at this depth. Assume the balloon is made of light material of little elasticity (though it can be compressed), and that the temperature of the trapped air remains constant. cm³ Need Help? Read It