Icebergs have an average density of 920 kg/m3. Seawater has an average density of 1030 kg/m3. An iceberg floats in seawater. What percentage of the iceberg's volume is in the air above the surface of the seawater? (A) 10.7% B 8.5% 12.0% (D) 17.0%

Ella’s boyfriend would like to make a very romantic wedding proposal. He decides to propose in a hot air balloon. He and Ella go to the spot where the hot air balloon will lift off the ground. Ella, who has taken physics, decides to do a few calculations to make sure they will be safe. The average density of the heated gas that will go in the hot air balloon is 0.96 kg/m3 . The basket and the propane tank weigh 1800N. The balloon fabric weighs 800N. Ella has a mass of 50kg and her boyfriend ha a mass of 65kg. The density of air is 1.23kg/m3 . a) What must be the minimum volume of the balloon in order to lift Ella and her boyfriend off the ground? b) If the volume of the balloon is 3 times what you found in part a, what is the net force on the basket that Ella and her boyfriend are in ?

The four tires of an automobile are inflated to a gauge pressure of 2.3 x 10° Pa. Each tire has an area of 0.025 m2 in contact with the ground. Determine the weight of the automobile.

A tube has a length of 0.045 m and a cross-sectional area of 5.9 x 10-4 m2. The tube is filled with a solution of sucrose in water. The diffusion constant of sucrose in water is 5.0 x 10-10 m2/s. A difference in concentration of 4.1 x 10-3 kg/m3 is maintained between the ends of the tube. How much time is required for 4.3 x 10-13 kg of sucrose to be transported through the tube?