Problem 09.01 Mass, Density and Pressure (a) Determine the mass of the air in a balloon. Assume that the balloon is an ideal sphere with a radius of 15 cm. (b) Determine the mass of the same balloon if it were filled with () Helium and (ii) MercuryProblem 09.02 Hydrostatic pressure The Manana trench 1s located in the floor of the Pacific Ocean at a depth of about 11000 m below the surface. The average density of the seawater is 1030 kg m. (a) What 15 the pressure on the bottom of Manana trench? (b) If an underwater vehicle were to explore such a depth, what force would the water exert on the vehicle's observation window (r=0.10 m)