1. A 8.2 kg rectangular air mattress is 3.00 m long, 0.600 m wide, and 0.300 m thick. What mass

1. A 8.2 kg rectangular air mattress is 3.00 m long, 0.600 m wide, and 0.300 m thick. What mass can it support in water before sinking? DENSITY OF WATER IS 1000 Kg/m^3

2. A ferry boat is 2.0 m wide and 4.0 m long. When a truck pulls onto it, the boat sinks 2.00 cm in the water. What is the weight of the truck?DENSITY OF WATER IS 1000 Kg/m^3
3. An empty rubber balloon has a mass of 0.0220 kg. The balloon is filled with helium at 0°C, 1 atm pressure, and a density of 0.179 kg/m^3. The filled balloon has a radius of 0.700 m.
a. What is the magnitude of the buoyant force acting on the balloon? ( density of air= 1.29)
b. What is the magnitude of the net force acting on the balloon?


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