A certain watch is rated to withstand a depth of 50 meters in water before it is crushed. Assuming the density of water is 1000 kg/m^3,

* what is the pressure of the water at that depth
* if the water cover has a surface area of 2cm^2, what is the force of water on the cover?



A rather careless ice fisherman drives his 500kg ATV onto a block of ice. Fortunately, he got off before it floated away. Assuming the density of ice is 900 kg/m^3, and the density of cold water is 1000 kg/m^3,

a) what is the minimum mass of ice necessary to float the 500kg ATV, and
b) if the ice is 20cm thick, what is the surface area of the ice?