A cylindrical metal can with a radius of 4.25 cm is floating upright in water. A rock is placed in the can, causing it to sink 0.0230 m deeper into the water. What is the weight of the rock?
The additional volume displaced is
pi r^2 (.023) = pi (.0425)^2(.023) =1.3*10^-4 m^3
density = 1000 kg/m^3
so mass of rock = .13 kg
so weight = mg = 1.28 Newtons