Question: a lifesaver device has an outer diameter of 75 cm...
A lifesaver device has an outer diameter of 75 cm and an inner diameter of 45 cm. Its total weight is 2 kg and it is used in water at 20 OC. Assuming, for simplicity, that the thickness of the life saver is constant at 12 cm.
a) Determine the maximum weight (in N) that the life saver can hold before it sinks.
b) Determine its force due to surface tension (in N) and discuss whether it significantly affects the force balance performed in a).