1In which liquid is the weight of the stone least when it is immersed in water, glycerin and cooking oil?
2Why does an egg sink in tap water but float in salt water?
3Why is it easier to swim in seawater than in river water?
4The same ship sinks less deep in seawater than in river water. Give the reason.
5Once an object is fully immersed in water, why does taking it deeper not increase the upthrust?
6An aluminium cube (2.7 g/cm³) and a steel cube (7.8 g/cm³) of equal volume are fully immersed in water. Which one feels more upthrust?
7State Archimedes' principle.
8How is Archimedes' principle verified using a eureka can?
9Show how the formula U = Vρg follows from Archimedes' principle.
10A metal block of volume 0.0005 m³ is fully immersed in water. If the density of water is 1000 kg/m³ and g = 9.8 m/s², find the upthrust on it.
11An object weighs 25 N in air and 17 N when fully immersed in water. Find the upthrust and the weight of the water displaced.
12Why does it take more force to push a large watertight plastic bottle under water than a small one?