Why is it easier to swim in sea water than in river water?

A body weighs 50 gf in air and 30 gf when fully immersed in water. Find the upthrust, the volume of the body and its relative density.

A body of volume 200 cm³ is fully immersed in water. Calculate the upthrust on it. Take the density of water as 1 g cm⁻³ and g = 10 m s⁻².

State Archimedes' principle and the law of flotation.

The relative density of a substance is 2.5. What is its density in kg m⁻³, and will it float on water?

A force of 200 N acts normally on a surface of area 0.5 m². Calculate the pressure.

Calculate the pressure exerted at the bottom of a tank of water 5 m deep. Take the density of water as 1,000 kg m⁻³ and g = 10 m s⁻².