Why is it easier to swim in sea water than in river water?
Fluids
Original Khojo Papers practice question — not from a past board paper.
1 N
No citable source has been recorded for this record. Treat it as practice material, not as fact.
The mass of water displaced = 100 cm3 × 1 g cm−3 = 100 g = 0.1 kg. Upthrust equals the weight of the displaced water = 0.1 × 10 = 1 N.
From the same topic and chapter, at a similar level.
Why is it easier to swim in sea water than in river water?
Fluids
State Archimedes' principle and the law of flotation.
Fluids
The relative density of a substance is 2.5. What is its density in kg m−3, and will it float on water?
Fluids
A force of 200 N acts normally on a surface of area 0.5 m2. Calculate the pressure.
Fluids
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.
Fluids
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.
Fluids