Q6 of 25 Page 137

Why some objects float on the water? And some sink?

According to Archimedes' principle Floating or sinking of an object does not depend on its weight (Mass), it depends upon its density. Things denser than water sink in water whereas things having less density than water float over it.



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4

The volume of 50g of a substance is 20 cm3. If the density of water is 1g/cm3,will the substance sink or float when placed on the surface of water ? What will be the mass of water displaced by the substance?

 5

Find the pressure at a depth of 10m in water if the atmospheric pressure is 100kPa. [1Pa=1N/m2 ] [100kPa = 105Pa = 105N/m2 = 1 atm.]

 7

Explain density and relative density and write formulae.

 8

What is the value of density of water?