Page 44 - Pressure 10 class

An iceberg made up of water floats in water,why?

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Ans; The density of ice(0.917g/cm ) is less than that of water(1g/cm ).
Iceberg is able to displace water equal to its weight. Therefore,

iceberg floats in water.

A ship can carry more loads on sea water than on the river, why?

Ans; The density of salty water is more than that of fresh water. So, sea

water offers more upthrust to the ship than that of river water. As a

result, a ship can carry more loads on sea water than on river water.

Why does an iron nail sink in water but ship made of iron floats?

Ans; According to law of floatation, the object which displaces

liquid equal to its own floats in liquid. In case of an iron nail,

it has surface are. Due to this , the weight of water displaced by an

iron nail is less than the weight of the needle. So, it sinks in water.

In case of ship, it has very wide surface area. Due to this the weight

of water displaced by the ship is equal to the weight of the ship. So,

the ship floats in water.

July 30, 2020 Taranath Baral/GC Shiba/Suraj Thapaliya 44