Question

Explain the following :

(a)Swimmers are provided with an inflated rubber jacket / tube. why?

(b)It is easier to swim in sea water than in river water. why?

Answer 1

(a) Swimmers are provided with an inflated rubber jacket or rubber tube. The jacket tube has low weight and large volume. Hence, it displaces large volume of water. As a result, up thrust due to water increases and the person remains floating i.e., there is no chance of drowning of the swimmer in such case.
(b) It is easier to swim in sea water because density of sea water is more due to its salty nature. Hence, up thrust acting on the swimmer in sea water is more in case of sea water than in fresh water. So, it is easier to swim in sea water