# Selina Solutions Class 9 Physics Solutions for Exercise 5C in Chapter 5 - Chapter 5 Upthrust In Fluids Archimedes Principle And Floatation

Question 17 Exercise 5C

A man first swims in sea water and then in river water.

(i) Compare the weights of sea water and river water displaced by him.

(ii) Where does he find it easier to swim and why?

(i) The weight of the water displaced is equal to the weight of the man in both cases, when

he swims in seawater and in river water, hence the comparison yields 1:1.

(ii) The man will find it easier to swim in seawater as the density of seawater is

more than that of the river water. Therefore, his weight is balanced in seawater with a lesser part of his immersed inside it

Video transcript
"hello everyone welcome to leader learning i am gurpreet your science tutor today's question is a man first swims in sea water and then in the river water compare the weights of sea water and river water displaced by the him and secondly where does he find it easier to swim and why so let us start our answer if we talk about the first part that is you have to compare the weight of sea water and the river water displaced by the man so here weight of water displaced is equal to weight of man in both the cases that is in sea water as well as in river water when he swims in water sea water and in river water his comparison aids one is to one because the weight displaced here is equal to the weight of man and for the second part that is b part where does he find it easier to swim and why the man find to swim easier to swim easier in sea water as the density density of sea water is more than that of river water due to this his weight is balanced is balanced in sea water with a lesser part of body okay so this is why he finds easier to swim in sea water for more such videos please subscribe leader learning and for any doubts drop a comment thank you"
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