While passing by a pond, some students saw a drowning man sereaming for help. They alerted another passer by, who immediately threw an inflated rubber tube in the pond. The man was saved.
(i) Why did the passer-by use inflated rubber Lube to save the drowning man?
(ii) Write the principle involved here.
(iii) The density of turpentine is 840 kg m`""^(-3)`. What will be its relative density ? (Density of water is 1000 kg m`""^(-3))`.

Explanation

The inflated ruber tube has more volume as compared to its mass. So, the density of rubber tube is less than that of water. With the help of this rubber tube, the drowning person can keep himself floating.
(ii) Archimedes. principle is involved.
(iii) The relative density of turpentine `=("Density of turpentine")/("Density of water")`
`=(840kg//ms^(3))/(1000kg//m^(3))=0.84`
The relative density of terpentine is 0.84.