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While passing a nearby pond, some students saw a drowning man screaming for help. They alerted another passerby who immediately threw an inflated rubber

tube in the pond. The man in the pond was saved.

(a) Why did the passerby use inflated rubber tube to save the drowning man?
(b) Name and write the principle involved.


A)because the R.D. of inflated tube is less than that of water because of presence of air and so it floats 

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