Answers

2016-03-08T20:56:17+05:30
This is having a specific reason ,this is due to Archimedes principle. Archimedes principle says that if a object having less weight then it will displace some water which is equal to the weight of the object .Here, the weight of the object is less because it is empty therefore it doesn't sink easily.

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2016-03-08T22:44:54+05:30
1- Because its relative density is less than 1 i.e. less than water so it floats.
2- Because of Buoyant force.
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of course the mass is related to density.