Question

answer ques 1 n 2........

Answer 1

your mass will be less than 42 kg because the weighnng machine doesnt consider the gravitational force

weight depents on various factors

Answer 2

Answer for 1 is pinned with this answeer

Ans. 2) In actual cotton bag is heavier because
$because \: cotton \: bag \: displaces \: more \: air \: than \: iron \: bar \: which \: gets \: a \: equal \: upthrust \: therefore \: cotton \: bag \: is \: more \: hevy \: in \: actual \: but \: by \: a \: very \: little \: amount$