9. A body of density
d1 is counterpoised by of weights of density d2 in air of density d. Then the true mass of the body is
(a) M (b) M[1-( d – d2 )]
(c) M[1-( d – d1 )] (d)M[1-( d – d2 )] / [1-( d – d1 )]
Answer-d
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(a) – 5 J (b) – 10 J (c) – 15 J (d) – 20 J Answer-a