Answers by visitors named: karuppaiah

Since the material is same, the density is also same. The formula for mass of the sphere m =Volume x density =4/3 (pi) (r)^3 x density m1= 160g, r1=8cm. r2=4cm, m2=? 160=4/3 (pi) (8)^3x density-----(1) m2=4/3 (pi) (4)^3x density-----(2) now equation (2)/(1) m2/160= (4)^3/(8)^3 m2=(4/8)^3 x 160 =160/8 =20 gm simple formula is m2=(r2/r1)^3 x m1