A glass flask weighing 390 g , having internal volume 500 cc just floats when half of it is filled with water. Specific gravity of the glass is

Step-by-step solution

If V   is the volume of water displaced, then mass of water displaced is, m = ρ w V Now, the mass of water displaced is equal to sum of mass of water in flask and mass of flask, therefore, ⇒ ρ w V = m f l a s k + ρ w 500 2 ⇒ 1 × V = 390 + 1 × 250 ⇒ V = 640   cm 3 Therefore, the volume of material of flask is, = V outer - V inner = 640 - 500 = 140   cm 3 Density of flask's material, ρ f l a s k = m V = 390 140 = 0 . 28   g   cm - 3 Specific