A) 0.8g/cc
B) 2.8g/cc
C) 1.8g/cc
D) 0.28 g/cc
Correct Answer: B
Solution :
As the flask floats in water when less than half filled with water, it will float just fully submerged when half filled. In this situation, mass of flask + mass of water in it\[=V\sigma \] \[ie\],\[390+250=V\times 1\,\,(as\,\,\sigma =1g/cc)\] \[ie\], outer volume of flask \[V=640\,\,cc\] Now as inner volume of flask is given to be 500 cc, so the volume of the material of flask = 640 - 500 = 140 cc. But as mass of flask is 390 g, so density of material of flask \[\rho =\frac{m}{V}=\frac{390}{140}=2.8\,\,g/cc\]You need to login to perform this action.
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