A) 80 Kg
B) 50 Kg
C) 60 Kg
D) 30 Kg
Correct Answer: A
Solution :
Volume of log of wood \[V=\frac{\text{mass}}{\text{density}}=\frac{120}{600}\]=0.2 m3 Let x weight that can be put on the log of wood. So weight of the body = \[(120+x)\times 10\ N\] Weight of displaced liquid = \[V\sigma g=0.2\times {{10}^{3}}\times 10\ N\] The body will just sink in liquid if the weight of the body will be equal to the weight of displaced liquid. \ \[(120+x)\times 10=0.2\times {{10}^{3}}\times 10\] \[\Rightarrow \ 120+x=200\] \ x = 80 kg
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