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Question

The density of wood is X gcm3. Find [10X].{ Where , [] is a step function}

A
5
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B
6
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C
0
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D
7
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Solution

The correct option is D 6
Let the densities of water, wood and spirit are ρ,ρw,ρs
Let A be the area of the wooden block
Total volume of the wooden block =15A
Mass of wood = mass of water displaced by wood
V×ρw×g=A×10×ρ×g
ρw=A×10×ρ×gV×g =0.667g/cm3

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