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A wooden block floating in a bucket of w...

A wooden block floating in a bucket of water has 4/5 of its volume submerged. When certain amount of an oil is poured into the bucket, it is found that the block is just under the oil surface with half of its volume under water and half in oil. The density of oil relative to that of water is

A

0.7

B

0.8

C

0.5

D

0.6

Text Solution

Verified by Experts

The correct Answer is:
D
Initially `(4)/(5) V rho omega g = mg`
After pouring of oil `mg = rho omega (V)/(2) g + rho_(0) (V)/(2) g`
`(rho omega)/(2) + (rho_(0))/(2) = (4)/(5) rho omega`
`(rho_(0))/(2) = rho omega [(4)/(5) - (1)/(2)]`
`(rho_(0))/(2) = rho omega [(8 - 5)/(10)], rho_(0) = (3)/(5) rho omega`
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