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A wooden block of volume 1000 cc is suspended from a spring balance. It weighs 12 N in air. It is then held suspended in water with half of it inside water. What would be the reading in spring balance now?

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10N

answer is D.

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Detailed Solution

Apparent wt.
= Real wt.-Upthrust

$= 12 - \frac{1}{2} (1000 \times 10^{- 6}) \times 10^{3} \times 10 = 12 - 5 = 7 N$

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