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Buoyant Force

The reading o...

Question

The reading of a spring balance when a block suspended from it is air 60 newton. This reading changed to 40 newton when the block is fully submerged in water . The specific gravity of the block must be therefore:

A

3

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B

2

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C

6

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D

3/2

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Solution

The correct option is A 3
$R D = W_{a i r /} W_{a i r} - W_{w a t e r}$
$R D = 60 / 60 - 40$
$R D = 60 / 20 = 3$

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