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Q.

Three identical blocks each of mass m=1kg and volume 3×104m3 are suspended by mass less strings from a support as shown. Underneath are three identical containers containing the same amount of water that are placed over the scales in Fig(1), the block is completely out of the water; in fig.(2), the block is completely submerged but not touching the beaker and in fig.(3), the block rests on the bottom of the beaker. The scale in Fig.(1) reads 14N.

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a

The reading of the scale in (3) is 24N

b

The reading of the scale in (2) is 17N.

c

The tension in the string in (2) is 10N.

d

The tension in the string in (2) is 7N.

answer is B, C, D.

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Detailed Solution

Density of the block =13×104kg/m2

=103×103kg/m3

Buoyant forceB=3×104×103×10

=3×104×104 =3N

Reading of B=14+3=17N

Reading of C=14+(103)+3

=24N

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