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Q.

A beaker containing water is kept on a spring scale. The mass of water and beaker is 5 kg. A block of mass 2 kg and specific gravity 10 is suspended by means of thread from a spring balance as shown. The readings of scales S1 and S2 are respectively [Take g=10 ms-2 ].

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a

 52 N and 20 N

b

50 N and 18 N

c

52 N and 18 N

d

52 N and 22 N

answer is C.

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Detailed Solution

Upthrust =210×1×10=2 N

Reading of S1 will increase by 2 N while that of S2 will decrease by 2 N.

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