Q.

A beaker containing water is placed on the platform of a spring balance. The balance reads 15 N. A stone of mass 0.5kg and density 500 kg/m3 is kept fully immersed in water without touching the walls of beaker and held at rest. What will be the balance reading now? (g = 10 m/s2 )

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a

20 N

b

25 N

c

10 N

d

15 N

answer is A.

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Detailed Solution

Reading of weighing machine = weight of the liquid + buoyant force on body=15+0.5(10)=20N
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