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Physics

Fluid-Mechanics

Easy

Question

A vessel with water is placed on a weighing pan and reads 600 g. Now a ball of 40 g and density 0.80 g / cc is sunk into the water with a pin as shown in fig. keeping it sunk. The weighing pan will show a reading

600 g
550 g
650 g
632 g

The correct answer is: 650 g

Upthrust on ball = weight of displaced water
$equals V sigma g equals open parentheses m over rho close parentheses sigma g equals fraction numerator 40 over denominator 0.8 end fraction cross times 1 cross times g equals 50 g$
= weight of water + downward force against upthrust =600+50=650 gm

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