First slide

Pressure in a fluid-mechanical properties of fluids

Question

A silver ingot weighing 2.1 kg is held by a string so as to be completely immersed in a liquid of relative density 0.8. The relative density of silver is 10.5. The tension in the string in kg-wt is

Moderate

A

1.6
B

1.94
C

3.1
D

5.25

Solution

$Apparent weight = V (ρ - σ) g = \frac{M}{ρ} (ρ - σ) g$
$= M (1 - \frac{σ}{ρ}) g = 2 .1 (1 - \frac{0 .8}{10 .5}) g = 1 .94 gN$
$= 1 .94 Kg - wt$

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