First slide

Fluid statics

Question

A U-tube contains water and methylated spirit separated by mercury. The mercury columns in the two arms are in level with 10.0 cm of water in one arm and 12.5 cm of spirit in the other. What is the specific gravity of spirit.

Moderate

A

0.8
B

1.8
C

2.2
D

0.4

Solution

$\large h_wd_wg=h_sd_sg;d_s=\frac {h_wd_w}{h_s}=\frac {10\times 1}{12.5}=0.8gmcm^{-3}$
$\large R_{d_s}=\frac {d_s}{d_w}=\frac {0.8}{1}=0.8$

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