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A mercury filled manometer with two unequal length arms of the same cross-sectional area is sealed
off with the same pressure Po in the two arms (see figure below). With the temperature constant,
an additional 10 cm³ of mercury is admitted through the valve at the bottom. The level on the left
increases by 6 cm and the level on the right increases by 4 cm. Find the pressure Po.
50 cm
Po
WH
Ø
30 cm

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