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Physics - Heat & Thermo Question with Solution | TestHub

PhysicsHeat & ThermoKinetic Theory of Gases and Gas LawsHard2 minQB

PhysicsHardnumerical

A mercury column 20 cm long sits in the middle of a horizontal tube of length 100 cm closed at both ends, with air at 76 cm of Hg on each side. The tube is turned vertical. Find the distance the column moves in cm (nearest 0.1 cm). The temperature is constant and the air columns are each 40 cm long at the start.

Answer:

5.20

Solution:

The column moves down $x$ . Lower air: $P_{l} = \frac{76 \times 40}{40 - x}$ . Upper air: $P_{u} = \frac{76 \times 40}{40 + x}$ . Balance $P_{l} - P_{u} = 20$ gives $x = 5.2$ cm.

Subject:PhysicsTopic:Heat & ThermoSubtopic:Kinetic Theory of Gases and Gas Laws

⏱ 2mℹ️ Source: QB

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