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1. The problem statement, all variables and given/known data

A mercury barometer of height 1.000m has some ideal gas trapped inside. When the tube is vertical, the height of the mercury column is 0.700m. When the tube is inclined at an angle of 30 degrees to the horizontal, the length of the mercury is 0.950m.

Assuming temperature is constant, the atmospheric pressure, in mm Hg, is ?

(a picture of the question is attached)

Answer: 745mmHg

2. Relevant equations

Pressure = hpg

3. The attempt at a solution

I tried working it along this line whereby Atmospheric Pressure = Pressure of the ideal gas(hpg) + Pressure of vertical length of Mercury .

Formed 2 simultaneous equations with the 2 diagrams as attached. But no luck in getting the answer so far. Please tell me whether the direction that im going at is correct.

Thanks in advance :D

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# Homework Help: Pressure (Barometer)

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