A rectangular narrow U tube has equal arm lengths and base length each equal to...

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A rectangular narrow U tube has equal arm lengths and base length each equal to The vertical arms are filled with mercury up to 1 2 and then one end is sealed By heating the enclosed gas all the mercury is expelled If atmospheric pressure is Po the density of mercury is p and cross sectional area is S then Neglect thermal expansion of glass and mercury 50 A Work done by the gas against the atmospheric pressure is PS 2 7 B Work done by the gas against the gravity is S Spg C Work done by the gas against the atmospheric pressure is P SC D Word done by the gas against the gravity is Spg

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