A cylinder contains 0.15 kg of hydrogen. The cylinder is closed by a piston supporting a weight of 74 kg (see fig.), n × 10 3 J amount of heat is given to lift the weight by 1.2 m ? The process should be assumed isobaric, the heat capacity of the vessel and the external pressure should be neglected. Find n (n is single digit.)
A cylinder contains 0.15 kg of hydrogen. The cylinder is closed by a piston supporting a weight of 74 kg (see fig.), n × 10 3 J amount of heat is given to lift the weight by 1.2 m ? The process should be assumed isobaric, the heat capacity of the vessel and the external pressure should be neglected. Find n (n is single digit.)
Text Solution
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Ans. 3
Sol. w = m w gh
Q = 
× m w gh
= 
× 74 × 9.8 × 1.2 ≈ 3 × 10 3 J
∴ n = 3
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