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A closed system contains 2 kg of air at 3 bar, 150ºC. It is stirred, and expands

till its pressure reduces to 1 bar. Du

By Iris

A closed system contains 2 kg of air at 3 bar, 150ºC. It is stirred, and expands

till its pressure reduces to 1 bar. During the process, the temperature of the

system is maintained constant at 150ºC. If the stirrer does 120 kJ of work,

determine (i) expansion work done and (ii) heat transferred. Assume

R = 287 J/kg.K for air.​

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Iris

4. If two zeroes of the polynomial r-6r-26r? + 138x – 35 are 2 + 73, find other zeroes.
​

Verify that × ( + ) = × + × by taking = −2, = − 2
3
, = −
3

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  1. Answer:

    It is stirred, and expands till its pressure reduces to 1 bar. … system is maintained constant at 150ºC. If the stirrer does 120 kJ of work, determine (i) expansion work done and (ii) heat transferred.

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