An ideal gas is taken through a cyclic thermodynamic process through four steps. The amounts of heat given to the system in thes
e steps are Q{1} = 1000J, Q{2} = - 800J, Q{3} = 450J , Q{4} = - 200 J respectively. The efficiency of cycle is nearly
Need full Explanation ! Answer is already marked in attachment just need the explanation or the way to reach the answer . 
Need full Explanation ! Answer is already marked in attachment just need the explanation or the way to reach the answer .
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Answer:
Local atmospheric pressure in kPa = 97.932 kPa
Local atmospheric pressure in mm Hg = 734.78 mm Hg
Explanation:
Given:
= absolute pressure = 46 kPa = 46000 kPa
= density of air =
= density of mercury =
= altitude of the plane = 6400 m
Assume:
= pressure decrease due to air at height h
= local atmospheric pressure
As we go up the altitude, the pressure decreases. So, the reading of the pressure will be equal to the decrease in pressure due to height subtracted from the local atmospheric pressure.
Now, conversion of the local atmospheric pressure is quite simple. let us assume that height of H mm of Hg is required to exert a pressure equivalent to the local atmospheric pressure.
Hence, 734.78 mm Hg is the local atmospheric pressure in mm Hg.