The specific heat of air at constant pressure is 1.005 kJ/kg K and the specific heat of air at constant volume is 0.718 kJ/kgK. Find the specific gas constant.

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0.21 kJ/kg K

0.19 kJ/kg K

0.34 kJ/kg K

0.287 kj/kg K

answer is A.

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Detailed Solution

$\begin{array}{l} C_{p} = 1 .005 kj / kg - k; C_{v} = 0 .718 kj / kg - k \\ C_{p} - C_{v} = r \Rightarrow r = 1 .005 - 0 .718 \\ = 0 .287 kj / kg - k \end{array}$

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