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Required informetion

Problem $10\mathrm{.}089$E $-$ Simple Ideal Brayton Cycle with Variable Specific Heats in Imperial Units

A simple ideal Brayton cycle with air as the working fluid has a pressure ratio of $10.$ The air enters the compressor at $520$ R and the turbine at $2,200$ R$.$ Account for the variation of specific heats with temperature. Use data from the tables containing the ideal gas properties of air.

Problem $10\mathrm{.}089$E$.$b $-$ Bock work ratio for a ideal Brayton Cycle

Determine the back work ratio,

The back wark ratio is $$