Question: A (950-mathrm{kg}) car uses an engine that operates on a Brayton cycle for which the pressure ratio is 8 and the working substance is helium

A $950-\mathrm{kg}$ car uses an engine that operates on a Brayton cycle for which the pressure ratio is 8 and the working substance is helium (He) gas. During each cycle, $25 \%$ of the work done by the engine is used to overcome friction. If the engine must accelerate the car from rest to $30 \mathrm{~m} / \mathrm{s}$, how much energy must be transferred thermally to the engine?

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