1. The working substance for a Carnot cycle is 8 lb of air. The volume at the beginning of isothermal expansion is 9 cu ft and the pressure is 300 psia. The ratio of expansion during the addition of heat is 2 and the temperature of the cold body is 90°F. Find (a) Q, (b) QR, (c) V3, (d) P₁, (e) V₁, (f) p,, (g) pm, (h) the ratio of expansion during the isentropic process, and (i) the overall ratio of compression.