Air, with a mass of 1.5 lbm, is initially at 2000°F. In a cooling process, the internal energy of the air is reduced by 350 Btu. Determine the final temperature of the air if
(a) the specific heat is considered constant, with its value taken at 2000°F,
(b) the specific heat is considered constant, with its value taken at 100°F, and
(c) the specific heat is considered to be variable.
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