Explanation:
η = 1 - T₂/T₁: depends only on absolute temperatures, independent of working fluid or design. Universal maximum efficiency limit. Memory tip: 'Carnot: only T_hot and T_cold matter; real engines less efficient'. Thermodynamics concept frequently tested in competitive exams.
Explanation:
Rules: leading zeros not significant; trailing zero after decimal is significant. Digits 4,0,5,0 are significant ⇒ 4 sig figs. Memory tip: 'Start at first non-zero; include trailing zeros after decimal'. Measurement precision concept frequently tested in competitive exams.
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