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A steam engine delivers 7.5 × 10^8 J of work per minute and services 3.6 × 10^9 J of heat per minute

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A steam engine delivers 7.5 × 108 J of work per minute and services 3.6 × 109 J of heat per minute from its boiler. What is the efficiency of the engine? How much heat is wasted per minute? Also And the ratio of temperature of sink to the source.

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η = P0/P1

η = 0.21 

P0 = Pi = 47.5 MW

η = 1 - T1/T2

T1/T2 = 0.79

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